The long distance runnera durable carbon black mixture a well regarded puncture protection system and the duraskin anti cut fabric turn the gatorskin formerly known as ultra gatorskin into a real long distance runner in varying widths from 23mm to 32mm it can be used on the way to work as well as training for road races or for sportives and audax the gatorskin is a highly popular tyre at a nice priceclick size guide to enlarge