Hardtail mountain bike cross country bike type mens model 2016 series bergamont revox frame material aluminium frame alloy 6061 aluminium bike frame size inch 15 inch bike frame sizes cm 42 47 51 56 37 cm suspension system coil suspension fork feature preload adjust gear system with derailleur number of gears 30 rear derailleur shimano deore xt derailleur model shimano m781 front derailleurs shimano deore shimano fd m610 crankset shimano fc