Extra thick slick tread that resists punctures and gets great wear life, a favorite of fixie riders now available in a multitude of sizes FG - Flat Guard, features an Urban Armor Casing, which provides additional rubber throughout the entire casing and sidewall to deliver additional puncture protection and durability Standard 29x2.1 622 Wire Belted Bk/Blk 65 535 27 FG NoUPC/EAN/GTIN: 714401106239