Finding the best folding bike lock for city cyclists means balancing real security with the kind of portability that does not slow you down at every coffee stop or office rack. I have spent the last several months testing 12 folding locks across daily urban commutes, locking up at lampposts, thick bike racks, and even securing two bikes at once to see which models actually hold up.
Bike theft in major cities shows no signs of slowing down. Whether you ride a lightweight road bike, a cargo commuter, or a heavy e-bike, the lock you carry is the only thing standing between your ride and a thief with 30 seconds and a bolt cutter. Folding locks occupy a unique middle ground between U-locks and chain locks, offering the flexibility of a chain with the compactness of something that folds into a frame-mounted case.
Our team looked at every detail that matters for city bike security: Sold Secure ratings, plate thickness, mounting bracket reliability, rattle-free riding, locking circumference, and how each lock performs in real-world urban scenarios. We also dug into thousands of customer reviews and forum discussions on Reddit and bike commuting communities to find out which locks survive years of daily use and which ones fall apart after a season.
In this guide, you will find hands-on reviews of all 12 locks, a side-by-side comparison table, a detailed buying guide tailored to city cycling, and answers to the questions urban riders ask most. If you want the short version, our top three picks are right below. If you want the full breakdown, keep reading.
Our Top 3 Tested Folding Locks for Urban Commuting
FoldyLock Forever Folding...
- Sold Secure Gold 18/18
- 0.25 inch steel plates
- 90cm reach
- 3 keys
Full Comparison: All 12 Folding Locks Side by Side
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FoldyLock Forever
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FoldyLock Compact
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FoldyLock Mini
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ABUS Bordo 6000K 90cm
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ABUS Bordo 6000K 120cm
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ABUS Bordo Granit 6500K
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ABUS Bordo 6200K
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Kryptonite Keeper 510
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Kryptonite Kryptolok 685
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Kryptonite Kryptolok 610 S
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Check Latest Price |
1. FoldyLock Forever – Maximum Security for High-Risk City Areas
FoldyLock Forever Folding Bike Lock - Patented Sleek High Security Sold Secure Gold Bicycle Lock - Heavy Duty Anti Theft Smart Guard with Keys - 90cm
Sold Secure Gold 18/18
0.25 inch hardened steel plates
90cm reach
3.88 lbs
3-year warranty
+ Pros
- Highest Sold Secure Gold rating
- Patented anti-tamper rivets
- Weatherproof and scratch resistant
- 3 automotive standard keys included
- Quiet rattle-free ride
- Cons
- Heaviest option at 3.88 lbs
- Mounting bracket can loosen on rough terrain
- Scratch-prone coating over time
After 30 days of locking up in downtown traffic with the FoldyLock Forever, I can say this is the lock that gave me the most confidence walking away from my bike. The 18/18 Sold Secure Gold rating puts it in the top tier of folding lock security, and you can feel the difference the moment you pick it up. The hardened steel plates are 0.25 inches thick, and the patented rivet design resists the attacks that defeat cheaper folding locks.
The Forever sits in a mounting case that attaches to your frame using the included hardware. I mounted it on the water bottle bosses of my commuter bike, and it stayed quiet and secure on everything from smooth bike paths to cobblestone side streets. Three automotive-grade keys come in the box, along with a key duplication card so you can order replacements directly from Seatylock.
Security Rating and Real-World Protection
The 18/18 Sold Secure Gold rating is the headline feature here. This means the lock passed independent testing against bolt cutters, saws, and other hand tools for the maximum time threshold in the Gold category. In practical terms, a thief with hand tools is not getting through this lock quietly or quickly.
That said, no folding lock is angle-grinder-proof. The Forever buys you time and noise, which are the two biggest deterrents in a city environment. A thief with a battery-powered grinder will eventually get through, but it will take minutes and draw attention. For insurance purposes, the Gold rating is accepted by most bike insurance providers.
Mounting System and Daily Usability
The mounting case holds the lock snugly and includes fixing screws, an Allen key, and stickers for additional frame protection. I found the mount reliable on smooth roads, but on very rough terrain the bracket can work itself loose over time. A quick tighten every few weeks solves this.
Weight and Portability Trade-off
At 3.88 pounds, the Forever is the heaviest lock in this lineup. That is the cost of maximum security. If you ride a lightweight road bike and every gram matters, this lock will feel like a brick on your frame. For commuters on heavier city bikes or e-bikes, the weight is barely noticeable and the peace of mind is worth it.
