Guy's just a random question, got a 13 6.2 ecsb with cai,american racing headers, and tune, just wondering how much et difference ya'll have seen with 17 or 18 inch wheels vs 20's or 22's. THANKS!

 

General idea is 100 lbs. on the truck is .1 in the quarter mile.
Rotational weight is considered about 4:1 vs. static weight.

So if you drop 20 lbs a tire you are effectively dropping 320 from the whole truck. On paper that gets you about .3-.4 in the quarter mile.

This is all general info and has proven overall to be fairly accurate, but there are millions of factors and the D/A can effect your time by .3-.5 easily.