Convert your larger Bearings to the common 12 mm Axle. No Need to change bearings.
Convert your 5/8 or 15mm Bearings to 12mm.
6061 Aluminum.
Description
Bearing Reducer for Mini Bike Wheels. Convert your larger Bearings to the common 12 mm Axle. No Need to change bearings. 5/8 Inch to 12mm & 15mm to 12mm available. Machined from 6061 Aluminum.