Shimano XTR has long been the pinnacle of the Shimano line of mountain bike componentry. When you are looking for top notch, fast shifting, hard braking parts for your rig, XTR is certainly a great set of parts to start with. With XTR, you get weight savings with the finely sculpted parts, smooth shifting and great reaction with braking, and Shimano's top-of-the-line set of bike parts. You won't find XTR on common bike store mountain bikes – they will be found on the best framesets in the shop. When you are talking go big or go home, Shimano XTR is totally go big!