Here is the skinny on my stock wheels weight compared to aftermarket wheels.
Stock 18" g8 wheels and tires. 54 lbs tire 27 lbs and wheel 27 lbs.
Ruff Racing and Kuhmo 19x9.5. 64 lbs tire 30 lbs and wheel 34 lbs.
19x8.5 60 lbs tire 29 lbs and wheel 31 lbs.
This may help you find the correct wheels and it may not. So, lets compare if you were to do a 22" wheel. I'll take my old 300 as an example. I weighed my stock 18's that were on the 300, 56 lbs and with the 22"s American Racing rts and Hankook 265-35's, hold on, 85 lbs. If you want to add the much rotating mass, have at it. Thats why I wanted to stay with a lighter wheel and the 19's. It absolutely killed my 300's performance. We have 361 hp under our right foot and just take off a bunch with 22's. Granted the right 22 or even 20 will look great, but, it comes with all the problems associated with weight, braking and wot starts. I can tell just a slight difference with only 10 lbs on the rear and 6 on the front. I don't think my car runs as strong on the bottom end. Good luck, post if you got em.

Thanks, I fixed it. I got my numbers mixed up. Went back a verified tire and wheel weights. That should look better to you.

Yeah that is one disadvantage to going bigger. Happened with my GTP when I put GXP rims and brakes on it.

But truth be told, I never had the car to the track and I don't race it so it doesn't matter to me.

I know of numerous forged 20's that weigh less than 34 pounds... Going bigger isn't necessarily a problem if you're willing to fork out the money for lightweight forged wheels.

fyi many of the higher end forged 19" wheels I have used/seen weigh close to 20lbs

Here is the skinny on my stock wheels weight compared to aftermarket wheels.
Stock 18" g8 wheels and tires. 54 lbs tire 27 lbs and wheel 27 lbs.
Ruff Racing and Kuhmo 19x9.5. 64 lbs tire 30 lbs and wheel 34 lbs.
19x8.5 60 lbs tire 29 lbs and wheel 31 lbs.
This may help you find the correct wheels and it may not. So, lets compare if you were to do a 22" wheel. I'll take my old 300 as an example. I weighed my stock 18's that were on the 300, 56 lbs and with the 22"s American Racing rts and Hankook 265-35's, hold on, 85 lbs. If you want to add the much rotating mass, have at it. Thats why I wanted to stay with a lighter wheel and the 19's. It absolutely killed my 300's performance. We have 361 hp under our right foot and just take off a bunch with 22's. Granted the right 22 or even 20 will look great, but, it comes with all the problems associated with weight, braking and wot starts. I can tell just a slight difference with only 10 lbs on the rear and 6 on the front. I don't think my car runs as strong on the bottom end. Good luck, post if you got em.

take your back seat and carpet out and you will go even faster..dont forget to weigh your brake fluid .that would be worth a little more speed to..
quote::
I can tell just a slight difference with only 10 lbs on the rear and 6 on the front. I don't think my car runs as strong on the bottom end. Good luck, post if you got
that's bull ****....stop watching myth busters buddy

Its just amazing you idiots that come on these forums, you really don't know **** about cars and rotating mass. Your the ones that ruin these forums. Probably never been to the strip, never drag raced and have never purchased a set of wheels the cost $3000.00 Buy the 22's if thats what you want. I could care less, I'm just trying to provide information to the ones who do care. Ignition, you probably don't even have a g8. Your just on here raising **** level. I don't need some smart ass trashing me, I've never told anyone not to buy the big wheels, I'm just telling them I've been there. Get a grip, you might learn something on mythbusters.

Its just amazing you idiots that come on these forums, you really don't know **** about cars and rotating mass. Your the ones that ruin these forums. Probably never been to the strip, never drag raced and have never purchased a set of wheels the cost $3000.00 Buy the 22's if thats what you want. I could care less, I'm just trying to provide information to the ones who do care. Ignition, you probably don't even have a g8. Your just on here raising **** level. I don't need some smart ass trashing me, I've never told anyone not to buy the big wheels, I'm just telling them I've been there. Get a grip, you might learn something on mythbusters.

you must really be the guy in the white shirt ....but no i dont have a G8 & i have never taken my pinto to the track...but i would not pay $3000 after a year of me saving to buy those crappy chrome wheels you have...they would lower the performance of the pinto & make it look to pimped out...

You can get into this whole rotating inertia whatever talk, but in reality, that theory about less being better went out the window the second you started racing a 4 door sedan. If you were THAT concerned, you'd worry about other things.

Oh, and my 22" 2 piece Lowenhart LD1 10.5" with a 295/25 weigh in between 75 and 80 pounds (On my '96 Impala SS).

