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#1
Winner
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
The Sportneer Bike U Lock is a solid choice for bike owners looking for reliable protection against theft. Its 17mm thick shackle, made from strong alloy steel, offers good resistance against common break-in tools like saws and drills. The lock uses a key mechanism with a zinc alloy core, which tends to be more secure than simple combination locks. Weighing about 2.86 pounds and measuring roughly 9 x 5.7 inches, it is portable but sturdy enough to deter thieves. The included 5-foot steel cable adds versatility, letting you secure not only the bike frame but also wheels or multiple bikes to fixed objects. The silicone coating on the lock body helps prevent scratches on your bike, and its water and dust resistance means it holds up well outdoors. Mounting is made easy with the sturdy bracket that fits a range of bike tube sizes, making transport convenient.
Rating
10.0
Chosen by1,240
Shackle Thickness
Locking Mechanism
Size
Most important from
3579 reviews
#2
Sportneer Bike Lock: Heavy Duty Anti Theft Bike U Lock with 5ft Security Steel Cable - 17mm Shackle Bicycle U-Locks with Keys & Sturdy Mounting Bracket for Road, Mountain, Electric & Folding Bike
The Sportneer Bike Lock combines portability with robust security, making it a great choice for various types of bicycles including road, mountain, electric, and folding bikes. Crafted from durable materials such as PVC, alloy steel, silicone, and zinc, it provides excellent resistance against water, dust, and dirt. The 17mm thick shackle and a lock core that can withstand hydraulic shear forces up to 12 tons ensure high anti-theft protection against cutting, sawing, smashing, and drilling attempts.
Rating
10.0
Locking Mechanism
Mounting Options
Most important from
3579 reviews
#3
Master Lock Black Bike Lock with Key, Standard Size U-Lock for Bicycles and Other Outdoor Equipment, Anti-Theft Lock for Bikes, 8320D
The Master Lock 8320D is a solid choice for anyone looking for a reliable U-lock to secure their bike or outdoor gear. Its hardened alloy steel shackle and body are designed to resist common theft methods like cutting, sawing, and prying, which adds a good layer of security. The double-locking mechanism improves pry resistance, and the integrated disc-key lock offers strong protection against picking.
Rating
9.8
Material
Locking Mechanism
Size
Most important from
4668 reviews
Top 10 Best U Locks 2025 in the United States
#1
Winner
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
Chosen by 1240 this week
Sportneer Bike Lock: Heavy Duty Anti Theft Bike U Lock with 5ft Security Steel Cable - 17mm Shackle Bicycle U-Locks with Keys & Sturdy Mounting Bracket for Road, Mountain, Electric & Folding Bike
Sportneer Bike Lock: Heavy Duty Anti Theft Bike U Lock with 5ft Security Steel Cable - 17mm Shackle Bicycle U-Locks with Keys & Sturdy Mounting Bracket for Road, Mountain, Electric & Folding Bike
Material: PVC, Alloy Steel, Silicone, Zinc, Steel
Shackle Thickness: 17mm
Locking Mechanism: Key Lock
Size: 7.76 x 5.02 inches
Weight: 1.64 lbs
Mounting Options: Fits bike tubes 1.02 to 1.5 inches
Master Lock Black Bike Lock with Key, Standard Size U-Lock for Bicycles and Other Outdoor Equipment, Anti-Theft Lock for Bikes, 8320D
Master Lock Black Bike Lock with Key, Standard Size U-Lock for Bicycles and Other Outdoor Equipment, Anti-Theft Lock for Bikes, 8320D
Material: Vinyl, Alloy Steel
Locking Mechanism: double-locking, integrated disc-key lock
Size: 7¼ inches
Weight: just over 2 pounds
Mounting Options: bracket for bike frame mounting
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
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”
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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
Via Velo Bike U-Lock with Cable, Heavy Duty Anti-Theft Bicycle U Locks with 8mm Braided Steel and 3 Keys, 4ft Length Security Cable for Bike, Scooter Mountain Road Bike
Via Velo Bike U-Lock with Cable, Heavy Duty Anti-Theft Bicycle U Locks with 8mm Braided Steel and 3 Keys, 4ft Length Security Cable for Bike, Scooter Mountain Road Bike
Material: Hardened Steel
Shackle Thickness: 9 mm
Locking Mechanism: KEY LOCK
Size: 7.25 x 8 x 0.5 inches
Mounting Options: mounting bracket
Kryptonite Kryptolok Standard Bike U-Lock with Cable, Heavy Duty Anti-Theft Bicycle U Lock, 12.7mm Shackle and 10mm x 4ft Length Security Cable with Mounting Bracket and Keys
Kryptonite Kryptolok Standard Bike U-Lock with Cable, Heavy Duty Anti-Theft Bicycle U Lock, 12.7mm Shackle and 10mm x 4ft Length Security Cable with Mounting Bracket and Keys
Material: Alloy Steel
Shackle Thickness: 12.7mm
Locking Mechanism: Keyed Lock
Size: 4.02 x 4.02 x 9.02 in
Weight: 2.9 pounds
Mounting Options: Flexframe-U bracket mount
Bike U Lock with Cable - Via Velo Heavy Duty Bicycle U-Lock,14mm Shackle and 10mm x1.8m Cable with Mounting Bracket for Road, Mountain, Electric & Folding Bike
Bike U Lock with Cable - Via Velo Heavy Duty Bicycle U-Lock,14mm Shackle and 10mm x1.8m Cable with Mounting Bracket for Road, Mountain, Electric & Folding Bike
Material: Hardened steel, Sold Secure Bronze
Shackle Thickness: 14mm
Locking Mechanism: Pin Tumbler
Size: 8 x 10 inches
Weight: 3 pounds
Mounting Options: Bracket for bike tubes 20-42mm
#10
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
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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.