Micro file pattern combines a smooth tread surface with micro ridges for high grip performance Designed specifically for compact folding bikes and touring recumbents Belted with puncture resistant ProTite belting PTB - ProTite Belting By using a special combination of high modulus yarn with proprietary epoxies that greatly improved puncture resistance at the tread Standard 20x1-1/8 451 Wire Belted Bk/Blk 90 260 PTB NoUPC/EAN/GTIN: 4931253013386