Racing bike type mens geometry sloping comfort frame sizes xl l s m bike frame sizes cm 48 51 54 56 58 61 cm colour grey model 2017 series cannondale synapse carbon frame material carbon fork material carbon gear systems with electronic gear shifting with derailleur number of gears 22 rear derailleur shimano ultegra di2 derailleur model shimano 6870 front derailleur shimano ultegra di2 crankset cannondale hollowgram si front chain wheel