Quarq

Power meters give you crucial insight into yourself and the demands of your target event.
XC riders can dial in their training, objectively assess race results and fine-tune their diet. Marathon racers can pace their efforts and monitor energy loss. Road cyclists and triathletes can continue to track form and fitness off road.
Quarq power meters are lightweight, accurate and durable, feature a replaceable battery, and are compatible with SRAM’s 2X10 MTB groupsets.
Like cross-country and downhill world champions, and marathon racing rockstars, you can take your cycling to the next level with Quarq.

S2275 Quarq™ MTB Power Meter