Hot laps on wet grass put every corner exit to the test, and the Challenge Chicane Pro Tubular Tire keeps hold of the ground there while it rolls fast on firmer sections. This handmade tubular cyclocross tire pairs a supple Super Polyester casing with Challenge's Smart compound, a tread rubber that never sees vulcanization heat. The fast-rolling center suits dry hardpack, and the added bite handles slick, icy conditions. What Our Gearhead(R) Experts Are Saying:"Deep-profile rims can leave a tubular's valve stem short of the pump head, so I keep a valve extender on hand when I mount this one. Having the latex tube already inside the tire saves a step before the first ride."