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tyre size effecting the speedo?

  • ne-crock
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08 Jun 2012 16:43 #41981 by ne-crock
tyre size effecting the speedo? was created by ne-crock
Hey

Is there a way of adapting your speedo to tell you the correct speed if you put larger tyres on, my new tyres are going to be 12% bigger so it will have an effect on my speedo if i'm correct in my thinking?

cheers for any help,

crock

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  • Sam_
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08 Jun 2012 17:02 #41983 by Sam_
Replied by Sam_ on topic Re: tyre size effecting the speedo?
not sure this will be any good for you, but might be worth a read :)

www.bigjimny.com/images/documents/poor-mans-jimny-speedo.pdf

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08 Jun 2012 21:48 #42019 by kirkynut
Replied by kirkynut on topic Re: tyre size effecting the speedo?
Have a drive with a Sat Nav on to see what speed that says your doing, I think they are generally more reliable than a car's speedo, especially the faster you go! You may find it's not far out!

My Mrs BMW is near spot on what the sat nav says at most speeds. My Micra shows 80MPH on the speedo but the same sat nav shows it at 72MPH ish!!! The Micra is as it left the factory aside from some rust!

Kirkynut
The underdog often starts the fight, and occasionally the upper dog deserves to win - Edgar Watson Howe.

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  • ZookFastback
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09 Jun 2012 00:24 #42046 by ZookFastback
Replied by ZookFastback on topic Re: tyre size effecting the speedo?
I use this tyre size comparator to check the difference between original and proposed new size...

www.exploroz.com/Vehicle/Tyres/SizeCalc.aspx

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09 Jun 2012 10:11 #42068 by kirkynut
Replied by kirkynut on topic Re: tyre size effecting the speedo?
Calculators work for the theoretical size but often they are bigger or smaller than the size marked on the side wall, so a tape measure is needed.

A pain in the arse!

Kirkynut
The underdog often starts the fight, and occasionally the upper dog deserves to win - Edgar Watson Howe.

My Jimny Thread Here: www.bigjimny.com/index.php/forum/8-my-ji...on-continues?start=0

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