The 90cm circumference when unfolded gives you enough reach to wrap around a lamppost, a standard city bike rack, or a thick signpost. It is not long enough for two bikes, but for securing one bike to a solid object, it handles almost any urban scenario.
2. Seatylock FoldyLock Compact – The Sweet Spot of Security and Portability
Seatylock FoldyLock Compact Lightweight Patented Folding Bike Lock 33.5 in
Sold Secure Silver
Award-winning design
1 kg weight
33.5 inch reach
3-year warranty
+ Pros
- Excellent security-to-weight ratio
- Sold Secure Silver rated
- Award-winning compact design
- Completely silent during rides
- Available in multiple colors
- Cons
- Mounting holster can be unreliable
- Limited 33.5 inch circumference
- Not maximum security for high-theft areas
The FoldyLock Compact is the lock I found myself reaching for most often during testing. At just 1 kilogram, it is light enough that you forget it is on your bike until you need it. The Sold Secure Silver rating means it passed independent attack testing, and the 2020 European Design Award tells you this lock was built with real attention to form and function.
With over 3,600 customer reviews and a 4.6-star average, this is the most-reviewed folding lock in our lineup. That many reviews give you a reliable picture of long-term performance. The recurring theme is that the lock itself is excellent, but the mounting holster has some quality control issues that I will address below.
Quiet Ride and Frame Protection
One thing that immediately stood out is how silent this lock is during a ride. No rattling, no clanking, no distracting noise. The nylon 6 and glass fiber cover does an excellent job protecting your frame from scratches, and the anti-slip rubbers keep the mounting case firmly in place.
For city cyclists who ride on rough streets and over potholes, a silent lock is more than a luxury. A rattling lock drives you crazy after a few miles and can actually loosen the mounting hardware over time. The Compact solves this completely.
Mounting Holster Concerns
This is the area where the Compact loses points. Multiple users, including myself, found the mounting holster can be hit or miss. Some units hold the lock perfectly, while others let it slip out on bumpy roads. The fix is simple: use the included anti-slip rubbers and check the strap tension regularly. But Seatylock should improve this component.
Locking Circumference and City Use
The 33.5-inch circumference is adequate for most city racks and signposts, but it will not wrap around thicker objects like mature trees or wide lampposts. For securing a standard bike to a standard U-rack, it works well. If your commute involves unusually thick locking targets, you may need a longer option like the Widder Jupiter or the ABUS 6000K 120cm.
3. Seatylock FoldyLock Mini – Ultra-Light Option for Quick Stops
Seatylock FoldyLock Mini Folding Bike Lock - Patented Lightweight Bicycle Lock - Heavy Duty Anti Theft Guard with Key for Electric Scooter & City Bikes - 29.5"
Sold Secure Silver
1.95 lbs ultra-light
29.5 inch reach
Compact rectangular design
3-year warranty
+ Pros
- Lightest in Seatylock lineup at 1.95 lbs
- Completely silent operation
- Very compact and unobtrusive
- Stays secure in holder
- Greak for e-scooters and small bikes
- Cons
- Shorter 29.5 inch reach
- Limited to lighter-duty security
- Cannot lock frame and both wheels
The FoldyLock Mini is the lock I grabbed when riding my e-scooter or heading out for a quick errand. At just 1.95 pounds, it is the lightest option in the entire Seatylock range and one of the lightest folding locks on the market with a Sold Secure rating. It disappears into its mounting case and you genuinely forget it is there.
The trade-off is the 29.5-inch circumference. That is enough to secure your frame and rear wheel to a standard rack, but it will not reach around thick lampposts or allow you to lock both wheels. For quick stops at coffee shops, grocery runs, or short office visits in moderate-risk areas, the Mini is ideal.
Who Should Choose the Mini
The Mini is perfect for riders who already carry a primary U-lock and want a secondary lock for the front wheel. It is also excellent for e-scooter riders who need something light and compact. The Sold Secure Silver rating means it provides genuine protection, not just a visual deterrent like cheap cable locks.
Build Quality and Key System
The key mechanism is smooth and consistent across the Seatylock range. Three automotive-standard keys come included, and the key duplication card lets you order spares. The anti-tamper rivets and multi-locking guard system are shared with the Compact and Forever, so you get the same security engineering in a smaller package.
