These wheels will only fit Traxxas TRX-4M

RPM eliminated the slop in the suspension system

You may find the need to change your set up and electronics to maximize steering due to the high traction nature of the rear tires

It used a 37mm main gun

and shield

Power Hobby - 100mm Promatics Two Stage Internal Spring Shocks, Red, 2 Shocks RGR6051 These wheels will only fitFeatures: Bleeder hole Machined aluminum shock bodies Scale internal spring design Triple O ring cartridge Includes additional option springs to tune the spring rate ( soft Medium ) Allows you to set up the shocks with a sprung or droop configuration Fits 1 10 Crawler