pinion vs spur teeth

[lincpimp]

Originally Posted by azjc

I have heard a ballpark figure is 3 spur teeth is equal to 1 pinion tooth, so if you have data/proof I am wrong please don't slam it in my face.....LOL..I am only being the messenger and dont know for sure

If your pinion is 1/3 of the size of the spur then your ballpark figure is correct. Gear ratios are simple once you understand the overall need for gear reduction. Just divide the spurn tooth count by the pinion tooth cound to get the ratio. The larger the number the greater reduction you have.

49/20=2.45
52/20=2.6

It does not seem like alot, but will make a difference whe coupled with the tranny ratio and the diff ratio.

I run my savage with 14/47 gearing, which has a ratio of 3.35:1. That gives me 40+mph top speeds with the stock 2 speed tranny and 5.75 inch tall tires.

Originally Posted by dpb318

ok guys, thanks, ive been having heat issues with my 9xl on 4s on a savage and am using 20/49...the only other choice i have right now is going to a 52t spur which prob wont do too much lol...would you recommend 16 or 18 for my next pinion

Try the 52t spur, it will lower the ratio a bit and will help with temps. Plus you can do it right now!!!