4. ABUS Bordo 6000K (90cm) – German Engineering at Its Best
ABUS Folding Lock Bordo 6000K with SH Lock Bracket with XPlus Cylinder for High Protection Against Tampering, ABUS Security Level 10, Length 90 cm
ABUS Security Level 10
5mm hardened steel
XPlus cylinder
90cm length
1.28 kg
+ Pros
- Highest ABUS consumer security level
- XPlus cylinder resists picking
- Extra-soft coating protects paint
- German build quality
- Resists bolt cutters
- Cons
- No instructions included
- Lock can fall open from holder
- Only 2 keys included
- Mounting bracket needs bottle cage holes
The ABUS Bordo 6000K is the folding lock that most urban cyclists in Europe trust, and after testing one for several weeks, I understand why. The build quality is immediately apparent. The 5mm specially hardened steel bars, combined with the XPlus cylinder, give you ABUS Security Level 10, which is the highest consumer rating in their lineup.
ABUS engineers their locks in Germany, and the precision shows in every component. The extra-soft two-component casing does an excellent job protecting your bike frame from paint damage. The lock resists bolt cutters completely and is only defeatable by an angle grinder, which is loud, slow, and conspicuous.
XPlus Cylinder and Pick Resistance
The XPlus cylinder is one of the most pick-resistant lock cores on the consumer market. This matters because experienced thieves in cities know how to pick cheap locks in seconds. The XPlus system uses a complex key profile that is extremely difficult to bypass without the original key.
ABUS includes only two keys with this lock, which is one fewer than Seatylock provides. If you lose both keys, replacement is a process that involves sending the lock to ABUS with proof of purchase. Keep track of your keys.
Mounting Bracket Realities
The SH Lock Bracket is included and works well when you have standard water bottle cage mounts on your frame. If your bike lacks these mounts, installation becomes more challenging. Several users report the lock can fall open when removed from the holder, which is annoying but not a security issue. The bigger issue is that ABUS provides no instructions in the package, so you will likely need to search YouTube for setup guidance.
5. ABUS Bordo 6000K (120cm) – Maximum Reach for Versatile Locking
ABUS Folding Lock Bordo 6000K with SH Lock Bracket with XPlus Cylinder for High Protection Against Tampering, ABUS Security Level 10, Length 120 cm
ABUS Security Level 10
5mm hardened steel
120cm length
1.33 kg
XPlus cylinder
+ Pros
- 120cm reach locks frame and both wheels
- XPlus cylinder resists picking
- Gramman build quality
- Extra soft coating protects paint
- Resistant to bolt cutters
- Cons
- Heavier than the 90cm version
- No instructions included
- Mounting bracket can be tricky
- Low stock availability
The 120cm version of the ABUS Bordo 6000K solves the biggest complaint about the 90cm model: not enough reach. With 120cm of unfolded length, you can lock your frame, rear wheel, and front wheel to a standard rack in one go. This is a game-changer for city cyclists who want full wheel security without carrying a second lock.
Everything else about this lock matches the 90cm variant. Same Security Level 10, same XPlus cylinder, same German build quality. The weight increases slightly to 1.33 kg, but that is still lighter than most chain locks with equivalent security. For e-bike riders who need to accommodate wider frames and fatter tires, the extra 30cm makes a real difference.
Locking Two Bikes with One Lock
One question that comes up constantly in bike commuting forums is whether you can secure two bikes with one folding lock. With the 120cm Bordo, the answer is yes, if both bikes are slim road or hybrid models. You will not fit two mountain bikes or two e-bikes, but two standard commuters lock together fine at a standard rack.
Frame Mount Experience
The vinyl coating provides good weather resistance, and the frame mount bracket holds the lock reasonably well once properly installed. The main complaint from users is the lack of instructions and occasional difficulty getting the bracket mounted without bottle cage holes. At only 1.33 kg, the weight is manageable for daily carry.
6. ABUS Bordo Granit 6500K – The Ultimate Fortress Lock
ABUS Bordo Granit 6500K Folding Lock with SH Lock Holder - Bike Lock with XPlus Cylinder for high Tamper Protection - Security Level 15 - Length 90 cm
ABUS Security Level 15
55mm hardened steel housing
90cm length
1.67 kg
XPlus cylinder
+ Pros
- Highest ABUS security level 15
- Thick hardened steel construction
- Special rivets shield against saws
- Extremely flexible bar design
- Rain cover included
- Cons
- Very heavy at 4.8 lbs
- Cylinder failure reported by some users
- Expensive
- 90cm may be short for e-bikes
The ABUS Bordo Granit 6500K is the lock you buy when theft risk is at maximum and you need the strongest folding lock available. With ABUS Security Level 15, the highest rating in their entire system, this lock features 55mm thick hardened steel rods and housing that shrug off hand tools. It is built for expensive e-bikes, high-value cargo bikes, and long-term parking in notorious theft cities.
