Racing bike type ladies geometry sloping comfort frame sizes s m l bike frame sizes cm 44 48 51 54 57 cm colour black model 2017 series specialized dolce frame material aluminium fork material carbon gear system with derailleur number of gears 20 rear derailleur shimano tiagra front derailleur shimano tiagra gear shift brake lever shimano tiagra sti crankset praxis alba 2d front chain wheel teeth 4832 cassette shimano tiagra rear