Light skinwall casing and 294 sharp steel studs with carbide pins Nokians final stage in production shrinks the rubber around the studs Nontoxic 58a winter rubber tread compound provides excellent grip on snow and ice Tire Use WinterStudded Number of Studs 294 Color TreadSide BlackBlack Tire Type Clincher Tire Diameter 29 ISO Width 53 mm ISO Diameter 622 Tire Bead Steel PSI 50 65 PSI Weight 1,100 grams It is not uncommon