I wanted to know how much effect do 18 inch rims (~20 lbs) have on a 1/4 mile run...how many tenths of a second? Thanks!

 

if their lighter than the rims your currently running on, it wont make a huge difference, but an increase in the radius affects more than an increase in weight: moment of inertia = (Mass)*(Radius^2) so increasing the size affects acceleration more rapidly than an increase in mass. as far as times, might only turn out to be .1, .2 at the most

 

I just ran a 15.6 @ 85.6 mph out at the track on my 18's. I think they picked up better than my stocks did. That's all stock. With nothin' removed from the interior.

 

That's not bad at all...considering my friend with a 96 GLE and 18's ran a 16.7 lol

 

I pick up a .2 with 11.5lb 15's compared to 23lb 17's (just the fronts swaped out).

 

That's fairly significant. Do you see most of that early in the run?

 

yhea, mostly seems to help the 60' and to the 330 mark

 

Are those Mazda RX-7, or Millenia rims by any chance? Because those are light as ****

 

Millenia's

 

how much do they cost and where did you get them from?