Does anyone have any idea how much 20" rims effect the ET for the 1/4 mile? I plan on putting on some **** rims with drag radails so I can hook and there's less rotating mass. I guess I just want to know that it would be worth it.

 

how do you figure there less rotating mass? the steel wheels/aluminum is much heavier than air and the larger wheel (diam) is directly related to the rotating mass equation... 20" are too big, 18's are the biggest for a mustang. and they will add weight which may slow you down a few tenths, it depends if you go for bling or sport wheels too.... just put drag radials on your regular wheels.

 

I meant that the stang came with 20s and that I was wondering if it would be worth it to put some drag radials on some smaller rims, say 16s or something and try it like that.

 

don't bother keeping 20's on your stang if you want to put it on the strip. the largest reccommended is 18's with a great grippy tire. but 20's just add excess weight on launch. especially if it's 20's all the way around. 20's already mess up your speedometer calibration because of the larger diameter rim.

putting drag radials on a smaller tire but still having the 20's on the front will have you sitting kinda awkward on the line with a different height.

I have 17x9 (front) and 17x10.5 (rear) with grippy tires and I can make this pony fly.