I was running a Speed Passion 7.5 in my Durango indoor it got warm but nothing to worry about gearing 24/std spur gear
Outdoors been running a Speed Passsion 6.5 with a 23 or 24 pinion and LRP SXX with no fans been fine
Also i have a Speed Passion 5.5 used it for one race then went back to the 6.5 witch is plenty fast enough in my opinion
Paul
