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So I have a 2008 SRT8 with stock rims and 245 45 r20 tires. I believe these are the stock tire size. I'm about to buy new tires. I've put the H&R springs on my car and lowered it a bit. Can anyone help me with the tire size that will work with out rubbing? I want to go wider in the back for sure and maybe front. Can I go 275 in the rear or even 305? And then 35? Or stick with 45? I'm keeping the stock rims.
Thanks for your help.
 

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In 2008, the standard tire size was a Goodyear Eagle 245/45-20 in a 9-inch wide Alcoa forged aluminum wheel. A 275/40-20 tire is the widest that you can go on a stock wheel for it to perform and wear properly.

Here is a photo of a 275/30-20 Cooper Zeon RS3-G1 tire mounted on the rear of my 2009 SRT.
 

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