Shimano 105 Octalink V1 Bicycle Bottom Bracket - BB-5500 By: ShimanoNo Longer Available Best possible value in an Octalink V1 bottom bracket. Aluminum cups and chromoly spindle. Splined ends provide a more rigid, non-loosening crank assembly. 250 grams.
Shimano 105 Hollowtech II External Bearing Bicycle Bottom Bracket - FC-5600 By: ShimanoNo Longer Available HOLLOWTECH 2: Optimum balance of lightweight and rigidity. Outboard bearings provide additional stability. Minimal bearing interface for smoother rolling. Q-factor remains same as FC-5500/BB-5500. 98 grams.