Originally Posted by liv2mx
my 42's are 95 pounds a 17" 43 weighs 121. almost 30 pounds difference in a steel 17 versus a aluminum 20" rim. so 55 pounds or more difference in a steel 17 on a 43 versus the 42 on a 20.
Did you weigh the wheels?
I don't doubt the difference, 55lbs of rotating mass * 4 wheels * gear reduction equals a lot of horsepower. I know I could feel the difference in throttle response when I put the 9lb flywheel weight on my 2.5L YJ...it was awesome for crawling but trying to tackle a long hill with an SM420 (think bread truck) was an exersize in futility.
Seems the game you're looking to play would be best played with the lightest possible wheel/tire combo (within durability reason), otherwise you'd have to jump tax brackets in the motor department.