Racing bike type mens geometry sloping comfort frame sizes l s m bike frame sizes cm 48 51 54 56 58 61 cm colour black model 2017 series cannondale synapse carbon frame material carbon fork material carbon gear system with derailleur number of gears 22 rear derailleur shimano ultegra derailleur model shimano 6800 front derailleur shimano ultegra crankset cannondale hollowgram si front chain wheel teeth 5034 cassette shimano 105 rea