Originally Posted by
wildman9907
Hey Chrisg23, I'm guessing your running the 21.5 at trains and lanes. If you look at something like 104t spur and 47 pinion puts you much closer to that 4.20 ratio
After getting out my pocket protecter and doing some math, your advice is dead on. 104s/47p x 1.9 = a 4.204 FDR. Thanks for the info.