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Wheel size change speedo? 

 

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 Post subject: Wheel size change speedo?
Posted: Thu Jan 03, 2008 5:01 pm 
Oompa Loompa
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Ride: El Futura

Location: Langwarrin
VIC, Australia

Hay I currently have these size tyres on my el falco futura - R17-225-50
and am going to change to R-17-235-45 .
What percentage will my speedo be out because the outer tyre diameter will be smaller?
cheers

 

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Posted: Thu Jan 03, 2008 8:02 pm 
Getting Side Ways
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google tyre calculator
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Posted: Thu Jan 03, 2008 8:06 pm 
Getting Side Ways
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Posted: Thu Jan 03, 2008 11:41 pm 
Getting Side Ways
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http://www.fordmods.com/forums/documents.php?doc=30
Paul

 

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Posted: Thu Jan 03, 2008 11:55 pm 
Technical Contributor
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Or you could install a Police cluster and calibrate it yourself!

http://www.fordmods.com/forums/documents.php?doc=14


More accurate than stock speedo gears not designed for alternate wheel/diff ratios!

 

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Posted: Fri Jan 04, 2008 12:49 am 
Getting Side Ways
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If your speedo is correct now at 100Kph with the old tyres you will be doing 98Kph with the new tyres.
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