![Amazon.com : Challenge Grifo Cross Open Tubular Tire (Clincher) (Black/Brown, 33-mm) : Bike Tires : Sports & Outdoors Amazon.com : Challenge Grifo Cross Open Tubular Tire (Clincher) (Black/Brown, 33-mm) : Bike Tires : Sports & Outdoors](https://m.media-amazon.com/images/I/71ZMB3c-GIL._AC_UF1000,1000_QL80_.jpg)
Amazon.com : Challenge Grifo Cross Open Tubular Tire (Clincher) (Black/Brown, 33-mm) : Bike Tires : Sports & Outdoors
![New Product Spotlight: Challenge Fango Cyclocross Tubular Tire - Cyclocross Magazine - Cyclocross and Gravel News, Races, Bikes, Media New Product Spotlight: Challenge Fango Cyclocross Tubular Tire - Cyclocross Magazine - Cyclocross and Gravel News, Races, Bikes, Media](https://cxmagazine.com/wp-content/uploads/2008/09/challenge_fango_tubular_side3.jpg)
New Product Spotlight: Challenge Fango Cyclocross Tubular Tire - Cyclocross Magazine - Cyclocross and Gravel News, Races, Bikes, Media
![Challenge Grifo Cross Tubular Tire (Black/Brown, 33-mm) : Bike Tires : Sports & Outdoors - Amazon.com Challenge Grifo Cross Tubular Tire (Black/Brown, 33-mm) : Bike Tires : Sports & Outdoors - Amazon.com](https://m.media-amazon.com/images/I/61g3MABFctL._AC_UF350,350_QL50_.jpg)