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Old 12-29-2008, 08:53 PM   #1
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18" rims vs 20" rims...Why go smaller?

I see a lot of post stating they want the 18" rims. I thought I knew about tires, but times have changed. Why would a person choose 18" rims over 20" rims? Is it just cost, or performance?
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Old 12-29-2008, 08:55 PM   #2
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Anytime you can lower your unsprung weight or decrease the weight of rotating mass you will have a faster car, Plus you are limited to a smaller selection of performance tires with a 20" rim.
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Old 12-29-2008, 09:09 PM   #3
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Are the run times for the camaro listed with 20s or lower tire sizes? Are we really talking for track use, or is it a noticeable difference for street use?

I am getting 20s, and will probably do many stop light jumps with the competition, but most likely will never take it to the track to do a 1/4 run.
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Old 12-29-2008, 09:22 PM   #4
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Edog, I think for those people just sticking with red light racing against Mustangs and the like, it won't make that big of a difference (especially with the V8).
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Old 12-29-2008, 09:47 PM   #5
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Cool, thanks guys!
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Old 12-29-2008, 09:51 PM   #6
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It also helps the ride/handling balance.
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Old 12-29-2008, 10:00 PM   #7
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Is smaller smoother?
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Old 12-29-2008, 11:08 PM   #8
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Smaller wheels allow for taller sidewall tires (assuming overall diameter remains constant). Taller sidewalls allow more flex. There is more rubber between road imperfections and the rigid wheel.
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Old 12-30-2008, 12:14 AM   #9
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IMO 18s are way to small

I have 19s on my stang and I wish I would of went bigger... I am thinking 20s or 22s for the camaro
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Old 12-30-2008, 03:36 AM   #10
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And IMO 20's are way too big. I personally like the look of a nice 16-18 inch rim myself. I'll be picking up a set of the steelies and having them widened to 8.5 inches, and then wrapping them in KDW's. I'll have to have the speedo recalibrated, because the total diameter will be smaller, but thats not a big deal to me. I'll be getting nicer tires and a drop at the same time. The stock rear tires will be burned off for the purpose of photo sessions (after the car is broken in, of course) and then replaced with snow tires to make my winter set. Hopefully I can find some in the same diameter as the KDW's I get - that way I don't have to worry about the speedo being inaccurate in winter.
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Old 12-30-2008, 03:44 AM   #11
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Smaller wheels allow for taller sidewall tires (assuming overall diameter remains constant). Taller sidewalls allow more flex. There is more rubber between road imperfections and the rigid wheel.
What he said. More rubber on the ground (with air let out...20psi or so) helps in traction for 1/4 mile racing. Imagine letting some air out of a 28 inch tire on a 22 inch rim. Not too much rubber on the ground. But, now add 4 more inches of tire by going w/ an 18 inch rim. Go back down to that same 20 psi. More rubber on the ground.
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Old 12-30-2008, 07:27 AM   #12
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All depends on what you use the car for. If you want better handling and feel for the road, a shorter sidewall is better but you may not get as much traction for drag racing. If you want taller sidewalls to soften up the ride and allow you to lower the pressure for better off the line traction you will lose some feel for the road and its gets mushier in the turns. But also, there is no rule that says you have to have short sidewalls with a 20" tire. They come in 50 series also. You just have to recalibrate the speedo to maintain the accuracy if you want both because you will increase the height of the combo. Which isn't always a bad thing, if you want to change the rear end ratio without changing the ring and pinion gears.
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Old 12-30-2008, 12:01 PM   #13
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yeah if you wanna look good get 20s if you wanna go fast opt for the 18s yo

lol
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Old 12-30-2008, 12:50 PM   #14
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I thought we had to go at least 19s on the SS to make room for the brembo's???
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Old 12-30-2008, 12:50 PM   #15
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yeah if you wanna look good get 20s if you wanna go fast opt for the 18s yo

lol
So 19s then...best of both! LOL! J/K!

