If you’re searching for a reliable shackle lock for your bike rack, you’re likely balancing security, durability, and ease of use. The Sportneer Heavy Duty Bike U Lock stands out as the best overall for its robust build and versatile features. The Kryptonite Keeper offers premium security, while the Master Lock 8170D provides a budget-friendly option that still delivers solid protection. Each choice comes with tradeoffs—some excel in strength, others in convenience or price. Keep reading to see how these options compare and find the perfect lock for your needs.
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Key Takeaways
- The thickest shackles generally offer better cut resistance but can be heavier and less portable.
- Locks with mounting brackets simplify storage but may reduce portability for on-the-go use.
- Higher security often means increased price; balance your risk level with your budget.
- Keyed locks tend to be more secure than combination models, but losing keys can be inconvenient.
- Versatility in cable length and locking options enhances usability across different bike rack setups.
| Sportneer Heavy Duty Bike U Lock with Steel Cable and Mounting Bracket | ![]() | Best Overall for Versatile, Heavy-Duty Security | Dimensions: 7.76″x5.02″ | Shackle Diameter: 17mm | Weight: 1.64 lbs | VIEW ON AMAZON | See Our Full Breakdown |
| Heavy Duty Anti Theft Bike U Lock with Long Shackle, Security Cable, and Mounting Bracket | ![]() | Best for Flexible Locking with Long Shackle | Shackle Length: Long shackle | Cable Length: 4 feet | Includes: U lock, security cable, mounting bracket, keys | VIEW ON AMAZON | See Our Full Breakdown |
| Master Lock U-Lock Keyed Bike Lock, 7-1/4-inch, Model 8320D | ![]() | Best for High-Security Urban Environments | Brand: Master Lock | Model Number: 8320D | Lock Body Width: 7-1/4 inches | VIEW ON AMAZON | See Our Full Breakdown |
| Sportneer Bike U Lock – 18mm Shackle Heavy Duty Bicycle Lock with 6ft Security Cable and Mounting Bracket | ![]() | Best for Heavy-Duty Security with Extended Cable | Dimensions: 9.85”x6.3” | Shackle Thickness: 18mm | Weight: 3.2 lbs | VIEW ON AMAZON | See Our Full Breakdown |
| Master Lock 8170D U-Lock with 8-inch Shackle, Black | ![]() | Best for Compact, Urban Security | Width: 6-1/8 inches | Shackle Length: 8 inches | Shackle Diameter: 1/2 inch | VIEW ON AMAZON | See Our Full Breakdown |
| NDakter Heavy Duty Bike Lock with Steel Cable, 18mm Shackle, 3 Keys, for E-bike, Motorcycle, Scooter, and More | ![]() | Best Overall for Heavy-Duty Security | Shackle Diameter: 18 mm | Weight: 3.4 lb | Cable Length: 6 ft | VIEW ON AMAZON | See Our Full Breakdown |
| Schwinn Bike U-Lock with Keys, 12 mm x 7.5 inches, Black | ![]() | Best for Compact Urban Use | Shackle Diameter: 12 mm | Length: 7.5 inches | Color: Black | VIEW ON AMAZON | See Our Full Breakdown |
| Kryptonite Keeper Bike U-Lock with Mounting Bracket | ![]() | Best for High Security with Durability | Shackle Diameter: 12 mm | Locking Dimensions: 4 in. x 10 in | Weight: 2.25 lbs | VIEW ON AMAZON | See Our Full Breakdown |
| Sportneer Bike Lock – 17mm Heavy Duty Anti-Theft U-Lock with 2 Keys and Mounting Bracket | ![]() | Best for Versatile & Heavy-Duty Security | Shackle Diameter: 17 mm | Dimensions: 7.76” x 5.02” | Thickness: 0.67 inches | VIEW ON AMAZON | See Our Full Breakdown |
| USHAKE Heavy Duty Bike U Lock, Combination Paddle Lock Anti Theft | ![]() | Best Keyless Convenience for Moderate Security | Weight: 1.25 pounds | Shackle Diameter: 10 mm | Material: Zinc alloy | VIEW ON AMAZON | See Our Full Breakdown |
| shackle lock for bike rack | Shackle Diameter | Weight | Material |
|---|---|---|---|
| Sportneer Heavy Duty Bike U Lo | 17mm | 1.64 lbs | Zinc alloy, alloy steel, silicone coating |
| Heavy Duty Anti Theft Bike U L | — | — | — |
| Master Lock U-Lock Keyed Bike | — | — | Hardened steel |
| Sportneer Bike U Lock | — | 3.2 lbs | Zinc alloy, alloy steel |
