Why We Make It Chris King Fit Kits make that magical love connection between your cranks and our legendary bearings. Why You Want It Your Fit Kit extends the useful life of both your bottom bracket and your cranks, reduces the potential for noise, and also allows you to use one bottom bracket with a wide array of cranks, if that’s your jam. Fit Kit #3 (PBB083) for ThreadFit™ 30 with 30mm spindle cranksets. For use with ThreadFit™ 30 68mm, 73mm BB shells. Common Cranks: White Industries, SRAM, Race Face Fit Kit #5 (PBB085) for ThreadFit™ T47 30x and T47 30i with 30mm spindle cranksets. For use with ThreadFit™ T47 30x and T47 30i 68mm, 73mm BB shells. Common Cranks: White Industries, SRAM, Race Face