Bontrager's 29-1 Expert tire is specifically designed and engineered for 29ers with a tread design that is ideally suited for dry and dust conditions. Tightly spaced center knobs provide fast-rolling traction, and the open outer tread provides excellent grip on dusty surfaces.
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Great on dry hardpack, however, when the trails (palos triangle) gets a bit moist, I seemed to slip around quite a bit, especially on the tree roots. Haven't tested them out on frozen trails yet.