- Premium Quality PU Material : Our training bike features thickened wheels constructed from high-quality PU material designed for durability and shock absorption. With a wheel thickness of 2.5 cm—0.5 cm thicker than standard options—riders can enjoy a smoother, more comfortable experience with less effort. - Enhanced Stability with Double Bearings : The double carbon steel bearings have been optimized for quiet operation and extended longevity. An enlarged washer covers the entire bearing, ensuring stability and safety. Parents can have peace of mind knowing that the risk of sudden bearing detachment is minimized, allowing children to ride confidently. - Versatile Compatibility : This training wheel comes with a bracket featuring five adjustable holes, making it compatible with bicycles of sizes 12, 14, 16, 18, and 20 inches. This versatility solves the common problem of limited size compatibility in training wheels. - Practical Use Scenarios : 1. Perfect for young learners just starting to ride, providing the stability needed to build confidence. 2. Ideal for parents looking to upgrade their child's bike for enhanced safety without compromising on comfort. 3. A great choice for transitioning from training wheels to riding independently, thanks to its reliable design. Choose our training bike wheels for a safer, more enjoyable riding experience for your child.