Cross country bike hardtail mountain bike 29 type mens model 2017 series cube attention frame material aluminium frame alloy 6061 aluminium frame characteristics internal cable routing 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 deore xt derailleur model shimano m781 front derailleurs shimano deore