10 pcs Bicycle Ball Bearing Cycling Headset Bearing with 20 Balls Handlebar Bearings for Mountain Bikes Fixed Gear Bicycle Crank Bottom Bracket Replacement Parts

Outer diameter: 40 mm/1.57 inches, ball diameter: 4 mm/0.15 inches. Please check the size matches the frame of your bicycle bearing before ordering. Widely used: suitable for mountain bikes and fixed gear bike. Function: This ball bearing inlaid in the holder design, it is a bicycle parts. Used to replace the bicycle crankbearing. Material: Made of metal, strong and durable, it can be used for a long time. What you get: you will receive 10 pieces of bicycle front fork ball bearings to meet your daily needs.