Speedo Accuracy
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New User
Joined: Jul 2005
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Speedo Accuracy
I realize that a larger than stock tire size will affect the accuracy of the speedo. But, does anyone know or have specific ratios of mph/tire size. I was pulled over recently with my cruise set at 58 and the officers radar read 66. I didn't realize there would be this much discrepency. Also, does this gap become larger as speed increases? Is there a procedure to reset the speedo to read correctly based on the new tire size? Thanks.
New User
Joined: May 2005
Posts: 2
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There are some useful calculators here.. www.csgnetwork.com/automotiveconverters.html that might help.
Cargo Master
Joined: Aug 2004
Posts: 2,899
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From: Lynnwood, WA
The speed difference can be calculated from the diameter ratios, and there are several calculators are out on the internet. The speedo can be recalibrated on the Bronco, but only a grand total of six times. (on a '95, to be precise) There are add-in boxes that connect to the VSS in the rear end that can correct for a larger size of tire. They're about $150 - $200 ATM. They're useful if to plan to change your tires often. (i.e. have 2 sets of different size)
