Details: Maxxis' tomahawk double down is designed for all-mountain and enduro riding just like its sibling, the tomahawk ExO. The key difference between the two is in the Casing and overall weight: maxxis' double down Casing compound provides slightly heavier, downhill-inspired protection for the tomahawk double down than ExO. This new compound has a TPI of 120 compared to the expo's 60, and because of that, the tires' claimed weight tips the scales at just over 1, 000g. Besides the Casing, the overall features of the two tomahawk models are the same. The double down adeptly navigates muddy trails and pounds rocks using consistent, widely spaced knobs throughout, while the square profile makes the tires quick and reliable while cornering. Maxxis ensures that the tires' centers are fast-rolling for dry conditions as well -- with the added assurance of the double down Casing, you can add these to your already versatile 27. 5 and know they'll be ready for anything.