Schwalbe Billy Bonkers HS600 Tire; 26x2.10" 54-559 sw/brz-Skin KG Active SBC. Say hello to Billy Bonkers, the new Schwalbe tire for pump tracks, dirt jumps, and slopestyle. This lightweight tire not only rolls extremely easily but also rides in a very playful and agile manner. Even after botched tricks and jumps, Billy Bonkers remains incredibly forgiving and tolerates rougher mistakes. The maximum micro-tread provides grip on dusty surfaces, and finely tuned blocks multiply the grip edges. Additionally, small ramps aid in rolling, making the tire faster – resulting in more airtime.