I just bought an 03 SSEi with Chrome wheels. My question is this...The original tires are still on the car GY RS-A'*. I would like to add a little meat to it. How big of tires can I run on the original wheels (7" I think) without affectiing the speedometer?

My research shows 255/50 x 17 should be a direct replacement. Any comments?

Yep, that should keep your speedo. relatively close. 690.3 vs. 686.8 mm.

A little over an 1/8" difference in diameter. You won't notice it.

http://www.paspeedo.com/calculator.htm

harry, thanks I guess my big concern now is wheel width.

Well, 20 mm is a little over 3/4". I would think it would be fine. We'll see if somebody else wants to chime in that may have gone wider than stock.

well mine are 245/45/18'* and dont rub.

I cant honestly say with 255/50'* but it sounds safe.

Yes, 255/50'* are the ones. SIlverBullet has Potenza'* in that size and no they dont rub.

Thanks for the feedback. We are going to get some miles out of these Goodyears but when the time comes to put on new shoes 255/50'* are going on it.

You'll be fine treat the fine American car to American tires. I hate it when Toyota'* get FIrestones, and uhhh Chevys get Toyos.

alot of us with the 17" wheels move up to 255/50-17 tires.
i had 65k on my Michelins (235/55HR17) darn good tire , just wanted a wider tire and the BFG'* G-Force T/A KDWS only set me back $132.00 (US) a tire. the BFG'* have the same treadwear rating (400) as the Michelin'* so i hope to get about the same mileage. the 255/50-17 tire has the same diam. as the stock tires just a little wider. the car looks good with the wider tires and they dont rub at all, GM should have offered the 255'* as a option.

ROD

Thanks, rrounds that was the info I was looking for.