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I found a deal on some tires.They are 225/50/18.Will these fit a stock 08 SS wheel??Stock size is 235/50/18.
 

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They will fit, but they are narrower which means less grip, and not as tall which means the speedo will be off.
 

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Yes, they will fit, but ...
At the tire size face value, the proposed set will be about 1/2 inch narrower and 1/2 inch short than the current set.
On the other hand, tire sizes aren't exact between manufacturers or even between model lines of the same manufacturer - so the difference may be a tad more or a tad less than face value.
 

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You'd be better off with a 245/45/18. Yes the speedo will be off by about 2mph, but the cost of the tires goes down quite a bit(well in my neck of the woods).
 

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What about a 255/45? That brings you much closer to the correct diameter, only off by 0.8% instead of 2.1% with the 245
 

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255 is pretty wide for the rim IMO. I like the 245/45/18 idea if those tires are in fact cheaper. I would not go narrower than 225 or wider than 245...thats just me.
 

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What about a 255/45? That brings you much closer to the correct diameter, only off by 0.8% instead of 2.1% with the 245
IIRC, there was only a couple of brands of 255's that will not bulge on the stock 7.5 rim and I think they were the cheap chinese brand crap. I know there's been quite a few that have done it and never had issues, but I won't recommend it.
 
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