Originally Posted by Rysuleod
Pick your car and spur here. You can print out a gear ratio chart, then compare the ratio number to what the manual uses.
www.gearchart.com
Like the 2nd post said, gearchart.com will do the trick for ya. But, on a side note. The reedy 19 turn should be geared around 5.6 to 5.9 Not sure on the 10 turn. You may also have a hard time fitting the correct size pinion with the 128 spur gear. PRS use to make an adaptor to fit on the xxxs so you can run regular spur gears. If not, you should be OK with the losi green colored spur gear for the proper gear ratio's.