| Master Lock 8170D U-Lock with | 1/2 inch | — | — |
| NDakter Heavy Duty Bike Lock w | 18 mm | 3.4 lb | — |
| Schwinn Bike U-Lock with Keys | 12 mm | — | Vinyl coated steel |
| Kryptonite Keeper Bike U-Lock | 12 mm | 2.25 lbs | — |
| Sportneer Bike Lock | 17 mm | 1.8 lbs | — |
| USHAKE Heavy Duty Bike U Lock | 10 mm | 1.25 pounds | Zinc alloy |
More Details on Our Top Picks
Sportneer Heavy Duty Bike U Lock with Steel Cable and Mounting Bracket
This Sportneer U lock stands out for its combination of heavy-duty construction and added versatility, featuring a robust zinc alloy lock core, a 5ft steel cable, and a mounting bracket. Its resistant to cutting, sawing, smashing, and drilling, making it suitable for high-risk areas. Compared with the Sportneer Bike U Lock – 17mm, this model offers a longer cable for more flexible locking options, but it also adds weight—nearly 1.64 lbs—that could be cumbersome for daily carrying. The silicone coating enhances durability against weather, yet the lock’s size may not fit larger frames or thicker tubes, limiting universal compatibility. Overall, this pick makes the most sense for users who prioritize maximum security and versatility, accepting some size and weight tradeoffs.
Pros:- Heavy-duty and resistant to cutting, sawing, smashing, and drilling
- Includes a 5ft steel cable and mounting bracket for versatile security
- Water, dust, and dirt resistant with a durable silicone coating
- Comes with two keys for convenience
Cons:- Lock size may not fit larger bike frames or thicker tubes
- Heavy weight may be less convenient for daily carry
- Requires proper size check for compatibility with bike or items
Best for: Cyclists needing a high-security, portable lock with flexible locking options and weather resistance.
Not ideal for: Casual riders with lightweight bikes or those seeking a compact lock for easy storage.
- Dimensions:7.76″x5.02″
- Shackle Diameter:17mm
- Weight:1.64 lbs
- Cable Length:5ft
- Lock Body Design:Polygonal
- Material:Zinc alloy, alloy steel, silicone coating
Our verdict“This lock is best suited for those who need maximum security and flexibility, despite added weight and size considerations.”
Heavy Duty Anti Theft Bike U Lock with Long Shackle, Security Cable, and Mounting Bracket
This model emphasizes locking flexibility with its long shackle, making it ideal for securing bikes to various fixtures. Its 4-foot security cable and included mounting bracket add multi-layer security options, especially useful for e-bikes and scooters. Compared to the Sportneer Heavy Duty Bike U Lock, this lock’s longer shackle offers more reach, but it also comes with the downside of increased weight—potentially less convenient for frequent carry. Its durable construction with a silicone cover helps withstand weather, yet the longer shackle can be slightly more vulnerable to leverage attacks. This lock makes sense for riders needing adaptable locking points but who are willing to manage some added weight and bulk.
Pros:- Long shackle offers greater locking flexibility
- Includes a 4-foot security cable and mounting bracket
- Durable construction with protective silicone cover
- Suitable for multiple bike types including e-bikes and scooters
Cons:- Heavy weight may be cumbersome for some users
- Longer shackle may be more vulnerable to leverage attacks
- Bulkier design could be less discreet
Best for: Daily commuters locking e-bikes, scooters, or bikes with irregular frame shapes needing flexible securing options.
Not ideal for: Lightweight bike owners or those who prefer minimal, easy-to-carry locks for short stops.
- Shackle Length:Long shackle
- Cable Length:4 feet
- Includes:U lock, security cable, mounting bracket, keys
- Suitable For:Bicycles, e-bikes, scooters, commuter bikes
Our verdict“This lock suits riders who need adaptable locking options with extra reach, accepting some weight and size tradeoffs.”
