Sorry I did not see your message from months ago. I did not realize I had messenging on. Hopefully you found your answer. We do like to see a Rspro with 7.5 and faster in 4wd offroad. RS is rated to a 5.5 in light duty like 2wd buggy.
I'm trying to find out if I can run a 7.5 sensored motor with the RS speedy (non-Pro version) in my B44. We have a fairly low traction track that is for 1/8, so lots of wide open spaces.
I don't want to get a 7.5 and find I have thermalling issues. The doco's say it is good to 5.5, but I can't afford to go and buy another motor if it gets too hot (wifey is catching on).
Please help!