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However jaded youve become to the ever-constant changes in bottom bracket standards, the T47 threaded bottom bracket provides numerous benefits by providing custom frame builders and smaller bike companies with a creak-free, precisely aligned shell boasting the extra stiffness of oversized press fit shells. This particular Wheels Mfg T47 Threaded Bottom Bracket works with frames using the T47 threaded bottom bracket standard and accommodates a number of road and mountain bike cranksets with 30, 22/24, and 24-millimeter spindle diameters. Youll find 30-millimeter, SRAM GXP 22/24-millimeter, and Shimano 24-millimeter versions catering to a number of different cranksets. Each T47 bottom bracket is compatible with bottom bracket shell widths of 68 to 132 millimeters, most typically used in shell widths greater than 73 millimeters. Every bottom bracket has machined aluminum cups with internal bearings that are easily serviced or replaced. In specific, Wheels Mfg uses Enduro Angular Contact Bearings designed for bottom brackets by spreading forces over a larger surface area to decrease friction and minimize wear. Additionally, youll find an included sleeve that fits between the cups to keep out dirt and grime, as well as keep internal wires from rubbing against crank spindles.