10 Best Kids Bike Locks 2025 in the United States

The NDakter Bike Chain Lock offers a secure 5-digit combination lock, which is generally safer than locks with fewer digits. This is ideal for kids who might struggle with managing keys. The lock's zinc alloy cylinder and alloy steel chain provide durability and resistance to tampering, although no lock is entirely theft-proof. The chain is wrapped in a scratch-proof polypropylene fabric that protects the bike's frame and extends the lock's lifespan.

The lock is conveniently keyless, allowing kids to set their own codes from 10,000 combinations, reducing the risk of losing keys. At 3.2 feet long and weighing around 1.5 pounds, it is substantial enough to lock multiple bikes or secure a bike to various objects, albeit potentially cumbersome for younger children to handle. The lock's diameter may not fit through smaller wheel gaps of scooters or e-bikes, but it can still secure them by wrapping around.

It’s a versatile lock suited for bikes, scooters, and more, with a good balance of security and ease of use, making it a strong choice for kids' bike locks. Parents should be aware of its weight and size, which might be difficult for smaller children to manage independently.

The OnGuard Mastiff 6 ft Chain Lock is a heavy-duty chain lock that offers strong protection thanks to its 10 mm hardened steel hex links and titanium reinforcement. At 70 inches long, it’s long enough to secure multiple bikes or larger vehicles, which might be more than needed for just kids’ bikes but great for families with various bikes. The quad lock system attached to the chain is designed to resist twisting, pulling, and prying, providing a high level of security against theft.

The lock uses a Z-cylinder core with five laser-cut keys, including one with an LED light, making it easier to use in the dark. While the lock is robust and well-built, it’s also quite heavy—over 10 pounds—which could make it less convenient for younger kids to handle on their own. The protective nylon sleeve helps prevent scratches on bike frames, which is a nice touch to keep bikes looking good.

This lock is larger and heavier compared to simpler kids’ bike locks, so it is better suited for older kids or parents who want tougher security, especially in urban areas or places with higher risk of theft. If you prioritize strong security and don’t mind the extra weight, this lock represents a solid choice. For younger kids or those looking for something lightweight and easy to carry, a smaller lock might be easier to manage.

The OnGuard RockSolid U-Lock is designed with strong security features, making it a reliable choice for protecting kids' bikes. Its 14mm thick alloy steel shackle is tough and resistant to cutting and sawing, which is important for preventing theft. The lock uses a pin tumbler mechanism with an X4P locking system that secures the shackle at four points, offering good resistance to pulling and prying attacks. One standout feature is its proprietary coating that helps resist angle grinder attacks, a tool some thieves might use. Despite its sturdy build, the lock remains fairly lightweight at 3 pounds, making it easier for kids or parents to carry and use without too much hassle. The size (3.5” x 6.9”) is standard for U-locks and fits most bike frames well without being too bulky.

While strong, this lock may still be a bit heavy for very young children to handle comfortably on their own. It also focuses on high security more typical of adult or motorcycle locks, which might be more than needed for casual kids' bike use. The locking mechanism is secure but might require some practice for kids to use smoothly. Additionally, the lock comes with five keys, which is handy, but losing them could be problematic as it's a pin tumbler lock. This lock is well-suited for parents seeking a heavy-duty, cut-resistant lock for kids' bikes, especially in areas where theft risk is higher. Its durability and security features are top-notch, but if ease of use and lightness are a priority for younger children, a simpler or lighter lock might be worth considering.