Disc brakes are arguably the most important and significant development in bike technology in the last few years. They are the key specification feature on this bike. Modulation of the braking improves confidence in all conditions. The wet weather performance is a boon to safety and the stopping distance in the dry is superior due to increased ultimate stopping power. The Sport Disc has a light alloy frame and Shimano 21 speed gearing with STI shifters, these are quality features that make this a great all-round mountain bike.