Best Master Lock Bike U Locks in 2026

3mm Hardened Max Performance Steel Shackle Resists Hand Tools, Bolt Cutters, and Leverage Attacks; 10mm Steel Looped Cable For Additional Security.Note: Measure your door's backset, cross bore and thickness to ensure you find the right fit.

Interior Locking Dimensions: 3.25" x 7" Cable Length: 4'

Key Safe Program; Kryptonite will ship your first 2 keys for free, globally, in the event you lose them

✔️HIGH-SECURITY & WEATHERPROOF CERTIFIED BY SOLD SECURE – This U-lock has been independently tested and certified by UK Sold Secure |Test Bicycle Category:SS104:2020|Certificate:2090, a leading testing and certification organization for security products. The 14mm hardened steel construction provides a strong and durable barrier against theft and harsh weather conditions.

️ ✔️ EASY AND STRONG TO LOCK YOUR BIKE – The bike lock with thickness(including rubber casing):14mm,9.84 in (250mm) x 5.51 in (140mm) 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

STURDY: This bike u lock is made of 0.63inch(including 0.1inch silicone cover) carbon structural steel which is cutting-resistant, leveraging-resistant. The silicone cover makes u lock can resist corrosion from dust and dirt to prolong the life of your bike lock.

NO BLOCKING: The lock cylinder of u lock is made by zinc alloy blade, which has a precise structure to prevent technical opening. With the lock dust cover and zinc alloy lock cylinder, no need to worry about blocking when opening the bicycle lock.

CONVENIENT USE: The bike lock comes with a 5feet renforcement steel cable which is coated with PVC covering, and the whole diameter of it is 0.47inch. With the cable, it will provide your bike with greater locking flexibility and better protection.

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.

Product 1: Outdoor heavy duty bike U-lock is best used as a bicycle lock

Product 1: U-shaped steel bike lock with key; Includes carrier bracket for easy transportation

Product 1: Bike lock features a hardened steel body and double locking shackle for superior cutting and prying resistance

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 drill-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 2 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.

✔️HIGH-SECURITY & WEATHERPROOF CERTIFIED BY SOLD SECURE – This U-lock has been independently tested and certified by UK Sold Secure| Test Bicycle Category:SS104:2020-Silver| Certificate:2090, a leading testing and certification organization for security products. The 15mm hardened steel construction provides a strong and durable barrier against theft and harsh weather conditions.

✔️ EASY AND STRONG TO LOCK YOUR BIKE – The bike lock with 15mm x7.5 inch U shack to lock and go! Locking your bike and your wheels with 10mm x 1.8 m (6 ft) cable, fast and easy with our quick, no-hassle system. Great bike safety tool

✔️HEAVY-DUTY BIKE U LOCK WITH CABLE: This bike u-lock has an extra thickness of 0.6-inch and the U-shape size is 11”x6”, it was also made of HRC55 Rockwell super-hardness stainless steel fully coated with weatherproof PVC and rubber. The extension cable of 6-foot long and 0.4-inch thickness would provide extra protection to both your bike and helmet

A must on campuses and in high-crime areas.Note: Measure your door's backset, cross bore and thickness to ensure you find the right fit.

8 inch hardened steel shackle and crossbar for Tough Security

Carrying Bracket with Quick release guarantees ease of Transportation

【KEYS-FREE】Bike lock combination for security of your, motorcycle, electric scooter, gate. No more worry for forgetting keys with scooter lock with combination.

【COMBINATION】A strong motorcycle lock with easily setup to your own 4 numbers by the fist use. Smooth dials turning gives you confidence for quality.

【STRONG SHACKLE】The bike locks heavy duty anti theft 10 mm hardened zinc alloy shackle resists both cutters and leverage attacks. 4mm PVC coating paddle lock protects the lock from any scratching. Good gate locks for metal fence.

