Rise to speed on any course. The XC-27 wheelset was engineered to conquer singletrack as quickly as possible, able to make easy work of steep climbs and rough descents.
A great wheelset is the biggest upgrade you can make to a bike, and the XC-25s were engineered to improve almost everything about it. Sharper handling, faster acceleration, and a smoother ride all add up to more control on the trail.
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