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There is no denying that these tires are great, i had no problem sealing them to my Easton EA90 rims and they are very light, handle incredibly and have low rolling resistance..... having said that they are not that strong. the first race i rode with this tire, the sidewall got slashed and the hole was too big for Stans to seal it. Now this could just be bad luck but I've been riding mountain bikes since the mid 90's and have never experienced this with any other tire and although the trail i was on was fairly rocky, I've ridden it probably 100 times on a Specialized fast track (a heavier tire i know) and never had a problem.