How to correct the tire size in the computer - - Home of Canadian Ford Truck Enthusiasts
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post #1 of 4 (permalink) Old 09-02-2008, 10:20 AM Thread Starter
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Join Date: Dec 2007
Location: Bailieboro,Ontario
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Exclamation How to correct the tire size in the computer

What do I have to do to change the tire size in the computer to get my speedo to the right speed as I went from 275/60/17 to a tire 265/70/17 the tire guy told me that the speed wont be out much but when i checked a tire calculator it says its out about 5.1 km is there a way to fix it thanks
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post #2 of 4 (permalink) Old 09-02-2008, 03:30 PM's Avatar
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2 ways you can change this
One get the dealer to do this for you or Buy a programmer and you can change it yourself
Either way this will cost you some money

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post #3 of 4 (permalink) Old 09-02-2008, 03:59 PM
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Programmer would probably be better as it comes with the capability to increase your fuel mileage - your dealer doesn't!

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post #4 of 4 (permalink) Old 09-02-2008, 05:48 PM
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Location: Burlington
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98 and older models use a speedo gear you cant correct tire size with a programmer like on 99+ models the speedo gear must be changed , easy fix.

use this link

put in your gear ratio you have, tire size, 265/70/17 = 31.7

and Drive or Driven Gear teeth put in 8 for that and you should be bang on

post back what you come up with and I can find the Ford part # you need to order from the dealer
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