I'll look at a smaller rims (18s) for the track for sure but 20s will do fine for my day to day driving!
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Old 01-01-2009, 02:24 PM   #16
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I'll still be going with some 18's. In fact, I'll be picking up some of the 18 x 7.5 rims off the LS. With the rubber I'm looking at wrapping them in, that should give me a section width of 9.7 inches all around. Close enough to my goal of 10.
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Old 01-01-2009, 02:27 PM   #17
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I'll still be going with some 18's. In fact, I'll be picking up some of the 18 x 7.5 rims off the LS. With the rubber I'm looking at wrapping them in, that should give me a section width of 9.7 inches all around. Close enough to my goal of 10.
- Xanthos
7.5" wide rims......
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Old 01-01-2009, 02:33 PM   #18
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7.5" wide rims......
Yeah, well, when you have as little money as I do, you cut costs where you can. I'll be lucky to even be able to afford a camaro - much less more expensive rims.
- Xanthos

P.S. - not to mention that this car will be my daily driver and the thinner tires will help in snow/rain.
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Old 01-01-2009, 02:39 PM   #19
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So 19s then...best of both! LOL! J/K!

I'll look at a smaller rims (18s) for the track for sure but 20s will do fine for my day to day driving!
I'm pretty sure you won't be with the Brembo's on your 2SS. I believe you'll need 20's to clear the brakes.

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Old 01-01-2009, 05:42 PM   #20
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Yeah, well, when you have as little money as I do, you cut costs where you can. I'll be lucky to even be able to afford a camaro - much less more expensive rims.
- Xanthos

P.S. - not to mention that this car will be my daily driver and the thinner tires will help in snow/rain.
is that what they tell you?


if you spend some time looking, im sure you will be able to find a set of wheels you can afford. or if you set a lil money away here and there. who knows, you might end up with a deal the way I did for my Z06 wheels, $300 bucks for the rims with tires (~10,000 miles on them) and spacers.

never know what you might find.
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Old 01-01-2009, 06:32 PM   #21
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Does the blue GS show car have 18's? If so, other 18's should fit over the brakes. I'll be seriously considering welding a band in those steelies depending on offsets. Why? Because I can...And the uninformed will think he's about to spank a base V6.
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Old 01-01-2009, 08:45 PM   #22
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is that what they tell you?


if you spend some time looking, im sure you will be able to find a set of wheels you can afford. or if you set a lil money away here and there. who knows, you might end up with a deal the way I did for my Z06 wheels, $300 bucks for the rims with tires (~10,000 miles on them) and spacers.

never know what you might find.
Or you could realize that not everybody is in the same situation as yours. Right now I don't have anywhere near the money to buy a camaro - I'm putting everything I have into savings and still coming up far short. As far as wheels go, I love the look of the LS wheels and I should be able to trade in my stock 1LT rims to the dealer for a set at extremely little or no cost. I already found the set of tires that would fit the LS rims and work for what I want and the difference in section width between the tires for the 7.5 inch wheels and the tires I'd like to have for 8.5 inch wheels was only .4 inchs - not nearly enough to merit the cost of having them widened. At 9.7 inches the section width was plenty wide enough for me.

Like I said, some of us just want a camaro and have to cut costs where we can. One of those places is by NOT putting money aside or creating an expenditure for rims. Unless you've got 500 bucks you're willing to give me, how about you let your car be your car and my car be my car.
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Old 01-01-2009, 08:54 PM   #23
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With that little rant your gonna make Greg Norris turn into Chuck Norris, then we are all screwed
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Old 01-01-2009, 09:33 PM   #24
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With that little rant your gonna make Greg Norris turn into Chuck Norris, then we are all screwed
i think Chuck could still take him!
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Old 01-01-2009, 10:05 PM   #25
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Does the blue GS show car have 18's? If so, other 18's should fit over the brakes. I'll be seriously considering welding a band in those steelies depending on offsets. Why? Because I can...And the uninformed will think he's about to spank a base V6.
The Koni Challenge car is running a different brake package altogether. It's got Brembo calipers in the front but it looks like 1 piston sliding calipers in the rear. On the SS, the rear setup is larger.

Again, the 1st Generation CTS-V ran the same sized brakes and calipers and came stock with 18s. It's not that 18" wheels won't fit over the rear 14.4, it's that you're going to have to do some research and trial and error (or have a high end custom wheel company like CCW make you a set) to find 18s that will work.
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