Cross country bike hardtail mountain bike type mens model 2017 series cube attention frame material aluminium frame alloy 6061 aluminium frame characteristics internal cable routing bike frame sizes inch 17 14 18 inch bike frame sizes cm 43 36 46 cm headset cube no 10 suspension system coil suspension fork feature preload adjust suspension fork technology rock shox poploc gear system with derailleur number of gears 30 rear derailleur shimano