Press-Fit Bottom Brackets

The new way in bottom brackets. The previous best idea was the external bottom bracket cup that allowed for wide-spaced and large bearings to be used. The change with the BB30 system is that basically the bearings stay about where they were but the frame comes out to cover them. They've gotten bigger also, requiring a 30mm diameter bottom bracket axle. The BB30 bearings press-fit directly into the frame for a simpler, more rigid and lighter system.

Shimano BB-MT800-PA Press Fit 89.5/92mm

Shimano SM-BB91 Press Fit MTB 42mm

Shimano SM-BB92 Dura-Ace for 41mm

Shimano SM-BB94 Press Fit BB MTB 41mm

SRAM Bottom Bracket Pressfit 30