"The Vittoria Terreno Dry G2. 0 TLR is built for the fast end of dry gravel and cyclocross, where low rolling resistance matters on the straights and the tread still needs to bite when the course kicks sideways. The low-profile center knobs keep momentum on hardpack and packed dirt. The mid-height transition knobs and aggressive outer lugs give the tire something to dig into when leaning through a loose corner or scrubbing speed before a barrier. Graphene 2. 0 compound improves traction and extends wear life over a standard rubber compound. What Our Gearhead® Experts Are Saying:""Worth knowing before you mount these: the 38-40 size measures closer to 38 on a narrower rim and closer to 40 on a wider one, so check your clearance against the wider figure to avoid surprises."""