arispoli Posted January 18, 2014 Report Share Posted January 18, 2014 I am thinking of picking up a set of 20" Shelby Razor wheels & tires. I currently have the 235 50 18s that came on my 08 SGT. The 20" Razors come with 255 35 20s. My question is will this require me to change the tune on my car? Will it through the speedo off? Thanks Quote Link to comment Share on other sites More sharing options...
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