12 Pack Ball Bearing Retainers for Bike Crank and Wheel 20.5mm Outer Diameter 13mm Inner Diameter 7 Balls Steel Cage Replacement Part for Bikes and Autos

12-Pack Steel Ball Bearing Retainers for Bicycle Cranks
✔️ Outer 20.5mm / 0.81", Inner 13mm / 0.51", 7-ball steel cage, 12-pack

This 12-pack set of steel ball bearing retainers is designed for bicycle crank and wheel assemblies. It replaces worn cages in bikes and autos, keeping seven balls aligned for smooth operation.

✅ Outer Diameter: 20.5mm / 0.81"
✅ Inner Diameter: 13mm / 0.51"
✅ 7-ball steel cage with seven balls
✅ Includes 12 pieces in pack

💡 What is a bicycle ball bearing retainer used for in crank and wheel assemblies? This handy piece helps keep the balls in place and reduces play in your bearings. - Keeps seven steel balls aligned inside the retainer - Fits 13mm inner diameter head parts used in bikes and autos - Replaces worn bearing cages in crank and hub assemblies