H&R Racing 1/24 RTR Chassis - (26k RPM Motor) Nascar Wheels W/Silicone Tires: H&R Racing 1/24 RTR assembled Rolling Chassis - Wheelbase is adjustable from 3-5/8" to 4-7/8" (92mm to 123mm). Includes 26K RPM small can Cobra motor, WIDE 27x18mm rear SILICONE Rubber Tires with NASCAR Silver Wheels on set screw aluminum hubs and hard rubber NASCAR wheel fronts, Oilite bushings, body mounting kit - Comes with inline motor mount & Cobra axle gearing - recommended for plastic home track application or commercial routed track racing where no tire glue is used.