The ENVE's M60 Forty 27. 5in Wheelset is an ideal match for the latest generation of lightweight, shockingly capable trail bikes. This rim was designed to sit between the previous XC and AM rim, making it perfect for the way that most of us actually ride our mountain bikes. And with its completely redesigned profile that's six years in the making, you're looking at a wheelset that's stable and tough. Oh, and don't forget, it's XC race light. Welcome to the future.When ENVE set about designing the M60 Forty, the goal was to build a rim that occupied the space between the previous XC and AM rims, with the understanding that the aforementioned midpoint represented the ultimate rim for the way that most people ride off road. Unsurprisingly, the team in Ogden delivered in spades. The 27. 5in M60 Forty rim now weighs 374g, making it 40g lighter than the previous AM rim, and nearly the same weight as the XC. Part of this weight savings has been accomplished by trading in traditional bead hooks for a redesigned beadless hook bead, which is both lighter and more impact resistant. The width is a generous 23mm internally, which provides a round tire profile, for greater cornering stability, and more rubber on the ground at any given time. By relieving material from the rim, ENVE has taken the M60 Forty's tuned ride feel to previously unseen levels. Anyone who's familiar with ENVE knows the fanatical lengths that its engineers go to in order to achieve a perfect ride feel. Accordingly, the M60 Forty has been tuned to provide a degree of vertical compliance, thereby reducing rider fatigue, without sacrificing the fantastic lateral rigidity that endows ENVE with the on rails feeling for which they're prized.The rim tells most of the story, but these wheels are hand built in Utah, to exacting standards, which provides the longevity you'd expect out of a class leading wheel system. They're laced to DT Swiss 240 hubs, with your choice of either a Centerlock or standard 6 bolt...