Challenge Tires Grifo XS Open Tubular (Clincher)

Challenge Tires Grifo XS Open Tubular (Clincher)
  • Color: Black/Tan
  • Color: Black/White
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Start with a file-tread center section and add the side knobs of the Grifo and you have one fast tire. Despite its minimalist tread, Challenge's Grifo XS Open Tubular (Clincher) tire grips great on grass, pavement, and tacky dirt while rolling extremely fast everywhere. The XS is built upon the same supple 260tpi handmade casing as their renown tubulars, and there's an anti-puncture strip under the tread and reinforced polyester in the sidewalls for extra durability. The white-tread version is a softer rubber for better grip in cold temperatures.