Originally Posted by
xevias
Follow Dan's advice. I'm at 2.75 on a huge carpet track with a Motiv 21.5. Blinky. No fan.
Had it full throttle for about 20% of the lap aside from the straight.
At ETS with hobbywing 21,5 motor and blinky, the winner run as high as 39 pinion which is 2.46 with the new Ride XR tires. Last year the max was 2.55 with the R1 tire which are larger a bit.