Keep your Rock-N-Roller R2 Micro Truck rolling smoothly with the Rock-N-Roller 6-inch Rear Wheel. Designed specifically for the R2 by Rock-N-Roller, this modlon rubber rear wheel caster is best suited for use on smooth, hard surfaces. * Replacement rear wheel for Rock-N-Roller R2 Micro Truck * 6-inch hard moldon rubber * Ideal for use on smooth surfaces * 1.5-inch tread width, 5/8-inch (16mm) axle bore * Manufactured by Rock-N-Roller