Schwalbe rock razor addix mtb tyre snakeskinthe schwalbe rock razor addix mtb tyre was designed primarily for use as a rear tyre aimed at riders who need a lightning fast tyre for use on very fast and dry trails it has minimal rolling resistance and little weight fast rolling bites into the trailon the central column of the tyre it has fast rolling low profile flat studs to keep rolling speed consistent along the edges on the shoulders of the tread profile it has sturdy sharp angled lugs