Master Lock U-Lock Keyed Bike Lock, 7-1/4-inch, Model 8320D
The Master Lock 8320D is a solid choice for urban riders needing a compact yet heavy-duty lock. Its 7-1/4 inch size balances portability with security, offering a hardened steel body and double locking shackle, which enhances resistance against prying and cutting. Compared with the Master Lock 8170D, this model’s narrower profile makes it easier to handle and store, but it also limits the size of objects it can secure. The disc key mechanism adds pick resistance, though the need to carry keys could be less convenient than a combination lock. This lock is ideal for city use but might fall short for securing larger or multiple items simultaneously.
Pros:- Heavy-duty steel construction offers strong security
- Double locking shackle enhances pry resistance
- Vinyl coating prevents scratches on bike frames
- Includes mounting bracket and two keys for convenience
Cons:- Limited to 7-1/4 inch size, restricting larger securing options
- Keyed lock less convenient than combination for some users
- Weight may be less ideal for frequent carrying
Best for: Urban cyclists who prioritize security in high-risk areas and prefer a keyed lock over combination models.
Not ideal for: Casual riders or those seeking a lightweight, quick-release lock for short stops or casual use.
- Brand:Master Lock
- Model Number:8320D
- Lock Body Width:7-1/4 inches
- Shackle Length:9 inches
- Material:Hardened steel
- Color:Vinyl-coated
Our verdict“This lock is best for urban environments where high security and a compact size are priorities, despite some size and convenience tradeoffs.”
Sportneer Bike U Lock – 18mm Shackle Heavy Duty Bicycle Lock with 6ft Security Cable and Mounting Bracket
This Sportneer U-lock offers an impressive 18mm shackle, making it one of the most resistant options against cutting and sawing among bike locks. Its 9.85 x 6.3 inch dimensions provide a substantial security presence, especially with the included 6ft steel cable for extra locking versatility. Compared to the Heavy Duty Anti Theft Bike U Lock with Long Shackle, this model’s thicker shackle enhances security, but at the cost of increased weight—over 3.2 lbs—that could be less practical for all-day portability. The water-resistant silicone coating helps it endure rough weather, making it suitable for high-theft risk locations where durability matters most.
Pros:- Heavy-duty 18mm shackle resists cutting and sawing
- Includes a 6ft security cable for versatile locking
- Water and dust resistant silicone coating
- Easy to install with a compatible mounting bracket
Cons:- Relatively heavy at 3.2 lbs, less convenient for daily carry
- Size may not fit all bike frames or storage spaces
- Requires careful key management due to weight
Best for: Serious security-conscious riders who need maximum resistance against theft and versatile locking options.
Not ideal for: Casual cyclists or those who prefer lightweight, compact locks for quick stops.
- Dimensions:9.85”x6.3”
- Shackle Thickness:18mm
- Weight:3.2 lbs
- Cable Length:6 ft
- Material:Zinc alloy, alloy steel
- Water Resistance:Yes
Our verdict“This lock is ideal for riders seeking maximum security and durability, accepting the weight penalty for peace of mind.”
Master Lock 8170D U-Lock with 8-inch Shackle, Black
The Master Lock 8170D offers a sturdy, straightforward design with its 8-inch shackle and 6-1/8 inch width, balancing security with portability. Its hardened steel body and double locking shackle provide strong protection against theft, with the vinyl coating preventing scratches on your bike. Compared with the Master Lock 8320D, this lock’s smaller size makes it more manageable for urban riders who need a quick, reliable lock for short stops. However, its limited size might restrict use on larger frames or multiple bikes, and the weight could be an inconvenience for those who prefer a lightweight option. This lock fits riders needing a compact, high-security solution for city environments.
Pros:- Heavy-duty hardened steel construction
- Double locking shackle enhances security
- Includes carrier bracket for easy transport
- Resistant to cutting and prying attacks
Cons:- Limited to 8-inch shackle, restricting larger securing needs
- Relatively heavy for its size
- Size may not fit all bike frames or locking scenarios
Best for: Urban commuters securing bikes in crowded locations where size and ease of transport matter most.
Not ideal for: Riders with larger bikes or those needing to secure multiple items at once.
- Width:6-1/8 inches
- Shackle Length:8 inches
- Shackle Diameter:1/2 inch
- Color:Black
- Includes:2 keys, carrier bracket
Our verdict“This lock is perfect for city riders seeking a compact, high-security device, despite some size limitations.”
