Machined engineering-grade Delrin inserts for adapting bottom brackets to a different type of crankset spindle.

• Adapts 24mm Spindle Cranks (Shimano, FSA, etc.) to work on Pressfit 30 frames
• Delrin adaptors fit between bearings and crank spindle
• Not compatible with SRAM PF30 bottom brackets that use a thin plastic reducer instered into the bearings