20/20 DIAMOND SOLD SECURE ULOCK - Best Portable & Solid Professional Bike Lock to Protect Your Bicycle. Pro Equipment for City Outdoor & Urban Cycling. Bolt Cutter Drill & Saw Proof. Mounting Bracket Sold Separately

PATENT ULTRA STRENGTH HEAVY DUTY ANTI THEFT TECHNOLOGY - Thick Anti Cut Waterproof Weatherproof Protector with Antitheft Pentagonal Shaped Crossbars. Hardened Steel Components for High Level Theft Prevention

SUPER WIDE OPENING FOR EASY LOCKING - Opens to Extra Huge 115 MM Size Clearance for Maximum Long Locking. Oversized for Flexible Free Range of Use & Fast Protection Anywhere. No Chain or Code Required!

KEYS-FREE: No need any key to secure your, motorcycle, e-scooter, gate. No more worry for forgetting keys.

STRONG SHACKLE: The 14 mm hardened zinc alloy shackle resists both cutters and leverage attacks. 4mm PVC coating protects the lock from any scratching.

COMBINATION: Easily set your own 5 numbers by the fist use. Smooth dials turning gives you confidence for quality.

🔒【𝟮𝟬𝟮𝟮 𝗧𝗼𝘂𝗴𝗵𝗲𝘀𝘁 𝗟𝗼𝗰𝗸】Abandon the bicycle lock on the market with small size and thin inner material shortcomings, we designed this NEWEST bicycle u lock. Stronger Heavy Duty Anti Theft Bike Lock（2.6lb/1.2kg). No one will be able to cut this lock. Max 25mm hardened steel shackle while minimum 18.76mm u lock for scooter (14.73 mm carbon steel alloy). which is built to withstand attack from bolt cutters and leverage attacks. NOTICE: NO bracket available

🔒【𝗗𝗼𝘂𝗯𝗹𝗲 𝗕𝗼𝗹𝘁 𝗠𝗲𝗰𝗵𝗮𝗻𝗶𝘀𝗺】Our u lock for bicycle has a double opening head, the thief needs to pry both sides at the same time to open it. Top bike u lock directly into a crossbar with a dual locking mechanism, providing resistance to prying, pulling and jacking. Scooter locks sophisticated double locking systems, which are less likely to be broken than their cheap counterparts

🔒【𝗦𝗶𝗹𝗶𝗰𝗼𝗻𝗲 𝗥𝘂𝗯𝗯𝗲𝗿 𝗖𝗼𝗮𝘁】Anti-theft bike U-lock is fully covered by a 4-11MM premium silicone coating thickness, ensuring that your beloved bicycle will not be scratched when in use. Bicycle d lock weather protection mechanism that keeps the lock in good working order by preventing rust even when it rains a lot. Prolonging the service life of this anti theft bicycle lock. Suitable for bicycles, motorcycles, electric bikes, scooters

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 3 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.

★★ Bike U-lock is made of 0.63 inch(16mm) high-performance steel against cut and leverage attacks. With silicone cover resists corrosion from water, dust and dirt to prolong the life of your lock. The bicycle U lock size 9.25 × 6.89 inch, which is widely used in mountain bicycles, road bicycles, and folding bicycles, providing you with high-quality bicycle safety protection.

★★ The lock cylinder of this U lock is made by pure copper blade, increasing safety factors of your bike or accessories. Pull and drill-resistant lock cylinder. Double bolt mechanism locks the shackle to the crossbar in two places, protecting against pulling, leveraging and twisting. 3 Keys included

★★ The bike lock comes with a 5 feet 11 inch (1800mm) steel cable which is coated with PVC covering. The whole diameter of the cable is 0.39inch(10mm). This double loop flex cable will provide your bike with greater locking flexibility and better protection

STURDY: This bike u lock is made of 0.63inch(including 0.1inch PVC cover) carbon structural steel which is cutting-resistant, leveraging-resistant. The PVC cover makes u lock can resist corrosion from dust and dirt to prolong the life of your bike lock.

NO BLOCKING: The lock cylinder of u lock is made by zinc alloy blade, which has a precise structure to prevent technical opening. With the lock dust cover and cooper lock cylinder, no need to worry about blocking when opening the bicycle lock.

PORTABLE: The size of the u lock is 8.3*5.7inch. Comes with a mounting bracket that is suitable for all circular tripod in diameter ≤1.18inch. With the portable size, you can put this bike u lock into your bag or mount it on the frame of your bike.

