10 Best U Lock of December 2025

• A must on campuses and in high-crime areas
• 8 inch hardened steel shackle and crossbar for Tough Security
• Carrying Bracket with Quick release guarantees ease of Transportation
• Vinyl crossbar and shackle coating Protects bike from scratches
• 500 anti-theft Protection and 2 keys included

BELL

• FOR ALL YOUR SECURITY NEEDS ▶ This Bike U-lock meets all your security needs: a Heavy Duty 16mm U-lock that is Durable and Easy to Use plus a 1800mm Cable that gives you solid security on every location. Enjoy your bike rides knowing your bike is secure!
• SECURE AGAINST ATTACKS ▶ This Bike U lock is made of 16MM Hardened Steel and with the extra 1800 mm Flex Cable this U lock protects your bike securely wherever you go. Thieves will think twice with this lock and choose the next bike, you are secure!
• EASY TO USE AND DURABLE ▶ Locking this U-lock is like a walk in the park: it opens and locks easily, has a smooth keyhole-cover and a cable that stores conveniently with the Velcro Strap. With this lock you will enjoy easy-locking season after season.
• CUSTOMER SERVICE ▶ If this U-lock is not the favorite you ever owned - some say it is heavy, but that means it is secure - just return it and get a 100% refund. No questions asked. We stand for our products. Our customers love that, we know you will too.
• GET IT TOMORROW ▶ If this lock meets your security needs, click "Add to Cart" to get your SIGTUNA 16mm Bike U lock with 1800mm Flex Cable tomorrow. Contact our customer service any time when you order and enjoy the bike security you get with this U-lock.

SIGTUNA

• Sturdy and Durable: Heavy duty bicycle U lock is made of hardened max-performance steel shackle resists cutting and leverage attacks.
• More Safe: Mountain bike locks sing zinc alloy lock core and complex serpentine key slot to against various means of theif effectively.
• Increased Protection: Bike U-lock combin with steel loop cable can provide increased protection for securing front wheel or accessories. With 4ft high-quality steel cable allows greater locking flexibility. For bicycle, motocycle, electromobile.
• Design & Performance: Silica gel layer coated protect the d-lock bike lock prevent scratched. Waterproof bike lock with mounting bracket, no extra packing required.
• With 2 Keys: Bike lock set with 2 pure copper keys, so you'll always have a spare. No trouble forgetting the password.

DINOKA

• Heavy duty U-lock with protective vinyl coating to prevent scratching
• Best used to secure bicycles
• Bike lock has a double locking shackle for pry resistance
• Hardened steel body to resist cutting, sawing, and prying
• 6-1/8 (16 cm) wide, 1/2 in. diameter shackle with 8 in. (20 cm) length and 4 in. (10 cm) width; carrier bracket and two keys included
• Affordable U-Lock Protection
• Disc key for additional anti-pick protection
• Includes carrier bracket for storage convenience
• 6-1/8-inch by 8-inchby 4-inch
• Vinyl coating for weather and scratch resistance

Master Lock

• Why Amazer U lock can keep your bike safe? Amazer U lock is made of 12mm hardened performance steel shackle and covered by a 3.85mm PVC coating(Total lock's thickness is almost 16mm). So it can resist cutting and leverage attacks. The PVC lining on the "U" prevents it from scratching bike paint job.
• Keyless & easy to set combination: Choose Amazer U lock, no more lost keys! 4-digit set your own combination convenience allows for thousands of possible combinations. Prevent thieves use universal key to unlock your lock.
• Dust cover: The combination is covered by a dust cover to protects and extends cylinder life.
• Heavy duty lock offer your bike more safety: The lock's net weight is 1.817 lbs(0.824 kg). The shackle is made of steel, the cylinder is steel and made of solid zinc alloy. Whole lock is covered by quality PC material for good looking and keep your bike from scratching.
• Lock size: 8.96 Inches(length) x 5.74 Inches(width) x 0.624 Inches(thickness) - Please note: Manual measurement for reference only.

Amazer

• STURDY & DURABLE: This bike lock is made of 16mm/0.63inch(including 0.1inch environmentally silicone cover) alloy steel which is cutting-resistant, leveraging-resistant, and dill-resistant. The bicycle lock will provide your bike with more safety.
• SAFER: The lock cylinder of the bike lock is made by C grade pure copper blade, which has a precise structure to prevent technical opening. The bike u lock comes with 3 rust-resistant copper keys that have complex serpentine slots, it will be safer.
• CONVENIENT USE: This bike lock comes with a 4feet double looped ends steel cable which is coated with PVC covering, and the whole diameter of the cable is 0.48inch. It will provide your bike with greater locking flexibility and better protection.
• PORTABLE SIZE: The size of the bike lock is 7.68inch*4.9inch. Comes with a mounting bracket that is suitable for all circular tripod in diameter ≤30mm. With the portable size, you can put the bike u lock into your bag or mount it on the frame of your bike.
• EASY INSTALLATION: The mounting bracket holder is easy to install which enables you to store your bike lock quickly when out on a ride. The silicone cover of u lock will protect your bike from scratches. And it will prolong the life of your u lock.

