Odyssey Dynatron Bottom Bracket Set 24TPI SilverThe Odyssey Dynatron Bottom Bracket Set is what you need for your single piece crank set that uses an American Bottom Bracket. These have a shielded mechanism that repels torque inhabiting dirt and water. The 12 ball bearing system provides smoother and more efficient operation. These fit 24 Threading. Contains 2 cups, 2 bearing retainers, 2 lock cones, 2 dust shields, 1 lock washer, 1 lock nut, and 1 chain ring spacer.630950090204