Originally Posted by
turtlebmx
hey yeti what size track are you on? i run on a small carpet track and the gearing chart isnt even close. I'm right around 2.5. i think i'm at a 118/47.
I personally have never run a 17.5 but it is the recommended starting point for FDR for that motor at 3.5. I would have to guess if you need to change gearing you will have to purchase a PRS adapter and get smaller spur gears. I am not saying it is the perfect gearing, just the starting point.