1. Additionally, we have enlarged the washer to ensure it fully covers the entire bearing, providing a secure fit. This eliminates any concern about the bearing suddenly dislodging, which could cause your child to fall. They can play safely and grow up . 2. This jockey wheel, crafted from quality PU material, is the choice. The thicker 2.5 cm wheel (0.5 cm thicker than standard wheels) reduces unevenness, ensuring a smoother, more effortless ride with enhanced comfort. Featuring a double bearing and larger washer, our training bike's carbonrich bearings have been rigorously tested for smooth performance and extended wheel life. 3. Its rounded shape and attractive design blend seamlessly, resembling a lollipop, and add a vibrant touch to your child's colorful childhood. (Note: Suitable for variablespeed bicycles.) Thickened wheel with quality PU material We've prioritized finding quiet, durable bicycle wheels with shock absorption. 4. Universal diameter and adjustable sizing: Tired of stabilizers that only fit one bike size? No problem. Our stabilizers come with a bracket featuring 5 different holes, making them compatible with 12', 14', 16', 18', and 20' bicycles.