Neumático de rueda trasero 12 mm 80/100-12 3,00-12 110cc 125cc Pit Dirt Bike Apollo SSR SDG
12mm Wheel Rim 80/100-12 3.00-12 Tire Dirt Pit Bike SSR Coolster Taotao 110 125. The bearing is 12mm,you can just take away the seal ring on bearing, you will see the model print on it, search it you will know it is 12mm or 15mm.