S&M's Speedball is their street designed tyre, coming in wire bead only in a high pressure casing. A smooth unbroken centre strip has low rolling resistance, with multi edged S/M shoulder tread design that looks cool and holds the ground. Available in two sizes, the 2.1" is light, fast and works well in either the front or the rear. It's big enough for todays street riding but small enough to stay out of the way of grinds, spines or frames. While the 2.4" version beefs the tyre up a bit for those that prefer a more substantial tyre. Max pressure rating: 110 psi ###section### Product Specs WHEEL SIZE: 20" MAX PRESSURE: 110 PSI WEIGHT: 737g (26oz) PACK SIZE: Single Colour: Black, Pink Wall, White Wall; Size: 2.1", 2.4", 2.25"