The bigger problem with a 22 is the no sidewall = tires spin MUCH EASIER. Where's the rotating mass fall with that one, if you aren't even hooking? ;)

No one here is destroying the car, it's a 4 door sedan. That means that it is not expected to be a race car (unless you are 16 and drive a WRX). Not everyone gives a hoot about going to the drag strip, racing the car, or it even going fast. You want to talk about people destroying guys, go on the Porsche forum. Hell, the Corvette forum will work too.

Not trying to fight with ya, I'm just saying...

I know of numerous forged 20's that weigh less than 34 pounds... Going bigger isn't necessarily a problem if you're willing to fork out the money for lightweight forged wheels.

fyi many of the higher end forged 19" wheels I have used/seen weigh close to 20lbs


i agree. I have a 20x10 rim from I-forged and it only weigh 27 lbs.

Adding more rotating mass to the drivetrain to turn will definetely make you slower plus it will not make friends with your transmission in the long run. I don't know how many escalade,etc vehicles i have seen getting trannies rebuilt because of their heavy ass wheels on the vehicle

Hey, no problem, if your not concerned about weight then by all means put whatever on your car. I think the big wheels do look cool and I had 22's on my 300 and they did weigh 85 lbs. My point was this guy comes on trashes me for making a point. I have 20's on my truck and if gm would have put a taller tire on the stock version of the g8 I would have probably went with a 20. These cars are programmed for the height of tire and rotating assembly. A taller tire and wheel may cause problems with the computer. My 300 lugged around because the tire was an inch taller then stock. The short sidewall, at least here in Missouri is disaster waiting to happen. My point is and I don't want to fight about it either, I purchased a car with 361 hp, I just don't want to sacrifice the power to got to a larger wheel. I was only giving information that had been asked in another thread. I didn't pay $3000 for these wheels, much less then that. I did pay almost $3000 for my 22's and tires. 22's on an impala, thats the ticket. Mine had 20's with air ride. I like the big wheels, I have the money and don't have to worry about much. Just waking up every morning is my biggest worry. Lets get on with something else and park this thread in the garage.

My point is and I don't want to fight about it either, I purchased a car with 361 hp, I just don't want to sacrifice the power to got to a larger wheel.

Lets get on with something else and park this thread in the garage.


Good points. You provided good information that is pertinent. Anyone can do whatever they want with that information. There is a performance hit to a heavier wheel / tire combo that might matter to some folks and not matter to others. It is still factual info regardless.

Another concern is tire selection for your chosen size. I believe 18's are kind of a weird size and they have a bad selection and are not common. I believe 19's have a better selection of performance tires for a car. 17's would probably be the best but I am not sure how it would look or if it would fit the brake system ( especially on the up coming GXP model with the 14" or so brakes ). Honestly if it were me, I would be concerned about the wheel weight because I do care about performance and it also means parts will fail faster and mileage goes down.

Thanks everyone, its the usa and we can all have what want and agree and disagree. In ussr you get what they give you.

locrzng888 is right. Rotating mass, at speed, can have an enormous effect on driving dynamics, far more than its static weight in relation to the mass of the other static parts of the automobile. This can affect the acceleration and deceleration of the car as well as it's ability to change direction. Also, unsprung mass (anything not suspended by the car's springs) makes a major difference in the suspension's ability to work accurately.

I just put a set of 26.5" on my G8. No room for tires so I painted the surface Black! Eliminating the tires saved over 22 lbs a wheel! Doesn't handle great, but MAN WHAT A LOOK!

Dude you got pics?

With or without the Highway cop?

RRM

LOL - you guys made my day! (PS... most people don't race their G8 at the track - but some do - check out the aussie vids!!!! These cars are practically v8 supercars overseas!)

http://www.youtube.com/watch?v=PfbWXspdDUU

New record for thread necro? 3 years and 4 some odd months? :wink2:

take your back seat and carpet out and you will go even faster..dont forget to weigh your brake fluid .that would be worth a little more speed to..
quote::
I can tell just a slight difference with only 10 lbs on the rear and 6 on the front. I don't think my car runs as strong on the bottom end. Good luck, post if you got
that's bull ****....stop watching myth busters buddy


My only response to this: YOU DON'T KNOW SH*T BUDDY

Sorry for being blunt, but DAMN you're wrong:judge:

Yeah forget about the size for a second (although running extreme low profile w/ no sidewall is another detriment to performance in certain applications), the weight of sprung vs. unsprung mass is big deal - rotational mass. A low profile tire can help in cornering/steering feel, but can hurt in 1/4 mile straight line acceleration some, which is why many people drop the psi, it "squishes" the tire at the initial squat of WOT acceleration, creating more surface area and more supple grip for a better launch.

Here's some reading for you:

http://en.wikipedia.org/wiki/Unsprung_mass

http://physics.bu.edu/~duffy/py105/Torque.html (http://physics.bu.edu/%7Eduffy/py105/Torque.html)

http://spiff.rit.edu/classes/phys376/moment.html

Bottom line, lighter wheels and brakes are a VERY REAL performance benefit