A top performer in dry conditions exo protection offered in select models fast rolling centre ridge front or rear raised side knobs for better cornering the crossmark is the dramatic evolution of the cross country racing tyre the nearly continuous centre ridge flies on hardpack yet has enough spacing to grab wet roots and rocks the slightly raised ridge of side knobs offers cornering precision never before seen on a tyre this fast tyre size etrto tpi bead weight lbs compound max psi tech