[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!

✔️ 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

✔️2-IN-1 BIKE LOCK SET – This set comes with (1) 2 Set of 14mm,9.84 in (250mm) x 5.51 in (140mm) U shack to lock and go! Locking your bike and your wheels with 10mm x 180cm cable, fast and easy with our quick. (2) 4 keys same keyed alike

✔️ AMAZING CONVENIENCE AND SECURITY – 4 keys for convenience! The bike U-locks comes with 4 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

【Anti-Theft】The lock cylinder is made of zinc alloy, more anti-drilling. The unlocking method is double-door unlocking, more higher anti-theft coefficient than single-door unlocking.The shape of the key is a serpentine groove, difficult to copy and more secure.

【Sturdy&Durable】Thinvik Bike U Lock which is cut-resistant,made of 18mm hardened max-performance steel shackle and eco-friendly silica gel,anti 12 tons of hydraulic shears,, leverage-resistant and drill-resistant, high quality alloy steel. Covered in a 0.10in silicone cover, the lock will stay protected from wear and tear, while also protecting your bike from scratches.hard to cut,break or pry open, strong and durable.

【Multi-Locked 】The unlocking method is double-door unlocking, more higher anti-theft coefficient than single-door unlocking.Length 4ft Thick 12mm high-quality steel cable combinate with U-lock,Steel cable can lock a bike to a bike frame or fence, tree or utility poles and so on.Making locking more flexible.

Sturdy and Durable: Heavy duty bicycle U lock is made of hardened max-performance steel shackle resists cutting and leverage attacks.

Easy and strong to lock your bike:The bike lock with 14mm U shack to lock and go! Locking your bike and your wheels with 10mm x 1200mm cable, fast and easy with our quick, no-hassle system.

Design & Performance: Silica gel layer coated protect the d-lock bike lock prevent scratched. Waterproof bike lock with mounting bracket, no extra packing required.

U-lock helps you store your bike more securely.Note: Measure your door's backset, cross bore and thickness to ensure you find the right fit.

Durable steel U-lock withstands 5,000 of cutting force for maximum theft deterrence

Vinyl cover on both U-Lock and cable allows for scratch free, weather resistant locking

130db Alarm

Heavy Duty Bike Lock

Weather Proof

【SECURITY 】 This Bike U-lock meets all your security needs: a Heavy Duty 14.6mm U-lock that is Durable and Easy to Use plus an 1800mm Cable that gives you solid security in every location. Suitable for gate/door/bicycles/e-bikes/motorcycles/scooters, etc.

【KEYLESS】 Choose JOYTUTUS bike u lock combination, 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. It is recommended that you can take a photo after changing the code, in case you forget the code and cannot unlock it.

【STURDY】This u bike lock is made of plastic on the outside and a 14.6mm hardened high-performance alloy steel cylinder on the inside, which can resist cutting and lever attacks, increasing the sturdiness and durability of the lock.

【Heavy Duty Bike Lock】It is made of 0.73 inch high quality alloy steel, which is cut, lever and drill resistant. Covered with a 0.10 inch silicone cover, the heavy-duty anti-theft bike key lock will stay protected from wear and tear while also protecting your bike from scratches.

【SECURITY ANTI-THEFT】The bike lock has a built-in zinc alloy lock cylinder that is certified to resist lever attacks and has excellent anti-theft performance, so your bike will get the best security protection.

【Portable U-Lock】This scooter U-lock is heavy enough to keep your bike safe, but light enough to carry. It measures 4.8*7.08 inches and is widely used for mountain bikes, road bikes and folding bikes, providing you with high quality bike security protection.

KEYS-FREE: bike combination U lock for security of your, motorcycle, electric scooter, gate. No more worry for forgetting keys with bike locks with combination.

COMBINATION: A strong combination u lock with easily setup to your own 4 numbers combo by the fist use. Smooth dials turning gives you confidence for quality.

STRONG SHACKLE: The 10 mm hardened zinc alloy shackle resists both cutters and leverage attacks. 4mm PVC coating paddle lock protects the lock from any scratching. Good gate locks for metal fence.

Keyed U-Lock

Hardened Steel Shackle

2 Keys