tire size versus speed shown on speedometer

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Nov 5, 2017 | 01:03 PM

wrd0225

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Joined: Jan 2011

Posts: 198

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From: Chaparral, New Mexico

tire size versus speed shown on speedometer

Is there any way to adjust speedometer reading when changing tire diameter size?

Nov 5, 2017 | 02:00 PM

Mikey

Joined: Oct 2009

Posts: 11,057

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From: Perth Ontario Canada

no.

Nov 5, 2017 | 04:20 PM

JagV8

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Joined: May 2009

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From: Yorkshire, England

Er... maybe. Needs IDS/SDD or WDS or the like.

That's "no" for most people.

Best avoided, for most people.

Nov 6, 2017 | 05:22 PM

Rpach10115

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Joined: Oct 2016

Posts: 217

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From: Lindenhurst, NY

If you choose the right tire/wheel combo, you shouldn’t have an issue. If you go to larger rims, go to a lower profile tire to keep the overall wheel diameter the same. Your ride will suffer, but the handling will improve.

Example: going from a 16” wheel to an 18” wheel is easy with a lower profile tire.
I’m running 255/40 on 20” wheels on all 4 corners.
My car originally came with 18” wheels. I have exactly same wheel diameter using the 20” with the low profile tires. The speedo was verified to have the correct reading after installation.

Last edited by Rpach10115; Nov 6, 2017 at 05:26 PM.