The whyte t 129 rs 29er mountain bike 2017 returns with an improved spec to create the ultimate trail bike ride delivering the ultimate speed and flow to tackle tricky singletrack short chainstays give the whyte t 129 the agility of a 275 bike but with the inertia and terrain flattening advantages of a larger 29er wheel the scr frame design comes with a new rear chainstay providing enough mud clearance for 235 tyres shimano39s all new xt m8000 cassette with its 11 46t range this