The Speedball is S&M's new street tyre. Available in a wire bead only in a high pressure casing with extra pinch flat protection for street riders that run lower pressure. The Speedball features a smooth unbroken center strip for less rolling resistance, & multi edged S/M shoulder tread design that looks cool & holds the ground. The 2.1 is light & fast & works well in the front or rear. ItÕs big enough for todayÕs street riding but small enough to stay out of the way on grinds, spines, or frames & forks with minimal clearance. The 2.4 works equally well on the front & rear for riders that prefer big tyres.