![]() Given the large selection of tires on the market that deliver excellent performance with reliability, it is our recommendation that ENVE customers should not pair these tires with their ENVE wheelsets. The tires most susceptible to this failure are those with a “handmade open tubular” type construction. The Strada Pro is a handmade open tubular (clincher) road bike tire from the small Italian manufacturer Challenge. Challenge Criterium Open Tubular 700c Clincher Road Bicycle Tire (Black/Black - 74.99: 10:24:39. ![]() ![]() This is can be caused by a variety of factors, among them, low bead stiffness, varying tire diameters, over inflation, or some combo of the three. Challenge 700x25 Criterium Open Tubular TIRE700 x 25 CHALLENGE CRITERIUM SC More Info. The second failure mode is that of the tire itself stretching off the rim. The cutting of the sidewall is the result of soft fibers (the cotton or similar textile) being abraded by the harder edge of the rim during the rotational compression cycles of wheel and tire. With the Open Criterium, Challenge builds the supple casing then adds a strong protection layer and a moderately firm, non-vulcanized rubber with an active tread pattern to better master the cornering stress and challenging road. Once cut through, the tube extrudes through the tear and bursts, often unseating the tire from the rim resulting in sudden loss of control and a crash. Open Tubular tires are more supple than standard clinchers, with a ride quality approaching classic tubular feel. ![]() The first failure is best defined as a cut or wearing through of the natural fibers on the sidewall of the tire at or near the rim’s hook bead. There are two specific failure modes that have been documented and are not limited to ENVE rims, rather these failures have been consistent in our test lab on a variety of other manufacture’s rims, both alloy and carbon. ![]()
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