Originally Posted by
BrandonBreh
Good info! Thanks! Now what's the difference between running a 69/31 vs 81/27. I guess this goes back to gear ratios and everything, but is there an actual difference? Just some extra info, the class is on a small high traction track. Rules are 17.5 motor but you are allowed to run esc timing.
Those are two totally different gear ratios. It's like asking "When I drive my full sized car, what is the difference between being in 1st gear, and being in 4th gear"? Totally different gear ratios. Your power band will be at a lower speed with one, and a higher speed with the other. You need to gear your car for it's weight, and track size/lap times.
The question USUALLY asked, is "whats the difference between 69/31 and 73/32?". Same basic gear ratio, so no real difference. The biggest difference, is where it positions your motor in the car. In a MM car, larger gear sets, while keeping the same ratio, will move the motor forward creating more steering.