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Challenge's Grifo 33 Open Tubular (Clincher) tire excels in snow, mud, grass, and firm dirt. It features a center section that offers excellent pedaling and braking traction, and its short knobs roll quickly. The Grifo is built on the same supple 300tpi hand-made casing as their renown tubulars, and there's an anti-puncture strip under the tread and polyester in the sidewalls for extra durability. The white-tread version is a softer rubber for better grip in cold temperatures.
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