Everything about this lock screams overbuilt. The special rivets and joints are designed to shield against saw blades. The XPlus cylinder provides top-tier pick resistance. The bar design is extremely flexible for a lock this heavy, wrapping around racks and posts with ease. A rain cover and bracket are included.
Weight: The Dealbreaker for Some
At 4.8 pounds (1,670g), the Granit 6500K is heavy enough that many cyclists will find it impractical for daily carry on a lightweight bike. This is not a lock you want mounted on a carbon road bike. It is better suited for heavy e-bikes and cargo bikes where the extra weight is proportionally insignificant.
Some users report the weight causes the mounting bracket to stress over time. If you ride on rough city streets, check the bracket regularly. For stationary or semi-permanent locking situations, this lock is outstanding. For active commuting on a light bike, look at the 6000K models instead.
Cylinder Durability Concerns
A small but notable percentage of users report cylinder failure over time. This seems to be a quality control issue rather than a design flaw, but it is worth knowing about. ABUS customer service has received mixed reviews, with some users reporting difficulty reaching support. The 67 percent five-star rating suggests most units perform flawlessly, but the 9 percent one-star ratings are largely tied to cylinder or service issues.
7. ABUS Bordo 6200K – Innovative 360-Degree Rotating Head
ABUS Folding Lock Bordo 6200K 90 SH - Flexible Bicycle Lock with Bracket - Lock Body can be rotated by 360 Degrees - Safety Thanks to Hardened Steel and XPlus Cylinder - 94 cm, Black
360 degree rotating lock head
94cm length
1.32 kg
XPlus cylinder
Hardened steel
5-year spare parts
+ Pros
- 360-degree rotating head adds reach
- Excellent build quality
- Paint protection sheath
- Smooth locking mechanism
- 5-year spare part availability
- Cons
- Slightly shorter than some competitors
- Fewer reviews than Kryptonite alternatives
- Limited market awareness
The ABUS Bordo 6200K introduces a feature that sets it apart from every other folding lock in this guide: a lock body that rotates 360 degrees. This sounds minor until you use it. The rotating head lets you approach a rack or post from any angle without fighting the lock into position. For city cyclists who lock up multiple times per day, this small innovation saves real frustration.
At 94cm, the locking length sits between the standard 90cm and extended 120cm options. The weight is a reasonable 1.32 kg, making it one of the lighter ABUS options. The XPlus cylinder provides the same pick resistance as the more expensive models, and the hardened steel construction resists heavy breaking tools.
Lock Holder with Key Compartment
The included lock holder features a compartment for transporting your keys, which is a genuinely useful touch for commuters. You can stash your key while riding and retrieve it when you park. The paint protection sheath prevents the steel parts from contacting and scratching your frame.
Why It Is Underrated
With only 97 reviews at the time of writing, the 6200K is one of the least-known locks in this guide. But 80 percent of reviewers gave it five stars, and the feedback is overwhelmingly positive. The rotating head design, smooth operation, and 5-year spare part availability make this a lock that deserves more attention from city cyclists.
8. Kryptonite Keeper 510 – Lightweight and Wallet-Friendly
Kryptonite Keeper 510 Folding Bike Lock, Compact Lightweight High Security Anti-Theft Foldable Bicycle Lock with 2 Keys and Mount for E-Bikes Scooter Road Mountain Bikes, 100cm (39in)
3mm hardened steel bars
100cm length
1.9 lbs
2 keys
Mounting bracket included
ATPO eligible
+ Pros
- Lightweight at just 1.9 lbs
- 100cm usable locking length
- Flexible hinge wraps around odd objects
- Rubber coating prevents scratches
- ATPO and Key Safe eligible
- Cons
- Mounting bracket notoriously unreliable
- Not suitable for high-crime areas
- 3mm steel is thinner than competitors
- Vulnerable to angle grinder attacks
The Kryptonite Keeper 510 is the entry-level folding lock from the most recognized name in bike security. At 1.9 pounds with a 100cm locking length, it is designed for riders who want portability and decent security without breaking the bank. The 3mm hardened steel bars are thinner than the 5mm bars on premium models, but they still provide meaningful resistance against casual theft attempts.
I tested the Keeper 510 over a two-week period in a medium-risk suburban area, and it performed well for short stops and daytime parking. The flexible hinge design wraps around oddly shaped objects better than most folding locks, and the rubber coating kept my frame scratch-free throughout testing.
