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#1
Winner
OnGuard RockSolid U-Lock – Angle Grinder Resistant 14mm Hardened Steel Bike Lock with X4P Quad Locking Mechanism, Lightweight Anti-Theft Design, Includes 5 Keys & Theft Protection, 3.5” x 6.9”
The OnGuard RockSolid U-Lock is designed to offer high-level security for bicycles, motorcycles, and powersport vehicles. Its standout feature is the angle grinder resistant coating, which provides robust protection against common theft methods. The 14mm steel shackle is strong and durable, making it resistant to cutting and sawing attacks. Additionally, the X4P locking mechanism secures the shackle at four points, enhancing its defense against pulling, jacking, and prying attempts.
Rating
10.0
Chosen by1,410
Material
Shackle Thickness
Locking Mechanism
Most important from
58 reviews
#2
Kryptonite New-U New York Standard Heavy Duty Bicycle U Lock & Keeper 785 Integrated Chain Lock, 16mm Steel Shackle, 33.5-Inch, Black/Yellow, Grey, Purple, Red
The Kryptonite New-U New York Standard Heavy Duty Bicycle U Lock is a robust option for securing bicycles, featuring a 16mm hardened max performance steel shackle. This makes it highly resistant to hand tools, bolt cutters, and leverage attacks, ensuring maximum security. It comes in multiple colors, giving users some aesthetic flexibility. The interior locking dimensions are 4” x 8”, offering ample space for various locking scenarios.
Rating
9.4
Locking Mechanism
Weight
Most important from
4670 reviews
#3
Hiplok Dx1000 Anti Angle-Grinder U-Lock Black, One Size
The Hiplok Dx1000 U-Lock is designed to offer robust security for your bicycle, making it a solid choice for those looking to protect their investment. One of its standout features is the graphene reinforced premium hardened steel shackle, which enhances resistance against cutting and drilling attacks. This is crucial for users who park their bikes in high-risk areas. The lock's anti-drill mechanism further boosts its security profile, ensuring that potential thieves have a tough time getting through it.
Rating
9.1
Material
Size
Mounting Options
Most important from
90 reviews
Top 10 Best U Locks 2025 in the United States
#1
Winner
OnGuard RockSolid U-Lock – Angle Grinder Resistant 14mm Hardened Steel Bike Lock with X4P Quad Locking Mechanism, Lightweight Anti-Theft Design, Includes 5 Keys & Theft Protection, 3.5” x 6.9”
OnGuard RockSolid U-Lock – Angle Grinder Resistant 14mm Hardened Steel Bike Lock with X4P Quad Locking Mechanism, Lightweight Anti-Theft Design, Includes 5 Keys & Theft Protection, 3.5” x 6.9”
Material: Steel
Shackle Thickness: 14mm
Locking Mechanism: X4P mechanism
Size: 3.5” x 6.9”
Weight: 3 Pounds
Chosen by 1410 this week
Kryptonite New-U New York Standard Heavy Duty Bicycle U Lock & Keeper 785 Integrated Chain Lock, 16mm Steel Shackle, 33.5-Inch, Black/Yellow, Grey, Purple, Red
Kryptonite New-U New York Standard Heavy Duty Bicycle U Lock & Keeper 785 Integrated Chain Lock, 16mm Steel Shackle, 33.5-Inch, Black/Yellow, Grey, Purple, Red
Material: Vinyl, Stainless Steel, Steel
Shackle Thickness: 16mm
Locking Mechanism: Key Lock
Size: 4” x 8”
Hiplok Dx1000 Anti Angle-Grinder U-Lock Black, One Size
Hiplok Dx1000 Anti Angle-Grinder U-Lock Black, One Size
Material: Graphene reinforced steel
Locking Mechanism: Anti-drill
Size: 290mm length, 205mm x 112mm
Weight: 5.75 pounds
Mounting Options: Limited
Sportneer Bike U Lock - Heavy Duty Anti Theft Bike Lock with 5ft Security Steel Cable - 17mm Shackle Bicycle U-Locks with Keys & Sturdy Mounting Bracket for Road, Mountain, Electric Bike - Orange
Sportneer Bike U Lock - Heavy Duty Anti Theft Bike Lock with 5ft Security Steel Cable - 17mm Shackle Bicycle U-Locks with Keys & Sturdy Mounting Bracket for Road, Mountain, Electric Bike - Orange
Material: alloy steel
Shackle Thickness: 17mm
Locking Mechanism: key lock with zinc alloy core
Size: 9 x 5.7 inches
Weight: 2.86 pounds
Mounting Options: bracket fits various bike tube sizes
Kryptonite New York Standard Bike U-Lock, Heavy Duty Anti-Theft, 16mm Shackle with Mounting Bracket and Keys, Ultimate Security for Bicycles E-Bikes Scooters
Kryptonite New York Standard Bike U-Lock, Heavy Duty Anti-Theft, 16mm Shackle with Mounting Bracket and Keys, Ultimate Security for Bicycles E-Bikes Scooters
Material: Alloy Steel
Shackle Thickness: 16mm
Locking Mechanism: Deadbolt
Size: 4" x 8"
Weight: 4.5 pounds
Mounting Options: Flexframe-U bracket
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Hiplok D1000 Unisex Shackle Lock
Hiplok D1000 Unisex Shackle Lock
Material: Patented Ferosafe, hardened steel core
Locking Mechanism: Key Lock, Electronic Lock
Size: 8.86 x 6.1 x 1.57 inches
Weight: 3.97 pounds
Kryptonite New York Fahgettaboutit Mini Bike U-Lock, Heavy Duty Anti-Theft Bicycle U Lock, 18mm Shackle with Keys, Ultimate Security Lock for Bicycles E-Bikes Scooters,Black
Kryptonite New York Fahgettaboutit Mini Bike U-Lock, Heavy Duty Anti-Theft Bicycle U Lock, 18mm Shackle with Keys, Ultimate Security Lock for Bicycles E-Bikes Scooters,Black
