tips

To determine overal gear ratio look up your internal gear box ratio from the manufacturer and add that to your spur to pinion ratio.

To determine distance traveled per tire revolution put mark on your tire.then line that up on 0 on a ruler. Then rotate the tire till it comes back to the mark.the number it lands on will be the distance traveled.

Now if you know the rpm of your motor you can determine the mathematical top speed of your vehicle. Depending on the power of your motor and the capability of your batteries to power your motor to ita fullest the actual speed can vary as much as 15% to 20% percent from the math. resistance both aero and mechanical will also affect final track speed.

Just throw a 20 tooth pinion on her and see how hot she is after 3 minutes. If your motor is less than 150 degrees youre good to go. LOL

For those of you who may not know or want a better understanding of what the diffs do in your car her is a link that helps explain it pretty well.there is also a video that shows the principles in action.the beginning is a bit boring but its worth a watch. forums.thetoyz.com/index.php?showtopic=51953&view=&hl=&fromsearch=1

I've found that with our track you need to gear a shade lower than the recommended gearing for a said vehicle to compensate for heat build up. This is especially true in the 4wd class. I went from a 14 to a 13 tooth pinion and might go to a 12 just to get a little more punch on the straight. I'm far from winding out my 4600kv as is so ill take all the bottom end I can get