: Wheel and Tire Question

04-22-11, 11:03 AM
I found some wheels for my 06 STS V6 that I can buy reasonable. I would like to have a second set of wheels that I can put on in the winter with Blizzak's. The problem is the wheels I am looking at are 18" wheels. The factory setup is 17" wheels with the back ones being 17x8 and fronts 17x7.5's. Will I have problems with the 18" wheels or will they work OK for me. The problem is not whether they will fit as much as it is a question about handling, ride, gas mileage, and speedometer accuracy. Any feedback would be helpful.



04-22-11, 11:38 AM
As long as the tire diameter is pretty close to the 17 inch wheel/tire package you'll be fine. As you go up in wheel diameter (18's) you'll have to go to a lower profile tire to maintain overall matching diameter; shouldn't be hard at all to get this done (if they make Blizzacks in lower profiles).

John Wicz
04-22-11, 06:30 PM
Generally for winter wheels/tires, you'd go with smaller diameter wheels and a higher profile tire.

04-22-11, 07:16 PM
In what condition are your 17" tires? With differing sizes, I'd be inclined to go with Summer tires on the 18's.

This site will make it easy to compare/contrast tire sizes:

Click Here! (http://www.1010tires.com/TireSizeCalculator.asp)

04-22-11, 07:47 PM
Thanks for the information. I may put summer tires on the 18's and put winter tires on the 17's. The tires on the 17's are in good shape but I am not terribly crazy about the tires from a performance standpoint. The previous owner put the same size tires on all wheels even though the back wheels are wider. I bought the car right so if I need to put a little extra cash into the tires I could do that without feeling bad about the investment. I like the idea of having a set of winter wheels and tires and a set of summer wheels and tire. The road salt is very hard on the wheels in Minnesota. I like the looks of the 18" wheels so I would not mind going this route I need to see the wheels before I buy them. I want to make sure they are not trashed or bent before I shell out the coin for the wheels. I just wanted to do a little research before I bought something I could not use. I know there are a lot of people on this forum that have experience with the topic.



04-22-11, 07:59 PM
Why does tire rack say that the 06 STS V6 has 18" oem rims?

04-22-11, 09:05 PM
Some do. There are 3 tire options.

Base = all 4 are 17x7.5 mounted with 235/50's
Performance = 17x7.5 Front 17x8 Rear with 235/50 & 255/45 respectively
Luxury Performance = all 4 18x8 mounted with 235/50 Front & 255/45 Rear

04-24-11, 12:05 PM
Yeah, the 18" wheels were included if the V6 car had the 1SC package.