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I took off my stock rims and tires and put on 17" wheels and tires.will this affect an acurate reading on my speedo?
 
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Yes and i learned the hard way. I had a 95 v6 with 15 inch wheels. I put on a set of 17 inch GT rims from a 95 GT. Well i was going 61 i thought in a 55 and the officer said i was going 65. This is when i figured out that the speedo was off and other confirmed this would do it. I dont know how u correct it on the newer stangs, probably with a reflash of the computer i would say but dont know for sure.
 

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mrsxty52u said:
I took off my stock rims and tires and put on 17" wheels and tires.will this affect an acurate reading on my speedo?
Only if you change the over all tire size (outside diameter)... What's your new tire size?
 

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