Now that I've hit 16k miles, it looks like I need new tires on my V. Here's what I'd like:

* I'm only interested in run-flat tires... I've had three flats in 16k miles, and every one of those flats I got in a city away from home.
* I'd like wider rear tires than 255 - after the performance upgrades, its harder to maintain traction on hard acceleration.
* I'd like to see options that will allow me to keep my stock rims... but this is flexible.

So some options I've come up with are:

* Just forget it, and get the stock tires in the stock sizes and move on.
* The stock Pirelli eufori@ run-flats are available in 275/40R19 which may not fit on the stock 8.5"-width wheels in the rear. The overall diameter would move from a stock 27.03in to 27.66in which is about a 2.28% increase. (I will just get the computer reprogramed to correct the speedo). I will just keep the stock 235/45R19 up front.
* I found that the Goodyear Excellence RunOnFlat tire is also available in 275/40R19 for the rear... and its availble in 245/45R19 which I could put up front.

Assuming that the 8.5" stock rims can't take more than a 255mm width tire - I guess i'll have to upgrade wheels... any wheel/tire combinations that max out the sizes but are still runflat that people can suggest?

I saw this ebay listing where he got 285/30R20's to fit...

http://cgi.ebay.com/ebaymotors/Cadillac-XLR-2004-CADILLAC-XLR-Mint-Condition-WHEELS-HOT_W0QQitemZ260407101811QQcmdZViewItemQQptZUS_Car s_Trucks?hash=item3ca1790973&_trksid=p4506.c0.m245&_trkparms=65%3A13|39%3A1|240%3A1318

Any thoughts and/or advice would be helpful....

I would suggest you check the sizing charts available on the Discount Tire site to see how big you can go on the stock rims.

Also there have been a couple of tire manufacture changes over the years. The newer cars have a run flat with "extended life" wear due to all of the customer complaints on the earlier brands.

See what a 2008 or 2009 replacement brand is on the Discount Tire site.

Unless you are misbehaving like I am prone to do I am told that 20-25k wear is not uncommon....on the newer tires.

Please be sure to also consider the tire/rim clearance both inside and outside of the fender wells i/e it may fit the rim but not the hole.

Regards

Seems like the tires on the 2009 are the same ones. But thanks for the tip about the extended-wear type of tires.