BULLSPANN Ball Bearing Cage Crank Bearing Wheel Bearing Retainer for

• [Material] This ball bearing retainer is made of stainless steel, durable and strong. • [Dimensions] Outer diameter: 40mm, Inner diameter: 31mm, Package contents: Bicycle ball bearing x 2 pieces. • [Features] This ball bearing retainer has 22 balls and is suitable for 31mm inner diameter parts.An ideal replacement for your bicycle. • [Application] This kind of bead rack stainless steel ball is fitted into a retainer design.Suitable for replacing bicycle crank bearings.Suitable for general bicycles, mountain bikes, low rider bikes, and stretch bikes. • 【Note】Please check whether the size of your bicycle accessories matches these bearing cages before purchasing.