For instance, the FSRxc utilizes an M4 (rather than M5) blend alloy frame. Regardless, the Pro still stands tall as a champion due to its impressive RockShox Reba SL 120mm fork that is ultra-lightweight, yet provides enough tracking to be pushed hard and with plenty of control. Note also the Avid Juicy 4 brakes, which are extra powerful for awesome stopping power even when riding on wet/muddy surfaces. Signature to the Pro is its fully adjustable air spring suspension, which allows users to easily adjust the air pressure to fit their body weight — the result being greatly enhanced performance.