These Challenge Grifo tubulars are the tires that use the original Clement molds. Challenge tubulars are handmade tires with super supple sidewalls (similar to Dugast tires). Need tubulars? The Challenge Grifo are the ones you'll want to have. Now available in three sizes 30mm (395 grams), 32mm (410 grams), and 34mm (420 grams). A perfect match with our Mastik Tubular Glue and and Sidewall Sealant Absolutely no tubular may be returned that has been glued. $79.99 Size: 30mm (Out of Stock)32mm(Out of Stock)34mm (Out of Stock) Quantity: