Shimano

XTR BB94 Bottom Bracket

Along with BB86, this Shimano XTR BB94 Bottom Bracket is part of the new pressfit standard, and is compatible with frames that have a BB92 bottom bracket shell. The reason it's called a BB94 is because of a recent round of upgrades to the bearings, but it is still built to fit the BB92 standard of bottom bracket shells. The BB92 standard offers frame designers a little more room for new designs in seat/down tubes and rear suspension layout. Where a typical mountain bike has a 68 or 73mm bottom bracket shell width, a BB92 equipped bike has a shell that measures 91.5mm wide. A BB92 shell lacks internal threads and has a 41mm inside diameter.

The BB94 model is made to press right into your bike, and mates with Shimano Hollowtech II cranksets. This bottom bracket comes with two steel cartridge bearings pressed into composite cups, which increase the outside diameter of the assembly to 41mm to match the internal diameter of the frame's bottom bracket shell. A 1.75mm thick outer lip provides a positive stop for the cups when you press them into place. Shimano includes its standard plastic o-ringed inner sleeve to protect against water damage should it find a way inside your frame, and a black plastic dust shield snaps into the inner race of each bearing for an extra layer of protection against the hardships of the trail.