If you're starting out with radio control

Measure the outside diameter of the motor can before selecting a mount

Electronic Speed Controller (sold separately)

It has standard 36 inch wheels and a longer wheel base than the 50 or 70 ton roller bearing trucks

Thread-lock

Traxxas 7841 Medium GTX Springs 2.59-Rate Vorteks Parts If you're starting out withOne pair per package. Traxxas offers the medium GTX spring in ten rates so you can tune XRT suspension performance or compensate for a lighter or heavier vehicle setup. The higher the rate number, the firmer the spring. At 2. 59 this is the second softest spring in the XRT range, one step up from the 2. 355. A softer spring increases chassis roll and mechanical traction, works better over bumps and rough surfaces, and is more likely to bottom out