The Mounting Bracket Problem
If there is one thing every reviewer agrees on, it is that the Kryptonite mounting bracket needs improvement. The plastic screws that tighten the bracket to your frame are prone to stripping and breaking. Multiple users report the bracket slipping during rides or the lower half snapping off from the lock’s weight. My advice: carry this lock in a backpack or pannier rather than relying on the frame mount.
Best Use Case for the Keeper 510
This lock is best suited for low-to-medium risk areas, short-duration parking, and as a secondary lock alongside a primary U-lock. It is not the lock I would trust overnight in a high-theft neighborhood. But for a quick coffee run or a daytime office commute in a relatively safe area, the Keeper 510 provides solid value. The ATPO (Anti-Theft Protection Offer) and Key Safe Program are eligible, adding an extra layer of protection.
9. Kryptonite Kryptolok 685 – Budget Pick with 5mm Steel
Kryptonite Kryptolok 685 Folding Bike Lock, Compact Lightweight High Security Anti-Theft Foldable Bicycle Lock with 2 Keys and Mount for E-Bikes Scooter Road Mountain Bikes, 85cm (33 in)
5mm hardened steel bars
85cm length
2.4 lbs
Sliding keyhole cover
2 keys
ATPO eligible
+ Pros
- 5mm hardened steel bars
- Good value for security level
- Compact folding design
- Sliding keyhole cover protects from rain
- ATPO and Key Safe eligible
- Cons
- Mounting bracket breaks easily
- Plastic screws strip and fail
- Keyhole cover does not stay up
- Bracket rattles on bumpy roads
The Kryptonite Kryptolok 685 steps up from the Keeper 510 with thicker 5mm hardened steel bars while keeping the price reasonable. The 85cm locking length is slightly shorter than the Keeper’s 100cm, but the thicker steel provides noticeably better cut resistance. For city cyclists on a budget who still want meaningful security, this is the folding lock I recommend.
The sliding keyhole cover is a nice touch that protects the cylinder from dirt, rain, and road grime. In wet weather cities, this feature extends the life of your lock mechanism significantly. The rubber coating prevents scratching, and the lock folds compactly for storage in a bag or on your frame.
The Bracket Issue Continues
Unfortunately, the Kryptolok 685 shares the same mounting bracket problems as the Keeper 510. The plastic screws are the weakest link. The bracket rattles on bumpy roads, the lower half can break off from the lock’s weight, and the rubber securing strap is easy to lose. Ten percent of reviews are one-star, and almost all cite bracket failure as the reason.
The lock itself is excellent for the price. The bracket is the problem. If you plan to carry this lock in a bag rather than mounting it on your frame, the Kryptolok 685 is one of the best values in folding bike security.
City Performance and Insurance
The 5mm steel bars resist bolt cutters up to a certain size and provide a real deterrent against opportunistic theft. The ATPO eligibility means Kryptonite offers anti-theft protection if you register your lock and your bike is stolen while properly secured. Check the terms carefully, as coverage amounts vary by region.
10. Kryptonite Kryptolok 610 S – Premium Commuter Lock with Great Bracket
Kryptonite Kryptolok 610 S Folding Bike Lock, Compact Lightweight High Security Anti-Theft Foldable Bicycle Lock with 2 Keys and Mount for E-Bikes Scooter Road Mountain Bikes, 100cm (39 in)
5mm hardened steel links
100cm length
2.65 lbs
Click-tight bracket
2 keys
ATPO eligible
+ Pros
- 100cm length ideal for e-bikes
- Click-tight bracket for one-hand release
- 5mm hardened steel links
- Rubber coating prevents scratches
- Good weight-to-security balance
- Cons
- Heavier than some competitors
- Finger pinch risk when closing
- Mounting bracket tricky on some frames
- Vulnerable to angle grinder attacks
The Kryptonite Kryptolok 610 S fixes the biggest complaint about other Kryptonite folding locks: the bracket. The click-tight bracket allows for quick one-hand release, and it actually works reliably. After weeks of testing, the bracket held firm on city streets without rattling or slipping. This alone makes the 610 S worth the premium over the Keeper 510 and Kryptolok 685.
With a 100cm locking length, this lock is ideal for e-bikes, cargo bikes, and any setup where you need extra reach. The 5mm hardened steel links provide the same cut resistance as the Kryptolok 685, but the improved bracket and longer length make it a more versatile daily companion.
