Im new to this site, but not new to the topic. I just got a 06 cts with the 18" wheel group and was trying to find out the weight of each rim.....checking on ebay one seler listed the shipping weight as 150lbs....thats 37.5lbs per rim......if thats true i would get my ass kicked by the same cts with lighter wheels. Can anyone confirm that the 18" w/o appearance package weight 37.5lbs!!!

If I even got new 18" rims weighting 23lbs thats about 30lbs out of the drivetrain.....!

This question has come up before but went unanswered. You are correct about heavy wheels robbing horsepower. When you up yhr size to 19" and 20" you usually inrease the weight too. IF HP and gas mileage is a goal, weight is important. Sorry I can't give you the weight.:)

I'll trade you my lighter 16's for your 18's :alchi:

As I recall, my Mille Miglia Evo 5's (18x8) are 27 lbs bare. I weighed one on a digital bathroom scale with 245/45R18's and 32 lbs of air. It was 43 lbs total.

Man, all chrome 20" or 22" must weigh a TON then huh....

Man, all chrome 20" or 22" must weight a TON then huh....

DON'T FORGET THE WEIGHT OF ALL THAT RUBBER.:eek:

If you're very concerned about unsprung weight, they do make lightweight rims. Though they may be a tad expensive, and may not have the style you're looking for, but who cares, people will only see the rear end of your car when you blow by then ;)

I recall seeing figures like 17lbs for 17" rims.

Odysseus, I think dida a calculation for us on the amout of horsepower lost on various wheel sizes. Maybe I can coax Ody over here to share it again. Why yes, he is a rocket scientest.:bouncy:

On back to back dyno runs, it lost 5 RWHP from the stock 17x7.5s with 225\50R17s to the lightweight 18x8 Mille Miglias with 245\45R18 rubber. I recall there being something like a 8 or 9 lb diffence between them, but I will have them off tomorrow for my sway install. Ill stick them on the digital scale again, along with the stockers, which I still have.

The deal with bigger wheels is that youre replacing what was air inside the tire, with aluminum (at a 10 inch radius, vs 8 inches of the stock 16 inch wheel). While aluminum is relatively light weight, next time you see a billet block of it, pick it up. Its lighter than steel, but still heavy. Heavier weight further out increases the moment of inertia by the square of the distance. (I=mr^2). So not just increasing the mass, but putting it further out, changes the dynamics. This is what the engine must counter when accelerating, and the brakes must stop. The term Lightweight is totally relative.

My stock 16's with tires are ~42 lbs and my new 18's with tires are ~47 lbs.

On back to back dyno runs, it lost 5 RWHP from the stock 17x7.5s with 225\50R17s to the lightweight 18x8 Mille Miglias with 245\45R18 rubber. I recall there being something like a 8 or 9 lb diffence between them, but I will have them off tomorrow for my sway install. Ill stick them on the digital scale again, along with the stockers, which I still have.

The deal with bigger wheels is that youre replacing what was air inside the tire, with aluminum (at a 10 inch radius, vs 8 inches of the stock 16 inch wheel). While aluminum is relatively light weight, next time you see a billet block of it, pick it up. Its lighter than steel, but still heavy. Heavier weight further out increases the moment of inertia by the square of the distance. (I=mr^2). So not just increasing the mass, but putting it further out, changes the dynamics. This is what the engine must counter when accelerating, and the brakes must stop. The term Lightweight is totally relative.

I saved it this time Ody. Thanks :thumbsup: