We take the pro label seriously so we started with a very light but stiff carbon frame and added some of the best components we could find including a 2x11 shimano xt drive group the reaction gtc pro is the weapon of choice for everything from fast trail blasts to flat out racing in both 275 and 29 inch versions you can expect a peerless carbon frame from the reaction gtc it was created with the innovative twin mould technique fastidious design details like the large tube profiles tap