NDakter Heavy Duty Bike Lock with Steel Cable, 18mm Shackle, 3 Keys, for E-bike, Motorcycle, Scooter, and More
This lock stands out for its robust 18 mm hardened steel shackle and included 6 ft steel cable, making it ideal for securing high-value bikes and motorcycles. Compared to the Kryptonite Keeper, it offers a longer cable, providing more flexibility in locking multiple items or securing around larger fixtures. The double deadbolt mechanism and dust cover add layers of security, but the lock’s weight—over 3 pounds—may make it less practical for daily carrying. Its heavy-duty construction is perfect for environments where theft risk is high, yet the absence of a mounting bracket means you’ll need to find a separate way to transport it. This pick is best suited for users prioritizing maximum security over portability.
Pros:- Exceptional 18 mm hardened steel shackle for high security
- Includes a versatile 6 ft steel cable for multiple locking options
- Dust cover and silicone protection resist rust and frame scratches
Cons:- Mounting bracket not included, requiring additional purchase or DIY solutions
- Heavy weight may be inconvenient for daily transport
- Requires careful handling to prevent scratching bikes during use
Best for: Owners of expensive e-bikes, motorcycles, or scooters needing reliable, heavy-duty protection outdoors.
Not ideal for: Casual cyclists or urban commuters seeking lightweight, everyday locks for short rides, as this is bulky and heavy.
- Shackle Diameter:18 mm
- Weight:3.4 lb
- Cable Length:6 ft
- Cable Thickness:0.4 in
- Outer Dimensions:7.8 x 9.2 in
- Keys Included:3
Our verdict“This lock is ideal for riders who need maximum security and don’t mind the weight or extra setup steps.”
Schwinn Bike U-Lock with Keys, 12 mm x 7.5 inches, Black
The Schwinn U-Lock provides dependable security with a sturdy 12 mm shackle and a compact 7.5-inch length, making it suitable for locking smaller frames or securing wheels in urban environments. Compared with the Sportneer 17 mm lock, it offers a more portable size but less cutting resistance due to its thinner shackle. Its vinyl coating protects bikes from scratches and weather, and the included mounting bracket ensures easy transportation. However, the limited length means it may not fit larger bikes or around bulky fixtures, and some users might prefer a lock with a longer shackle for more versatility. It’s best suited for casual riders who need a lightweight, reliable lock for short-term use.
Pros:- Strong hardened steel shackle for reliable theft deterrence
- Vinyl coating prevents scratches and weather damage
- Includes a convenient mounting bracket for easy storage
Cons:- Limited to 7.5-inch length—may not fit all bikes
- Key lock system less quick to operate than combination options
Best for: Urban cyclists securing bikes at cafes, dorms, or quick stops where space is limited.
Not ideal for: Long-distance riders or those securing bikes overnight in high-theft areas, due to its shorter shackle and moderate security level.
- Shackle Diameter:12 mm
- Length:7.5 inches
- Color:Black
- Material:Vinyl coated steel
- Keys Included:2
Our verdict“This lock works best for riders needing a compact, secure lock for short-term urban parking.”
Kryptonite Keeper Bike U-Lock with Mounting Bracket
The Kryptonite Keeper features a 12 mm hardened steel shackle paired with a disc-style cylinder, offering excellent resistance against picking, drilling, and cutting. Compared to the Schwinn lock, it provides a thicker shackle and superior security features, making it ideal for high-theft risk areas. Its vinyl coating helps prevent scratches on bikes, and the included mounting bracket simplifies transport. However, at 2.25 pounds, it’s on the heavier side, which could be a drawback for daily commuters. The lock’s relatively compact dimensions mean it’s best suited for securing bikes in places where space is limited but theft risk is high—less so for locking larger items or in extended outdoor settings.
Pros:- High-security 12 mm hardened steel shackle
- Pick and drill resistant disc-style cylinder
- Includes a durable mounting bracket for portability
Cons:- Relatively heavy at 2.25 lbs, less suited for daily carrying
- Limited locking dimensions may restrict use with larger objects
Best for: Urban cyclists and bike commuters needing a high-security lock with excellent pick and drill resistance.
Not ideal for: Bikers seeking lightweight, quick-to-use locks for casual or frequent short-term parking, due to weight and size constraints.
