![Challenge Shows New Grifo Clincher and Gravel Grinder Tire at NAHBS 2014 - Cyclocross Magazine - Cyclocross and Gravel News, Races, Bikes, Media Challenge Shows New Grifo Clincher and Gravel Grinder Tire at NAHBS 2014 - Cyclocross Magazine - Cyclocross and Gravel News, Races, Bikes, Media](https://www.cxmagazine.com/wp-content/uploads/2014/03/challenge0.jpg)
Challenge Shows New Grifo Clincher and Gravel Grinder Tire at NAHBS 2014 - Cyclocross Magazine - Cyclocross and Gravel News, Races, Bikes, Media
![Challenge Grifo Cross Open Tubular Tire (Clincher) (Black/Brown, 33-mm) : Buy Online at Best Price in KSA - Souq is now Amazon.sa: Sporting Goods Challenge Grifo Cross Open Tubular Tire (Clincher) (Black/Brown, 33-mm) : Buy Online at Best Price in KSA - Souq is now Amazon.sa: Sporting Goods](https://m.media-amazon.com/images/I/61NumkjNbTL.jpg)
Challenge Grifo Cross Open Tubular Tire (Clincher) (Black/Brown, 33-mm) : Buy Online at Best Price in KSA - Souq is now Amazon.sa: Sporting Goods
![Challenge Unveils Grifo Race Clincher, Hints at New Gravel and Fat Bike Tires, Colors - Cyclocross Magazine - Cyclocross and Gravel News, Races, Bikes, Media Challenge Unveils Grifo Race Clincher, Hints at New Gravel and Fat Bike Tires, Colors - Cyclocross Magazine - Cyclocross and Gravel News, Races, Bikes, Media](https://www.cxmagazine.com/wp-content/uploads/2014/03/challenge-cyclocross-gravel-tires-cxmagazine-img_9882-e_1.jpg)