Gram for gram, mountain wheels take more punishment than any other component on the bike. That’s why Reynolds - for 2011 - has completely re-thought and re-engineered our mountain wheelsets from the ground, up. The Reynolds AM is a tubeless mountain wheel designed for maximum performance under the harshest treatment. However the AM is a little stouter, and slightly heavier. But fear not: the AM loves to climb, and manages to go uphill with nearly as much airy grace as it descends