So you got a rad bike, but want to replace those stock rims - or maybe you want a smoother, lighter ride. The ENVE M60 Forty HV Carbon Rim is hand made in the USA and of the highest quality using carbon fiber that transfers less vibrations for a smoother ride over aluminum rims. These rims are the High Volume version, with a shallower hook-less sidewall that accommodates newer HV tires. Why go HV? High Volume tires allow for greater surface area than your standard tire. ENVE has done extensive testing in order to find the ideal rim width to maximize the contact patch of the tire without sacrificing weight savings, strength or tire longevity. As far as MTB rims go, the ENVE M60 Forty HV Carbon Rim is the cream of the crop.