Rock Crusher Monster 40 Series ; Tires RC4WD Store. Rock Crusher is designed to run truck such as Traxxas Revo, T Maxx, HPI Savage, Tamiya Clod Buster, TXT 1, Juggernaut. (You will need 40 series wheels in order to run these Tires) For complete truck, you will need 2 set of this product.