Patent ID: 7699329
Filing Date: 2010-04-20
Classification: B62M

Abstract:
1. A bicycle transmission assembly mountable to a bottom bracket shell of a bicycle frame, the bottom bracket shell having an axis, the bicycle transmission assembly comprising: an input crank assembly; an output chainring for engaging a bicycle drive chain including a plurality of chain links; a planetary gear mechanism including a plurality of planet gears and a ring gear having teeth engaging the plurality of planet gears, the planetary gear mechanism mounted coaxially about the shell axis and providing a plurality of transmission paths; a control system operatively connected to the planetary gear mechanism for selecting one of the plurality of transmission paths; and a mounting system for mounting the planetary gear mechanism and the control system to the bottom bracket shell, at least one chain link overlapping the teeth of the ring gear as viewed along the shell axis, the output chainring nonrotatably connected to the ring gear.