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Wheel size change speedo?

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El Futura Boy

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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FordFairmont

Posted: Thu Jan 03, 2008 8:02 pm

Getting Side Ways

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google tyre calculator

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revcore

Posted: Thu Jan 03, 2008 8:06 pm

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VIC, Australia

http://www.miata.net/garage/tirecalc.html

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Paulmac

Posted: Thu Jan 03, 2008 11:41 pm

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http://www.fordmods.com/forums/documents.php?doc=30
Paul

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Krytox

Posted: Thu Jan 03, 2008 11:55 pm

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Power: 142 rwkw

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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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RedRoo

Posted: Fri Jan 04, 2008 12:49 am

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Ride: 94 ED Fairmont, MY97 LE WRX

Location: Seymour
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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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