This going to sound strange,but gear it what ever you want.That motor will pull whatever gearing you put on it with a Rustler,and shouldn't get hot.My Hv4.5 in my Pede(roughly same kv) I could gear anything I wanted and it would not go above 125* So how fast do you want to go?I would go with the 1/8 shaft and around 23/83 for bashing.