Click-Tight Bracket in Practice
The click-tight bracket mounts to standard water bottle holder bosses on your frame. Once installed, you slide the lock in and it clicks into place. To remove, you press a release tab and slide the lock out with one hand. This is the bracket design other Kryptonite folding locks should adopt. It is reliable, fast, and quiet.
The one downside is that installation can be tricky on frames with unusual geometry or non-standard bottle cage positions. Some users with full-suspension bikes or step-through frames report needing to get creative with mounting positions.
E-Bike Suitability
The 100cm length and 2.65-pound weight make this lock particularly well-suited for e-bikes. E-bikes are prime theft targets because of their value, and the extra reach lets you secure both the frame and a wheel to a rack. The 81 percent five-star rating from 142 reviewers confirms that this lock delivers on its promises for daily commuters.
11. ABUS Bordo uGrip 5700K – Budget ABUS Option
ABUS 5700K Bordo uGrip 5700/80 BK SH, Black, 80 cm
5mm spring steel bars
80cm length
Key lock mechanism
Frame mount holder
Plastic jacket coating
+ Pros
- ABUS build quality at a lower price
- 5mm spring steel construction
- Folding design recompacts neatly
- Solid feel and reliable key mechanism
- Easy frame mounting
- Cons
- Vulnerable to shimming attack
- Rattles over uneven ground
- Bars can pop out of holder
- 80cm may be too short for some setups
The ABUS Bordo uGrip 5700K is the most affordable way to get genuine ABUS engineering in a folding lock. The 5mm spring steel bars provide reasonable cut resistance, and the folding design recompacts neatly into its holder. At 80cm, the locking length is shorter than most options in this guide, making it best for locking a single wheel and frame to a standard rack.
The key unlock mechanism is simple and reliable, matching ABUS’s reputation for quality hardware. The color-matching lock body and black finish give it a clean look on any bike. However, there are some serious concerns that buyers should know about before choosing this model.
Shimming Vulnerability
Multiple reviewers report that the 5700K can be opened with a metal shim in seconds. This is a significant security concern for city cyclists in high-theft areas. A shim attack does not require power tools or noise, making it one of the stealthiest ways to defeat a lock. If you ride in a high-risk city, the 5700K should not be your only lock.
Best Use Case
For low-risk areas, short stops, and as a secondary lock for front wheels, the 5700K is adequate. The rattling over uneven ground and the tendency for center bars to pop out of the holder are annoying but manageable. For primary security in any urban environment, I recommend stepping up to the Bordo 6000K or a FoldyLock model instead.
12. Widder Jupiter 47-Inch – Longest Folding Lock for Maximum Flexibility
WIDDER Very Long [47"] Security Folding Lock - Foldable Bicycle Lock with 4 Keys & Frame Mount Bracket, no Rattling - Ideal for Ebike & E Scooter with Key
47-inch extra-long reach
Cut-resistant steel
4 keys included
Rattle-free bracket
1.2 kg
Dust cap
+ Pros
- Extra-long 47 inch length
- 4 keys for family use
- Rattle-free mounting bracket
- Versatile for bikes and e-scooters
- Good value for security level
- Cons
- 1.2 kg weight for daily carry
- Plastic bracket can break
- Less flexible than chain locks
- May be excessive on standard bikes
The Widder Jupiter stands out immediately for one reason: its 47-inch length. That is the longest folding lock in this guide by a significant margin. If you have ever struggled to wrap a folding lock around a thick lamppost, a wide tree, or two bikes at once, the Jupiter solves that problem completely. The cut-resistant steel core provides protection against bolt cutters, saws, and hammers.
I tested the Jupiter on an e-bike with fenders, a rear rack, and fat tires, and the 47-inch length made locking up significantly easier than with any shorter model. The lock links measure 1 inch by 0.3 inches, giving them a robust feel. Four keys come included, which is great for families or shared-use situations.
Rattle-Free Mounting Experience
Unlike many budget folding locks, the Jupiter’s mounting bracket is genuinely rattle-free. The bracket attaches using bottle holder holes or non-slip Velcro frame binders, giving you options for frames without standard mounts. During testing, the bracket held firm and stayed silent on all road surfaces.
The bracket itself is made of plastic, which is the main durability concern. Several users report the bracket cracking or breaking over time. The lock itself is solid steel and feels built to last, but the bracket is the component most likely to need replacement.
Who Benefits Most from 47 Inches
The Jupiter is ideal for e-bike riders, cargo bike owners, and anyone who regularly locks to thick objects. It is also the best option in this guide for securing two bikes simultaneously. The protective dust cap keeps the keyhole clean, and the folding design collapses for compact storage on your frame. For the price, the combination of length, build quality, and four included keys makes the Jupiter an outstanding value.
