Shimano ultegra di2 r8050 11 speed front mechthe shimano ultegra di2 r8050 11 speed front mech has been redesigned for a wider gear pitch without sacrificing shifting performance with guaranteed quick and smooth shifting even when under heavy load such as climbing out of the saddle the step up to this ultegra di2 r8050 11 speed front mech is a game changer smart synchronised shiftingutilising shimanos innovative synchronised shift the front derailleur automatically shifts when the rear de