Hardtail mountain bike 29er mountain bike 29 type mens model 2017 series cube attention frame material aluminium frame characteristics post mount brake adaptor internal cable routing bike frame sizes inch 23 21 17 19 18 inch bike frame sizes cm 58 43 53 48 46 cm suspension fork feature rebound suspension fork technology rock shox poploc gear system with derailleur number of gears 30 rear derailleur shimano deore xt derailleur model shimano m