The most remarkable thing about the XLR is the "un-roadsterlike" smooth ride, thanks to Adaptive Ride Control. A guy (Rick) on this forum swears in another thread that we should not go up to dubs, because it causes the car to ride too rough. He makes a case for sticking at 19s. For me, the magic of the XLR is performance AND comfort.standby said:Bill N,
I took the vehicle out with the original setup and then with the 20's and Michilen Pilot Sports and found it to be more glued to the road and especially with quick lane changes. If you think people drool over your XLR now, put some nice 20's on the car.
Makavelli, custom madeEyedoc said:Ouch!
Covered by insurance , I guess.
What type of wheels are those?
My argument (and I wish I did not have to make it) is that bolting on a set of 20" wheels and tires causes more problems than just ride height. As you have found out the ride quality suffers. The other issues are safty and engineering. Your car was designed and crash tested with 18" wheels which were made to a strict tolerance by GM or thier supplier. Changing to a 20" not engineered to these tolerances causes problems when the car is crashed. It could be as much as the difference between walking away and having a crushed leg or worst.1_XLR said:I have 20s on mine and love the look (see my garage) and the handling.
It drives like a slot car!
I have my stock wheels back on again after a year, and while the
ride is much more comfortable, I feel a real lack of control,
and can't wait to get the 20s back on again.
As long as the overall diameter remains the same,
I don't follow Ricks argument , other than comfort, between stock, 19 or 20.
A shorter tire sidewall does have it's drawbacks though....
I had a little misshap.....80mph on the freeway....downed lightpole......
"Hello, On Star.......did you say four flats?"
IT's not so much how much weight total as where it is located. Basically the farther from the center of the wheel, the worse. Think of it like this. If you took a 20LB weight that was perfectly round and placed the front axil through it, the spinning wheel with the weight would not effect much. However, take the same round weight and bolt it out by the edge of the tire, and there is a hugh difference.1_XLR said:Sorry Rick, didn't mean to get you going on this again.
I put 20s on for the looks, first and formost, and I like feel and the handling.
Is it the best thing for the car? Probably not, I'm sure you know better than I and I may have settled for 19s had you originally posted prior to my purchase.
But there's always drawbacks with aftermarket products.
the run flats weigh a ton!
most any wheel combination without them is going to be lighter
Jiminy Christmas! You guys have been busy! I go away for a few hours and you're at it again!1_XLR said:Sorry Rick, didn't mean to get you going on this again.
My spelling is the product of having access to spell checking software since 1980. I am so use to just getting it close and then letting the computer take over that I often spell things consistantly wrong. I guess I should run my postings through MS Word first.aviator said:Jiminy Christmas! You guys have been busy! I go away for a few hours and you're at it again!
1_XLR - sorry to hear about your mishap. I had a guy in a pickup back into my C4 on my second day of ownership. Put a nice impression of a trailer hitch right on the nose. Just picked it up from the repair shop today.
You see, standby, there's controversy in them-thar dubs. As beautiful as they are, Rick makes a convincing case for 19s. And he writes (and spells) like an engineer, so the physics are square with my BSME.
And I really like those rakish pipes. :thumbs
19s or 20s? Whatever the decision, I gave the car to my bride for her birthday in May. (still only has 4,500 miles) If the wheels and pipes just show up on the car, you think she'll notice? :angel :glol
Rick - thanks for your input as well. Your thoughtful insight is always welcome. I've just gotta do some new wheels and a cat back.....now how am I gonna sell it..... :confused