I had a TC4 with a Mamba Max 7700kv kit in it running a 2s lipo. I loved it, but had to sell it to finish another project It had good run time and was stupid fast. Foam tires are needed on loose surfaces though. I can remember my gearing, but i know it would do close to 70mph. I used it for burnouts, donuts, drifting, flying, shear terror, speed runs, and running on the practice track. It held up well though, i lost a lugnut and slung a tire.