If youre after an ultra lightweight xc race mountainbike tyre with a low rolling resistance the new xr0 team issue 29 tlr mountain bike tyre from bontrager could be just what you have been waiting for with its dual directional tread design 6260a durometer and aramid bead this clincher tyre excels in hardpack conditions and weighs in at only 435g making this an ideal ultra light superfast rolling race tyre