1 x Bike Bearing(MR22237). Bicycle Bike Bottom Bracket Bearings For-SRAM GXP. As bikes have front and rear wheels, so too have they front- and rear-specific hubs. The hub is the central part of your bike's wheels (front and rear), which connects to the wheel's rim via the spokes and through which the axle is fitted, enabling the wheel to freely spin on two sets of bearings.
