The Zaffiro is designed with deeper cuts in the middle tread and shallower cuts on the shoulder tread, giving a faster and safer tire when cornering.Aramid Endura 3-D compound treadPRB (Puncture Resistant Belting)26 tpi nylon casingItem SpecificationsWeight390gPSI85-100PSITire BeadSteelISO Diameter630 / 27"ISO Width28mmLabeled Size1-1/8Color Tread/SideBlack/BlackTire TypeClincherTire Diameter27"Tire UseRoadDefined ColorBlack