26" Aspens are only available in the high quality eXCeption casing. The 29er versions are available either as standard kevlar or the lighter 120 TPI eXCeption casing. Tyre weights: 2.1 eXCeption: Average 478g 2.25 eXCeption: Average 591g 29er 2.1 eXCeption: Average 544g (6 weighed) 29er 2.1 kevlar: Average 650g (4 weighed) We're not too sure on what rubber compounds come on these tyres but this is what we have.... All 2.1 versions (both 26" and 29er) are listed by Maxxis as dual compound 62a/70a. The 26" 2.25 are listed as 70a. We don't know which bit of the dual compound tyres are the softer rubber and which bits are harder.
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