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 Bottom Bracket 69.5/92mm

Shimano Deore XT Press-Fit bottom bracket for BB shell widths of 89.5mm or 92mm.

Shimano SM-BB91 Press-Fit Bottom Bracket MTB 42mm

Shimano Press-Fit Bottom Bracket for mountain bikes. External diameter: 42mm.
Shipping Weight: 123g.

Shimano SM-BB92 Dura-Ace Press-Fit Bottom Bracket for 41mm

Shimano Press-Fit Bottom Bracket for road bikes. External Diameter: 41mm.
Shipping Weight: 91g.

Shimano SM-BB94 Press Fit Bottom Bracket MTB 41mm

Shimano Press-Fit Bottom Bracket for mountain bikes. External diameter: 41mm.
Shipping Weight: 93g.

SRAM Pressfit 30 Bottom Bracket

The difference between a BB30 bottom bracket and a Pressfit 30 bottom bracket (PF30) is that the PF30 has plastic sleeves outside of the bearings that press into the frame and then support the same bearings as the BB30 bottom bracket. So the frame BB diameter is larger for a PF30 bottom bracket.
Weight: 86g. Shipping Weight: 146g.