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Old 01-13-2012, 02:53 PM   #11
Royal Tee
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Originally Posted by cacophonous View Post
Your stock tires are 235/40R18 which have an outer diameter of 25.4"
You would want purchase 215/50R17 tires which have an outer diameter of 25.46"

The difference is .06" which would throw your speedometer off by 1/10th of a mile at 65 MPH

Personally I went with 15" Alloys and 195/65R15 Blizzaks which has the same approx outer diameter as my stock 17" Black & Machined rims 215/50R17 tires. My speedometer is off by 1-2 miles at 65 mph. I paid 50.00 for the used rims and 371.00 for the tires (out the door) at Costco.

The 15s are cheaper and work better in the snow since they are narrower. They also have as higher sidewall which is better for pot holes, etc.
Originally Posted by JMD787 View Post
I have the 18's as well. I went with a 15" wheel and snow tire. Keeps the cost down. The closest match to keep the speedometer accurate is 205/65/15. Tire Rack recommends a 195/65/15, but the speedo will be about 1.5% off. With the 205 it's only 0.3% off.
Great info fellas!
So aorn, If I want to get a set of winters and maintain accuracy for my 18" setup,
I have:
15" + 205/65/15 = 0.3%
16" + ?
17" + 215/50/17 = 0.06%

Now, other than having a TPMS installed is there anything else I really need to know before purchasing?
I honestly am putting aesthetics on the backburner for winter tires.

again, Thx!
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