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Weres the diff ratio/speedo/wheel/tyre size program? 

 

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 Post subject: Weres the diff ratio/speedo/wheel/tyre size program?
Posted: Thu Dec 06, 2007 10:42 pm 
Getting Side Ways
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There used to be a program that you entered your diff ratio, tyre size, etc. in and it told you how much your speedo is out.

I'm just wanting to check that 255/40R18's are correct tyre size for a 9" wide rim...

 

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Posted: Thu Dec 06, 2007 11:05 pm 
Getting Side Ways
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I don't think this will answer that question but here's the speedo calc link...
http://www.fordmods.com/forums/documents.php?doc=30
Paul

 

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Posted: Mon Dec 17, 2007 7:39 am 
Getting Side Ways
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Yeah, that helps. Tells me that there's a 2.12% difference between the factory original rear wheels/tyres and the new ones. So when I'm on 100 km/h now, I'm actually on about 97.

 

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