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Message: [QUOTE="Jassman, post: 1202311, member: 18674"] Here is what I use to re-calibrate tire size..the 20 is the size that comes from the factory..not sure on the 18...but see the speedo difference on far right. [url]http://tire-size-conversion.com/tire-size-comparison/[/url] Ford can not adjust above the largest tire size..so the 34.1 is the largest. I used this on my 15... [url]http://www.autoanything.com/performance-chips/61A3757A0A0.aspx[/url] if you hold out you will be able to get it around 179.00 after they know you are looking for it... It will not be accurate until you mearsure the new tire on level ground and use that figure. I had 34.1.. 20's..and went to 37x12.5x20...After measuring vs using 37" and on the 3rd time finally figured out what I was doing wrong.. I used 35.75" after compression at the outside edge and she is accurate. This will save you many steps. Good Luck. [/QUOTE]

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