Panaracer Removable Core Bicycle Tubes, 33 mm Presta Valve, Single or Two Pack Review Posted on February 6, 2019 By DuskunkTagged Cycling, Outdoor Recreation, panaracer, Sports & Outdoors, Tubes Removable valve core Variety of sizes available 33 mm Presta (French) Valve Made from .9 mm Buytl Rubber Sold in boxes with hangtags