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Universal Compatibility: Stabiliser wheels designed for 12", 14", 16", 18" and 20" bicycles to accommodate various bike sizes Learning Aid for Beginners: Designed to help beginners become familiar with cycling and gradually learn how to balance on a bicycle Durable Construction: High quality steel bracket arms provide a safe and secure connection to the bicycle frame Quick Installation: Easy installation process should take no longer than 10 minutes with simple assembly steps Precise Specifications: Wheel diameter 109.3 mm (4.3 inches), central hole diameter 10 mm (0.39 inches), tyre width 25 mm (0.98 inches), with 5 fixing holes Adjustable Support System: Multiple hole locations on the support bar allow for proper adjustment according to bike size and wheel dimensions