Schwalbe Billy Bonkers 26 x 2.10" Folding Dirt/BMX Bike Tyre - PerformanceSchwalbe Billy Bonkers 26 x 2. 10" Folding Dirt BMX Bike Tyre Performance The Schwalbe Billy Bonkers HS600 tyre is specially designed for Pumptracks, Dirtjump and Slopestyle. This light weight provides incredible performance with fun and agility. Even if tricks and jumps are missed, the Billy Bonkers remains in good spirits, forgiving even the most glaring mistakes. The sharp micro tines guarantee grip on dusty and sandy ground. Tightly positioned