- Shackle Diameter:12 mm
- Locking Dimensions:4 in. x 10 in
- Weight:2.25 lbs
- Keys:2 stainless steel
Our verdict“This lock is ideal for users who prioritize high security and are okay with added weight and slightly limited flexibility.”
Sportneer Bike Lock – 17mm Heavy Duty Anti-Theft U-Lock with 2 Keys and Mounting Bracket
The Sportneer 17mm U-Lock combines a thick zinc alloy shackle with a steel core, offering strong resistance against cutting, sawing, and drilling—making it comparable to the heavier NDakter lock but more portable. Compared with the USHAKE combination lock, it provides a higher security level with a solid key-based system. Its water-resistant silicone coating and included mounting bracket enhance usability for outdoor riding. The lock weighs about 1.8 pounds, making it easier to carry daily, though its size may not fit all bike frames or locks around larger posts. Overall, this lock balances security and portability, making it suitable for riders who want a tough lock without excessive weight.
Pros:- High security with resistance to cutting, sawing, and smashing
- Water-resistant coating for outdoor durability
- Includes three keys and a mounting bracket for convenience
Cons:- Size may not fit all bike frames or locking points
- Weight, though moderate, may still be a concern for some users
Best for: Cyclists needing a heavy-duty, portable lock for diverse environments, including urban and trail use.
Not ideal for: Users who prefer keyless locks or have very large bike frames that require longer shackle lengths, as this lock’s size is somewhat limited.
- Shackle Diameter:17 mm
- Dimensions:7.76” x 5.02”
- Thickness:0.67 inches
- Weight:1.8 lbs
- Key Count:3
- Mounting Bracket Compatibility:Under 26mm/1.02inch-38mm/1.5inch
Our verdict“This lock offers a strong balance of security and portability for riders who need a versatile, heavy-duty solution.”
USHAKE Heavy Duty Bike U Lock, Combination Paddle Lock Anti Theft
The USHAKE heavy-duty U-lock features a 10 mm zinc alloy shackle combined with a 4-digit combination lock, offering keyless convenience for riders who prefer quick access. Compared with the Kryptonite Keeper, it has a slightly thinner shackle but benefits from a keyless system, reducing the risk of lost keys. Its PVC coating and weather-resistant design make it suitable for outdoor use, and the included mounting bracket allows easy transport. However, the 4-digit combination may be less secure than longer, more complex codes, and resetting the code after purchase is an extra step users need to remember. Its lighter weight—just 1.25 pounds—makes it attractive for everyday use, but some may find the security level less robust than keyed or thicker shackle options.
Pros:- Keyless 4-digit combination for quick, easy access
- Heavy-duty zinc alloy shackle resists cutting
- Weather-resistant design with PVC coating
Cons:- Shorter shackle limits locking options
- Combination code must be reset after initial use
Best for: Casual riders or those seeking a quick, keyless lock for short-term, low-theft-risk parking.
Not ideal for: High-theft areas or securing high-value bikes, where more robust security features are necessary.
- Weight:1.25 pounds
- Shackle Diameter:10 mm
- Material:Zinc alloy
- Lock Type:Combination U-lock
- Recommended Uses:Bike, motorcycle, scooter, gate, fence
Our verdict“This lock is best for riders who prioritize convenience and moderate security in low-theft environments.”

How We Picked
The products in this roundup were evaluated primarily on their security features, build quality, and ease of use. We looked for shackle locks with durable materials like hardened steel, and assessed their resistance to cutting and tampering. Usability factors such as mounting options, key systems, and cable flexibility also played a role. Our ranking favors locks that provide the best balance between security and practicality, considering both everyday commuters and more security-conscious cyclists.| shackle lock for bike rack | Material |
|---|---|
| Sportneer Heavy Duty Bike U Lo | Zinc alloy, alloy steel, silicone coating |
| Heavy Duty Anti Theft Bike U L | — |
| Master Lock U-Lock Keyed Bike | Hardened steel |
| Sportneer Bike U Lock | Zinc alloy, alloy steel |
| Master Lock 8170D U-Lock with | — |
| NDakter Heavy Duty Bike Lock w | — |
| Schwinn Bike U-Lock with Keys | Vinyl coated steel |
| Kryptonite Keeper Bike U-Lock | — |
| Sportneer Bike Lock | — |
| USHAKE Heavy Duty Bike U Lock | Zinc alloy |
Factors to Consider When Choosing Shackle Lock For Bike Racks
Choosing the right shackle lock for your bike rack involves more than just picking the heaviest or most expensive option. Consider how often you’ll use the lock, where you’ll park, and your budget. The right lock should protect your bike without becoming an unwieldy burden. Here are key factors to keep in mind as you shop.Security Level and Material
The most important aspect of a shackle lock is its ability to resist tampering. Locks made from hardened steel with double-locking mechanisms tend to be more resistant to cutting and leverage attacks. Cheaper locks may feature softer metals that are easier to pry open. Balance the level of security you need with your budget, especially if your bike is a high-value model or parked in high-theft areas.
