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10 Best D Locks 2025 in the United States

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Our technology thoroughly searches through the online shopping world, reviewing hundreds of sites. We then process and analyze this information, updating in real-time to bring you the latest top-rated products. This way, you always get the best and most current options available.

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Our Top Picks

#2

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

Rating
9.8
Shackle Thickness
Size and Weight
Security Rating

Most important from
13298 reviews

Shackle Thickness
The lock feels super robust, though the shackle is small and can be a bit tricky to lock anywhere without the wire.
Size and Weight
The mini size is great for small framed bikes, especially on a college campus, but be mindful it might be too small to lock both a wheel and frame to a solid support.
Security Rating
The Kryptonite Evolution Mini-7 is quite stout and any thief will at least need to work a little and carry the proper tools.
Mounting Bracket
The included FlexFrame U-bracket offers nice frame mount options, making it easy to fix to the bike frame.

The Kryptonite Evolution Mini-7 Bike U-Lock is a robust and secure option for cyclists looking to protect their bikes. One of its major strengths is the 13mm hardened steel shackle, which resists bolt cutters and leverage attacks, significantly boosting security. Additionally, the disc-style cylinder is both pick and drill resistant, further enhancing its anti-theft capabilities.

The lock also comes with a 4ft 10mm steel cable, providing extra security for wheels or accessories. With a weight of 3.55 lbs, it's solid but may be a bit heavy for some users to carry around regularly. However, the included FlexFrame U-bracket offers a convenient mounting solution, allowing easy transport attached to the bike frame. Users will appreciate the three stainless steel keys, reducing the risk of being locked out if one gets lost.

Another notable feature is the optional Anti-Theft Protection Offer, which can cover up to $2,500 in case the lock is defeated. Despite its many strengths, the lock's smaller size (3.25 x 7 inches) may not fit all bike frames or locking situations. The mini size enhances portability but might limit flexibility in securing larger bikes or objects. The Kryptonite Evolution Mini-7 is a durable and high-security lock ideal for urban cyclists or anyone needing a strong, reliable lock for various uses.

Rating
9.8
Shackle Thickness
Size and Weight
Security Rating

Most important from
13298 reviews

Shackle Thickness
The lock feels super robust, though the shackle is small and can be a bit tricky to lock anywhere without the wire.
Size and Weight
The mini size is great for small framed bikes, especially on a college campus, but be mindful it might be too small to lock both a wheel and frame to a solid support.
Security Rating
The Kryptonite Evolution Mini-7 is quite stout and any thief will at least need to work a little and carry the proper tools.
Mounting Bracket
The included FlexFrame U-bracket offers nice frame mount options, making it easy to fix to the bike frame.
#3

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

Rating
9.6
Locking Mechanism
Size and Weight
Security Rating

Most important from
3305 reviews

Locking Mechanism
The key with a blue light and the ability to insert the bottom piece on either end are nice touches.
Size and Weight
The lock has some weight to it but nothing that would be considered crazy.
Security Rating
This lock is a huge step up from my old random chain lock. The product feels super secure, making it worth the price to protect my electric scooter.
Material
It is a very sturdy U-lock, although the U part is shorter compared to older models.

The Kryptonite New York Fahgettaboutit Mini Bike U-Lock is designed to offer top-notch security for bikes, e-bikes, and other valuable equipment. Built with an 18mm hardened max-performance steel shackle, it excels in resisting cutting and leverage attacks. The patented double deadbolt locking system further enhances its resistance against twist attacks, making it highly reliable for preventing theft.

The lock is compact but substantial, with dimensions of 9.06 x 5.98 x 1.18 inches and a weight of 4.55 lbs, which indicates it is quite heavy and may add significant weight to your bike setup. It includes three keys and offers a high-security disc-style cylinder that is resistant to picking and drilling, which is crucial for ultimate security. The lock has a security rating of 10/10 from Kryptonite, indicating it provides the highest level of protection. The material used is durable steel, and it comes with a protective vinyl coating to prevent damage and corrosion.

The U-lock shape typically allows for easy mounting on bike frames using compatible brackets. Additionally, the lock is eligible for Kryptonite’s Anti-Theft Protection Offer (ATPO) with coverage up to $5,000, providing added peace of mind. Users benefit from the Key Safe Program, which offers free key replacements if they are lost. A lifetime warranty and customer support from Kryptonite ensure reliability and satisfaction. The weight might be a drawback for those who prioritize portability and ease of transport. Users looking for ultimate security for their bicycles and other equipment will find this lock extremely effective, but may need to consider its heft in daily use.

Rating
9.6
Locking Mechanism
Size and Weight
Security Rating

Most important from
3305 reviews

Locking Mechanism
The key with a blue light and the ability to insert the bottom piece on either end are nice touches.
Size and Weight
The lock has some weight to it but nothing that would be considered crazy.
Security Rating
This lock is a huge step up from my old random chain lock. The product feels super secure, making it worth the price to protect my electric scooter.
Material
It is a very sturdy U-lock, although the U part is shorter compared to older models.

Buying Guide for the Best D Locks

Choosing the right D-lock for your bike is crucial to ensure its safety and security. D-locks, also known as U-locks, are popular for their strength and resistance to cutting and leverage attacks. When selecting a D-lock, consider the following key specifications to find the best fit for your needs.
Shackle ThicknessThe shackle is the U-shaped part of the lock that goes around your bike frame and the object you are locking it to. Thicker shackles are generally more resistant to cutting and prying. Shackle thickness can range from around 12mm to over 18mm. For high-risk areas, a thicker shackle (16mm or more) is recommended, while lower-risk areas might be adequately served by a thinner shackle.
Locking MechanismThe locking mechanism is the part of the lock that secures the shackle in place. There are various types, including key-operated and combination locks. Key-operated locks are generally more secure, but you need to keep track of the key. Combination locks offer convenience as you don't need a key, but they can be less secure. Choose a locking mechanism based on your preference for convenience versus security.
Size and WeightD-locks come in various sizes and weights. Larger locks can secure more of your bike or multiple bikes, but they are heavier and less portable. Smaller locks are lighter and easier to carry but may not fit around larger objects. Consider where and how you will be locking your bike to determine the right balance between size and portability.
Security RatingMany D-locks come with a security rating provided by independent testing organizations. These ratings can help you gauge the lock's effectiveness against theft. Higher ratings indicate better security. If you live in a high-theft area or leave your bike unattended for long periods, opt for a lock with a higher security rating.
MaterialThe material of the lock, usually hardened steel, affects its durability and resistance to attacks. Hardened steel is the most common and effective material, but some locks may use other materials or coatings to enhance strength. Ensure the lock is made from high-quality materials to provide the best protection for your bike.
Mounting BracketA mounting bracket allows you to attach the lock to your bike frame when not in use, making it easier to carry. Not all D-locks come with a mounting bracket, so if portability is important to you, look for a lock that includes one. This feature can be particularly useful for daily commuters.

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