The "Open" tubular is what most folks know as a clincher tire. Challenge believes the Open tubular is very similar in ride quality, durability and performance to the corresponding tubular tire except it is designed to fit a clincher rim. It is like an un-sewn sew-up.

Challenge handmade tires offer greater control and riding comfort. The control and comfort benefits are achieved by Challenge gluing the tread onto the casing by hand during the manufacturing process. Most other tubular tires bond the tread to the casing with a high-heat, automated process. The high heat vulcanization process produces a tire where the tread is under tension. This creates a stiffer casing, harder ride, and tread cuts that tend to rapidly expand. Challenge's method of hand gluing the tread to the casing allows the tread to conform to the road surface and offers the best performance with the supple, high tpi casing of a premium tire. Challenge may be a new name, but Challenge is a rebirth of the well-known Clement brand.

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