2PCS Universal Bicycle Stabiliser Extension Bolts, 3/8" Thread Axle Extenders for Kids Geared Bikes 12"-20", Heavy Duty Training Wheel Support Bolts Mountain & Bicycles - Silver

【Perfect Solution for Geared Bikes】 Specifically designed for children's bicycles with gears. These extension bolts extend your bike's axle length past the rear derailleur, allowing you to securely fit stabilisers without interference from the gear system. 【Universal Fit & 3/8" Thread】 Featuring a standard 3/8" thread, these axle extenders are compatible with most kids' bikes ranging from 12" to 20" wheels. Ideal for upgrading from single-speed to multi-speed bikes while maintaining balance support. 【Heavy-Duty & Durable Material】 Constructed from high-strength, anti-rust metal, our stabilizer bolts are built to withstand daily use. The sturdy design ensures long-term safety and stability for your child's riding journey. 【Easy Tool-Free Installation】 Simple and efficient. Just remove the original axle nut on the gear side and replace it with our extension bolt. No complex tools required, making it a "must-have" accessory for a custom bike configuration. 【Enhanced Safety & Stability】 Package includes 2 PCS (1 pair) of extension bolts. By widening the support base, these adapters provide a rock-solid foundation for training wheels, giving young riders the confidence they need to master their bike.