Shimano XTR SM-BB93 Bottom Bracket $39.95
XTR. These three letters stand for Shimano's best, even with components as simple as modern Bottom Brackets like the M-BB93. This English-threaded BB is incredibly light, sealed for mucky conditions, and spins freely for top performance. It fits 24mm crank spindles and comes with spacers for compatibility with 68mm and 73mm shells.