Material: Steel
Shackle Thickness: 18mm
Locking Mechanism: Double deadbolt, high-security disc cylinder
Size: 3.25” x 6” interior
Weight: 4.55 lbs
Kryptonite Evolution Mini-7 Bike U-Lock with Cable, Heavy Duty Anti-Theft Bicycle U Lock, 13mm Shackle and 10mm x4ft Length Security Cable with Mounting Bracket and Keys
Kryptonite Evolution Mini-7 Bike U-Lock with Cable, Heavy Duty Anti-Theft Bicycle U Lock, 13mm Shackle and 10mm x4ft Length Security Cable with Mounting Bracket and Keys
Material: Steel
Shackle Thickness: 13mm
Locking Mechanism: U-Lock
Size: 3.25 x 7 inches
Weight: 3.55 lbs
Mounting Options: FlexFrame-U bracket
Seatylock Mason Bike U Lock - Patented Heavy Duty Anti Theft Diamond Security Bicycle Lock - Super Wide Safety Master Tool ULock with Keys for Electric Bikes Scooters and Motorcycles (8.66 Inch)
Seatylock Mason Bike U Lock - Patented Heavy Duty Anti Theft Diamond Security Bicycle Lock - Super Wide Safety Master Tool ULock with Keys for Electric Bikes Scooters and Motorcycles (8.66 Inch)
Material: Alloy Steel
Locking Mechanism: Patented Pentagonal Crossbars, Double Deadbolt
Size: 8.66 inch (22 cm)
Weight: 1.53 Kilograms
Mounting Options: No mounting bracket included
#10
Kryptonite New York Long Shackle Bike U-Lock, Heavy Duty Anti-Theft Security Bicycle Lock Sold Secure Gold, 16mm Long Shackle with Keys, Ultimate Security Lock for Bicycles E-Bikes Scooters
Kryptonite New York Long Shackle Bike U-Lock, Heavy Duty Anti-Theft Security Bicycle Lock Sold Secure Gold, 16mm Long Shackle with Keys, Ultimate Security Lock for Bicycles E-Bikes Scooters
Material: 16mm hardened steel
Shackle Thickness: 16mm
Locking Mechanism: double deadbolt, high-security cylinder
Size: 4 x 10.25 inches
Weight: 4.85 pounds
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Buying Guide for the Best U Locks
Choosing the right U-lock for your bike is crucial to ensure its safety and security. U-locks are known for their strength and resistance to cutting and leverage attacks, making them a popular choice among cyclists. When selecting a U-lock, it's important to consider several key specifications to find the best fit for your needs. Here are the main factors to consider and how to navigate them.MaterialThe material of a U-lock is important because it determines the lock's strength and resistance to cutting. Most U-locks are made from hardened steel, which is very difficult to cut through. Some high-end models may use materials like titanium for added strength and lighter weight. If you frequently park in high-theft areas, opt for a lock made from the strongest materials available. For less risky areas, a standard hardened steel lock should suffice.
Shackle ThicknessShackle thickness refers to the diameter of the U-shaped part of the lock. Thicker shackles are harder to cut or break. U-locks typically range from 12mm to 18mm in thickness. For high-risk areas, choose a lock with a shackle thickness of at least 16mm. For moderate-risk areas, a thickness of 12-15mm should be adequate. Consider the level of security you need based on where you usually park your bike.
Locking MechanismThe locking mechanism is the part of the lock that secures the shackle in place. There are various types, including key-based and combination locks. Key-based locks are generally more secure, especially if they use a disc-detainer or double deadbolt mechanism. Combination locks offer convenience but may be less secure. If security is your top priority, go for a key-based lock with a high-security mechanism. If you prefer convenience and are in a low-risk area, a combination lock might be suitable.
SizeThe size of the U-lock determines how easily you can lock your bike to different objects. Smaller locks are more portable and harder for thieves to leverage, but they may limit what you can lock your bike to. Larger locks offer more flexibility in terms of locking options but can be bulkier to carry. Consider where you usually park your bike and what you typically lock it to. If you need more flexibility, a larger lock might be better. If you prioritize portability and security, a smaller lock is ideal.
WeightThe weight of the U-lock can affect how easy it is to carry around. Heavier locks are usually more secure but can be cumbersome to transport. Lighter locks are easier to carry but may offer less security. If you commute long distances or need to carry the lock frequently, consider a lighter model. If your primary concern is maximum security and you don't mind the extra weight, a heavier lock is the way to go.
Mounting OptionsMounting options refer to how you can attach the lock to your bike when not in use. Some U-locks come with mounting brackets that allow you to attach the lock to your bike frame. This can be very convenient for transport. If you prefer not to carry the lock in a bag, look for a model with a reliable mounting system. Ensure the mounting bracket is compatible with your bike frame and easy to use.