Hardtail mountain bike 29er mountain bike type ladies model 2017 series specialized jett frame material aluminium suspension system coil suspension fork feature preload adjust gear system with derailleur number of gears 24 rear derailleur shimano alivio front derailleur shimano altus front chain wheel teeth 443222 rear chain wheel teeth 11 34 chain kmc x8 brake type hydraulic disc brake brakes shimano m315 rims shimano tyres specialized mtb