Racing bike type ladies geometry sloping comfort frame sizes l s m bike frame sizes cm 44 48 51 54 56 58 cm colour black model 2017 series specialized ruby frame material carbon fork material carbon gear system with derailleur number of gears 22 rear derailleur shimano 105 front derailleur shimano 105 gear shift brake lever shimano 105 sti crankset praxis alba 2d front chain wheel teeth 5034 cassette shimano 105 rear chain wheel