The SRAM BB30 Bearing Assembly is the replacement kit for anyone running a BB30 crankset in a BB30 or BBright frame who needs to refresh worn bearings or is installing a SRAM/Truvativ crank into a compatible shell for the first time. The kit is a 42x30x7mm cartridge bearing assembly for use with a BB30 crankset in a BB30 frame with appropriate bearing and c-clip seats, and it includes the bearing set with shields, c-clips, and wavy washer for bearing retention and tension. That's everything the frame side of the interface needs — the crank spindle drops through the bearings once they're pressed and clipped into place.

BB30 uses a 42mm shell ID pressed directly into the frame, with the bearings retained by c-clips seated in machined grooves rather than by threaded cups or a press-fit sleeve. Frame interface is BB30/BBright Direct Fit, spindle interface is BB30, bottom bracket shell ID is PF42, and shell widths covered are 68mm, 73mm, and 79mm. The wavy washer sits between one bearing and its c-clip to preload the system and take up any manufacturing tolerance in the shell width, which is what keeps things quiet and prevents the bearings from developing play as the frame settles.

Compatibility is narrower than it looks at first glance. This assembly fits SRAM and Truvativ BB30 cranksets running a 30mm aluminum spindle — it is not a DUB bottom bracket and will not accept a DUB 28.99mm spindle, and it is not a PressFit 30 setup where the bearings live inside plastic cups pressed into a larger shell. If your frame has c-clip grooves machined into a 42mm shell, this is the direct replacement. If your frame is PF30, BB86, or threaded, you need a different bottom bracket entirely.... Read More