Racing bike type mens geometry classic racing frame sizes xs s m l bike frame sizes cm 44 48 51 54 56 58 cm colour black model 2017 frame material aluminium fork material carbon gear system with derailleur number of gears 20 rear derailleur shimano tiagra gear shift brake lever shimano tiagra crankset fsa omega front chain wheel teeth 5034 bottom bracket bb30 cassette shimano hg500 rear chain wheel teeth 11 28 chain fsa cn 910