12-09-2021, 05:59 AM
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#8
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Senior Member
Join Date: Mar 2012
Location: ripley ny
Posts: 2,887
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Re: speedometer calibration
Quote:
Originally Posted by AJC
You will need a correcting adapter with a ratio of 1.281779661 or as close as possible. Now if your 33" tires run +/-0.5 of an inch, you could still see up to a 3% error. Which would be +/- 2 MPH at 65 MPH.
Attachment 2150855
Here is a GoogleDoc I made that you can play around with tire size and gearing. The formula is from Speedometer Cables USA under "Need a correcting adapter".
CORRECTING_ADAPTER_CALCULATOR |
thank you!
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