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OK, I went from the stock 15 inch tires to new 205/40/17.....what I was hoping to find out was will this change affect my speedometer and if so, by how much?
 

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Nope, and if there is I couldn't notice one when I had 40's. The total radius is just a small fraction smaller than the 15" setup. So if there is a difference your car will be going slower than you think it is.
 

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