An elegant, lightweight and trouble-free solution for adapting 24mm standard cranks to new BB30-standard frames. The BB30 Shim adapts 24mm Shimano Hollowtech II or SRAM GXP cranks to work on BB30 frames. Simply tap the adapters into the 6806 bearing in the BB shell, install the spindle and cranks. Machined engineering-grade Delrin.
The BB30 bottom bracket system uses a 68mm (road) or 73mm (mtb) wide shell and a 30mm diameter crank spindle. The frame's bottom bracket shell itself is not threaded; instead the bearings press directly into the frame. BB30 frame shell inner diameter is 42mm, has two bearing retaining clips and two SB-6806 bearings pressed directly in the shell. The BB30 system uses thin spacers and/or a wave washer between the bearings and the crank arms to take up any slack and micro-adjust the chainline of the crank.