UBULLOX

• PROTECT YOUR RIDE ✔️ This awarded SIGTUNA Bike U-lock is made of 16MM High-Performance Steel for Extensive Holding Power and Resistance against Cut and Leverage attacks with a wapping 85/100 Security Rating. Get the best security available and protect your ride with Sigtuna Locks!
• CHOOSE POWER ✔️ This Bike Lock Combination has a High-Security Disc-Style Cylinder and Double Deadbolt locking mechanism, very effective and certified against Leverage Attacks. With SIGTUNA you make the right choice and give thieves no chance!
• EASY-TO-USE ✔️ This model SIGTUNA Bike Lock Combination comes with a Easy-to-Install Bike Lock Mount, a Protective Coating to protect your bikes paint and not 2, but 3 Laser-Cut Abloy Keys. With this lock you get Security AND Convenience!
• 100% MONEY-BACK GUARANTEE ✔️ If this U-lock is not the favorite you ever owned - some say it is heavy, but that means quality - just send it back and get a 100% refund. SIGTUNA stands for its products. Our customers love that, we know you will too!
• ORDER YOURS NOW ‎▶‎▶ Click "Add to Cart" NOW to get your 16mm SIGTUNA Bike U lock with 1200mm Flex Cable + Mount Bracket tomorrow and give your Bike the Love it deserves.

SIGTUNA

• 12.7mm Hardended Performance Steel Shackle Resists Hand Tools, Bolt Cutters, and Leverage Attacks
• Interior Locking Dimensions; 4" x 9"
• Key Safe Program; Kryptonite will ship your first 2 keys for free, globally, in the event you lose them.
• Anti-Theft Protection Offer; Up to $1,750 Reimbursement
• Lifetime Warranty

Kryptonite

• ✔️ DURABLE ALL-WEATHER PROTECTION – Via Velo bike U-lock with hexagonal PVC cover resists corrosion from water, dust and dirt to prolong the life of your lock. All-weather performance means peace of mind and better security
• ️ ✔️ EASY AND STRONG TO LOCK YOUR BIKE – The bike lock with thickness(including rubber casing):14mm,250mm x 150mm U shack to lock and go! Locking your bike and your wheels with 10mm x 180cm cable, fast and easy with our quick, no-hassle system. Great bike safety tool
• ✔️ AMAZING CONVENIENCE AND SECURITY – 2 keys for convenience! The bike U-lock comes with 2 keys. One of them you can take and use in daily life and the other you can leave at home in case the trouble when you lose one carelessly
• ✔️ SIMPLY INSTALLING BRACKET ON YOUR BIKE – Convenient high-quality mounting bracket means your lock goes with you, Our bracket is suitable for bike tube:20-42mm. Pls refer to our picture to install the bracket Value for your money
• ✔️ WARRANTY AND CUSTOMER SERVICE: 3-year warranty applies to U lock for US, CA, UK, EU Cyclists, 90-day money back policy, 24-hour online customer service. If you are not satisfied with it, you get a full refund unconditionally. Rest assured

Via Velo

• MORE CONVENIENT U-LOCK - From the makers of OTTOLOCK, the SIDEKICK brings innovation to the traditional U-Lock with a compact, lightweight design that effectively deters opportunity theft without weighing you down. Simple to use and to carry, the portable SIDEKICK easily fits in many backpacks, bags, or pockets.
• LIGHTWEIGHT BIKE LOCK - At only 750 grams (1.65 lbs), the SIDEKICK allows you to lock a single tube to a post or pole at a fraction of the weight of a traditional U-Lock. The opening measures 2.75” x 5.75” (7cm x 14.5cm). Each lock comes with 2 keys.
• PROTECT YOUR FRAME - The body of the SIDEKICK is coated in high quality silicone that won’t scratch or damage your bike frame. Made with double-shackle 12mm hardened steel and an antirotation deadbolt for security and durability.
• VERSATILE SECURITY - Use the SIDEKICK on its own or with a secondary lock depending on the length of your stop and location.
• EASY-TO-USE - The SIDEKICK comes with two keys, and the compact size and bright color options make it great for kids and new riders who want to protect their bikes.

OTTOLOCK