Say hello to the Billy Bonkers tyres. Schwalbe's new purpose built tyre for pumptrack, dirt jump and slopestyle. This lightweight not only rolls incredibly easily, but it also ensures fun, loving and agile riding. If tricks and jumps don't quite go according to plan, then rest assured that the Billy Bonkers tyres will remain stable, good natured and forgiving even for the worst mistakes.* Maximal micro teeth for grip on dusty and sandy ground. * Closely positioned blocks multiply the grippy edges.* Small ramps insrease the speed of the tyre. The result means more airtime**ETRTO:*** SCM030A: 54-559* SCM030B: 57-559* SCM030F: 54-559* SCM035: 50-406* SCM037: 54-559* SCM037A: 57-559