2Pcs Bike Rear Derailleur Pulley Wheels 12T+16T Pottery Ball Bear Bearing For Sram Bicycle Rear Derailleur Guide Wheel Accessory

2Pcs Bike Rear Derailleur Pulley Wheels 12T+16T Pottery Ball Bear Bearing For Sram Bicycle Rear Derailleur Guide Wheel Accessory

Aliexpress UK