S&M's street tire 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, and multi-edged S/M shoulder tread design that looks cool and holds the ground. The 2.1 is light and fast and works well in the front or rear. It’s big enough for today’s street riding but small enough to stay out of the way on grinds, spines, or frames and forks with minimal clearance. The 2.4 works equally well on the front and rear for riders that prefer big tires.