Matt Murphy (Murfdogg) is my motor guy so I don't worry about that stuff. He builds it I run it no questions asked. Both my SC10 4w motors have 12.5 rotors in them but they are his mod rotor's which I think are long stack rotors. (if that makes sense)

I can tell you that "I wish I had more motor" or "I don't think I can last a 10 minute main" have not been heard from me at the track. I just tune the chassis and keep it on the wheels the rest is done.

Race one or Chase one