Originally Posted by mild seven
if you use a 21t pinion that would be about right. that gives u a ratio of 4.9.
i also noticed the tamiya gears are MUCH larger than the regular 48 or 64 pitch gears. however there is a gap between the outside of the driveshaft annd the inside of the gear. there is a shim that fits the 64 pitch, you know if there is one that will fit the 48p?
F103RM-11 64Pitch POM Gear Ring from 3 racing.