Chris King bottom brackets utilize Fit Kits to ensure that cranks mate perfectly with our precision bearings, extend product life, and reduce the potential for noise. Fit Kits will also allow you to use one bottom bracket with a wide array of cranks, if you happen to change you cranks in the future.Fit Kit #4 (PBB084) for cranksets with 24mm spindles.Fit Kit #6 (PBB086) for SRAM GXP cranks.Specifications:- For use with ThreadFit™ 24, ThreadFit™ T47 24i, ThreadFit™ T47 24x- 68mm, 73mm, 73mm SB+, 86.5mm, 92mm, and 92mm SB+ BB shells.- Common Cranks: Shimano, SRAM GXPSmall Parts Kit (PBB010) for 68mm shells with 24mm spindle MTB cranks:- 1mm spindle spacers x8- 0.35mm spindle spacers x3- 2.5mm cup spacers x2