Wheels Manufacturing T47 Ouboard Bottom Bracket Angular Contact Bearings 22/24mm SRAM/GXP SpindlesWheels Manufacturing T47 Ouboard Bottom Bracket with Angular Contact Bearings for 22 24mm (SRAM GXP) Spindles. T47 Outboard threaded bottom brackets are made from machined aluminum and thread together directly into T47 frames. Cups have outboard bearings and are typically used in BB shells with widths from 68mm to 100mm. Enduro Angular Contact bearings easily serviced or replaced Similar to standard BSA threaded cups; the drive side cup is left hand