Shackle Size and Flexibility
The length and thickness of the shackle influence both security and practicality. Thicker shackles are harder to cut but can limit how you lock your bike to different rack configurations. Longer shackles provide more locking options, especially if you need to secure multiple bikes or to larger fixtures. Choose a size that fits your typical parking situation without adding unnecessary weight.
Mounting and Portability
Many locks come with mounting brackets, which help keep your lock accessible and secure when not in use. However, a fixed mount can be inconvenient if you prefer carrying your lock during rides. Consider whether you need a lock that can be easily removed and stored or one that remains mounted for quick access. The tradeoff often involves weight and security—mounted locks are less likely to be lost but can add bulk.
Keying System and Ease of Use
Locks with keyed systems tend to offer higher security because they are less susceptible to accidental unlocking, but losing keys can be a hassle. Combination locks eliminate the need for keys but may be less secure if the combination is simple or easily guessed. Look for locks that include backup keys or have resettable combinations if convenience and security are priorities.
Price and Overall Value
Security features often correlate directly with price, but that doesn’t mean the most expensive lock is always the best choice for your needs. Consider how often you lock your bike, the typical parking environment, and whether extra features like cable attachments or mounting ease justify a higher price. Investing in a slightly more expensive lock can save you money and frustration in the long run if it offers better protection.
Frequently Asked Questions
Is a thicker shackle always better for bike security?
While thicker shackles generally offer increased resistance to cutting and leverage attacks, they are not the only factor to consider. The material quality, lock mechanism design, and overall construction also play critical roles. A well-designed lock with a thinner shackle made from hardened steel can sometimes provide better security than a bulkier, lower-quality option. Evaluate security features holistically rather than relying solely on shackle thickness.
Should I prioritize a keyed lock or a combination lock?
Keyed locks typically provide greater security because they are less vulnerable to simple code guessing or manipulation. However, losing keys can be inconvenient, especially if you don’t have a spare. Combination locks are more convenient and eliminate key concerns but may be less secure if the combination is simple or easily observed. Your choice depends on your security needs and how often you’ll access the lock.
Can I use a shackle lock on different types of bike racks?
Most shackle locks are versatile enough to secure bikes to various rack types, provided the shackle length suits your setup. Longer shackles offer more flexibility for locking multiple bikes or larger fixtures, while shorter shackles may be more stable and harder to tamper with. Always check the shackle dimensions against your typical rack configuration to ensure compatibility.
Is a lock with a mounting bracket worth it?
A mounting bracket can make storing and accessing your lock more convenient, especially if you park frequently. However, it can add weight and may reduce portability if you prefer to carry your lock during rides. If you value quick access and have a secure storage spot, a lock with a mount is a solid choice; otherwise, a portable lock might suit active cyclists better.
When should I spend more on a bike lock?
Spending more makes sense if your bike is high-value or stored in high-theft areas. Premium locks often feature superior materials, advanced locking mechanisms, and better resistance to cutting and picking. For everyday commuting in relatively low-risk areas, a mid-range lock can offer sufficient protection without overspending. Weigh the cost against the potential loss or damage to your bike.
Conclusion
For cyclists seeking maximum security and durability, the Sportneer Heavy Duty Bike U Lock stands out as the best overall choice. If you prioritize value and affordability, the Master Lock 8170D offers solid protection at a lower price point. Those with a premium budget should consider the Kryptonite Keeper for top-tier security features. Beginners or casual users may prefer locks with simple mechanisms and mounting options, while security-conscious riders should look for heavy-duty, hardened steel models. With this guide, you can confidently select the shackle lock that best fits your cycling habits and security needs.
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