ensign_lee

So I got some GT500 takeoffs to go with my GT500 front conversion.

Thing is, I saw my car in the shop today, and she actually looks pretty damn good with the 17" machined aluminum rims on her. I'm wavering as to whether to switch to the GT500 rims or not.

For those of y'all that have made the switch to GT500 rims, are they any pros/cons that you'd like to share?

For instance, I think I read that combined, the GT500 rims are 8 lbs heavier, which would slow down my car. I'm not quite sure how much though - I mean 8 lbs out of the 3300 that our car weighs should be close to negligible, no? Or is it that the 8 lbs are part of the rotational mass and so therefore affect the ride MUCH more?

Also, I'd have Pirelli P-Zero Nero's on the 17" Machined Aluminum rims vs. the Goodyear Eagle F1 Supercars on the GT500 rims.

MELLOWYELLOW06

GT500 front is too aggressive looking for the rather tame (though very nice looking) rims. I would put them on. Or switch every once in a while

siberian.mist

gt500 rims weigh 28+lbs each, might as well get some 20s that way the same and look 100 times better.

trigger06

What 20" rim weighs less than 28lbs?

MELLOWYELLOW06

Both my MRR's were about 27lbs..

siberian.mist

mine are 28 lbs each. most forged 2-3 piece 20s are even lighter than that. some 20s are like 40 lbs each though.

Norm Peterson

Performance-wise, I'd estimate the acceleration penalty to be worth somewhere around a tenth or less in the quarter. The fact that it's rotating mass does matter, but not nearly as much as many "word of mouth" rules of thumb claim. I figure that 32 total additional wheel lbs is going to play more like 50 lbs of barbell weights in the car (and I think the GT's come in at 3500).

Ride-wise, you might want to run a little more rebound stiffness in the shocks/struts under some conditions, assuming adjustable shocks.


I think that there are two versions of the Eagle F1 Supercars, a 220 treadwear model and a newer one at 180. I'm not convinced that either of them is any better than the Eagle F1 Asymmetrics. I'd read the comparative tire tests at Tire Rack and do a little reading between the lines of the commentary and the summaries.


Norm

ensign_lee

I don't think that it's 32 additional wheel lbs. I think it's 8 lbs total for all four wheels. Isn't that right?

Norm Peterson

If that's the case, 2 lb/wheel is a meaningless difference in just about anything other than accurately timed competition. Or if you had to move and re-stack a thousand of them a day manually.


Norm

Archer1

I just put GT500 take offs on my 05 GT. It had the same wheels as you have now. During the change over I weighed each on a bathroom scale. Not the most accurate but good enough to confirm that I need to skip a few meals...
The GT500 wheel and tire together was 60lbs. and the machined "Premium" was 50lbs. I have uprated shocks and springs as well so control of the added mass should be taken care of. I think they look great and now I have room for Brembo brakes. The stock tires are just too narrow for a muscle car and the P Zero Nero would flat spot after a few days sitting, making for a rough few miles until warmed up. I have no regrets. It corners like it's on rails. And regarding 18" vs. 20". Carroll Shelby and company thought it was to much of a sacrifice to use 20" so that's good enough for me. They felt the additional rotating mass put to much stress on the brakes and took to much HP to get them moving quickly.