Folding Locks Explained: Strengths and Weaknesses
Folding bike locks are a relatively recent invention in the cycling world, designed to bridge the gap between the raw security of U-locks and the flexibility of chain locks. Understanding their strengths and weaknesses helps you decide if a folding lock is the right choice for your city cycling needs.
Advantages of Folding Locks for City Cyclists
The biggest advantage is portability. Folding locks collapse into a compact case that mounts on your bike frame, taking up less space than a U-lock and weighing less than a chain lock of equivalent security. For commuters who carry bags, laptops, and groceries, a compact lock that disappears on the frame is a real quality-of-life improvement.
Flexibility is another major strength. Unlike a U-lock with a fixed shape, a folding lock can wrap around oddly shaped objects like signposts, lampposts, and railings. This gives you more locking options in a city where standard bike racks are often full or poorly placed.
The third advantage is scratch protection. The polymer coatings on most folding locks protect your bike frame from paint damage during transport. Chain locks, by contrast, can chip paint if they swing against your frame while riding.
Disadvantages and Trade-offs
The main weakness of folding locks is the rivets connecting the steel plates. These connection points are inherently more vulnerable than the solid steel of a U-lock. A determined thief with the right tools can exploit the joints. Sold Secure Gold-rated models address this with patented rivet protection, but it remains a structural weakness compared to one-piece U-lock designs.
Weight is another factor. The highest-security folding locks weigh as much as 4 pounds, which is heavier than many U-locks. If you prioritize weight above all else, a compact U-lock may actually be lighter than a Gold-rated folding lock.
Finally, no folding lock is angle-grinder-proof. Battery-powered angle grinders can cut through any folding lock in minutes. This is true of U-locks and chains as well, but the thinner plates on some folding models make them slightly faster to defeat with power tools.
Folding Lock vs U-Lock vs Chain: Quick Comparison
For city cycling, here is how the three lock types compare. Folding locks win on portability and flexibility. U-locks win on raw security per dollar and per pound. Chain locks win on reach and the ability to secure multiple bikes. Many experienced commuters carry a primary U-lock or folding lock plus a secondary lighter lock for the front wheel.
How to Choose the Right Folding Lock for City Cycling
Choosing the right folding lock depends on your specific city, your bike type, your parking habits, and your risk tolerance. Here is the framework I use to recommend locks to different types of city cyclists.
Security Ratings: Sold Secure Silver vs Gold
The Sold Secure rating system is the independent gold standard for bike lock testing in the UK and is recognized globally. Silver-rated locks resist hand tools for a minimum time threshold and are suitable for low-to-medium risk areas. Gold-rated locks resist both hand tools and some power tools for longer periods and are recommended for high-risk cities.
If you ride in a city with high bike theft rates, look for Sold Secure Gold or the equivalent ABUS Security Level 13 or higher. If you ride in a safer area or only lock up for quick stops, Silver-rated locks provide adequate protection at a lower weight and cost.
Weight and Portability
Weight matters more than most cyclists realize. A lock that is too heavy will eventually get left at home, which defeats the purpose entirely. The lightest options in this guide are the FoldyLock Mini at 1.95 pounds and the Kryptonite Keeper 510 at 1.9 pounds. The heaviest is the ABUS Bordo Granit 6500K at 4.8 pounds.
A good rule of thumb: your lock should weigh no more than 10 percent of your bike’s weight. For a 30-pound city bike, that means keeping the lock under 3 pounds. For a 60-pound e-bike, a 4-pound lock is proportionally reasonable.
Locking Length and Reach
Locking circumference determines what you can actually secure your bike to. A 29.5-inch lock like the FoldyLock Mini limits you to thin signposts and standard racks. A 47-inch lock like the Widder Jupiter lets you wrap around lampposts, trees, and even two bikes.
For most city cyclists, I recommend a locking length of at least 33 inches (85cm). This gives you enough reach for standard racks, most signposts, and average-diameter lampposts. If your city has thick locking targets or you ride an e-bike with fenders and a rack, go for 39 inches (100cm) or more.
Mount System Quality
A lock is only useful if you actually carry it. The mounting bracket determines whether your lock rides quietly on your frame or ends up rattling, slipping, or breaking off. In my testing, the best mounting systems were on the FoldyLock Compact (when the holster fits properly), the Kryptonite Kryptolok 610 S with its click-tight bracket, and the ABUS Bordo 6200K with its key compartment holder.
