Gravdal Studded Tubeless TireDescription High traction studded winter commuter tire. Versatile and confidence inspiring, the Gravdal securely navigates through harsh winter conditions with steel carbide studs for added traction in icy conditions. Siping creates a more conforming lug for added traction 252 concave carbide studs tear into slick surfaces Fast rolling ramped center lugs provide decreased rolling resistance Aggressive rear faces of center lugs provide excellent