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H&R Racing Products Adjustable Wheelbase 1/24 RTR assembled Rolling Chassis - Wheelbase adjustable from 3 5/8" to 4 7/8" (92mm to 123mm) - Includes new 40,000 RPM Motor with larger cooling holes, Soft SILICONE rear tires (Shore A 25 Hardness) on setscrew aluminum hubs, Oilite bushings, body mounting kit - Comes with inline motor mount & Parma axle gearing - recommended for plastic track application or commercial routed track racing where no glue is used