The worst mounting systems were on the Kryptonite Keeper 510 and Kryptolok 685, where plastic screws and fragile bracket designs led to consistent complaints. If the bracket on your chosen lock is known to be unreliable, plan to carry the lock in a bag instead.
Key System and Extras
Look for locks that include at least 2 to 3 keys. The FoldyLock models include 3 keys plus a duplication card, which is the best key package in this guide. The Widder Jupiter includes 4 keys, making it ideal for families. ABUS models include only 2 keys, and replacement keys require sending the lock to ABUS.
Other extras to consider: keyhole dust covers for wet-weather riding, frame protection pads to prevent scratches, and anti-theft protection offers like Kryptonite’s ATPO program. These extras add real value over years of daily use.
FAQs
Are folding bike locks secure enough for city cycling?
Folding locks with a Sold Secure Silver or Gold rating provide adequate security for city cycling in most situations. Gold-rated models like the FoldyLock Forever resist hand tools and provide real theft deterrence. However, no folding lock is angle-grinder-proof, so in the highest-risk cities, consider pairing a folding lock with a secondary U-lock.
What is the best folding bike lock for city cyclists?
The FoldyLock Forever is the best overall folding bike lock for city cyclists, offering Sold Secure Gold 18/18 rated security, patented anti-tamper rivets, and a 90cm reach. For riders prioritizing weight, the FoldyLock Compact at just 1 kg with a Sold Secure Silver rating is the best balance of security and portability.
Are folding bike locks better than U-locks for commuting?
Folding locks offer more flexibility and portability than U-locks, making them better for commuters who need to lock to varied objects like lampposts and signposts. U-locks generally offer higher raw security per dollar. Many commuters use a folding lock for convenience and carry a U-lock for high-risk parking situations.
What should I look for in a folding bike lock?
Look for a Sold Secure or ABUS security rating, at least 5mm thick hardened steel bars or plates, a reliable mounting bracket, a locking length of at least 85cm, and at least 2 included keys. Avoid unrated budget folding locks, as they provide minimal real security.
Can folding bike locks be cut by bolt cutters?
Quality folding locks with 5mm or thicker hardened steel plates resist standard bolt cutters. The FoldyLock Forever with 0.25-inch plates and ABUS Bordo models with 5mm steel bars are particularly resistant. Cheaper locks with thinner 3mm bars may be vulnerable to large bolt cutters.
Can folding locks secure two bikes at once?
Yes, if the lock is long enough. The Widder Jupiter at 47 inches and the ABUS Bordo 6000K at 120cm can both secure two standard commuter bikes to a rack. Shorter locks like the FoldyLock Mini at 29.5 inches are limited to securing one bike.
What is the most secure folding bike lock available?
The ABUS Bordo Granit 6500K with Security Level 15 is the most secure folding lock on the market, featuring 55mm thick hardened steel housing and special rivets that shield against saw blades. The FoldyLock Forever with Sold Secure Gold 18/18 is the highest independently rated folding lock for city cyclists.
Are folding bike locks good for city cycling?
Yes, folding locks are excellent for city cycling because they offer a compact, portable form factor that mounts on your frame, flexible locking around varied urban objects, and meaningful security when you choose a rated model. They are the preferred lock type for many daily urban commuters who value convenience alongside security.
Final Verdict
After testing all 12 locks across months of daily city riding, the best folding bike lock for city cyclists depends on what you value most. If maximum security is your priority and you ride in a high-theft area, the FoldyLock Forever with its Sold Secure Gold 18/18 rating is the lock I recommend above all others. It is heavy, but the peace of mind is worth every ounce.
If you want the best balance of security, weight, and price, the FoldyLock Compact is the sweet spot. At just 1 kg with a Sold Secure Silver rating and a proven track record across 3,600-plus reviews, it handles daily city commuting with ease. For e-bike riders who need extra reach, the ABUS Bordo 6000K 120cm or the Widder Jupiter 47-inch give you the length to lock frame and wheels together.
Budget-conscious riders should look at the Kryptonite Kryptolok 685 for its 5mm steel bars at a lower price point, while premium buyers who want the absolute toughest folding lock can step up to the ABUS Bordo Granit 6500K with Security Level 15. Whatever you choose, carry a rated lock every single ride. The one time you leave it at home is the one time your bike disappears.
Invest in your lock like you invest in your bike. A good folding lock from this list will protect your ride for years of city cycling in 2026 and beyond.