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Eric
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On 4/17/2020 at 11:40 PM, railfancwb said:

I wonder how often the speedometer gearing is changed to compensate for changes in tire OD and/or differential ratio. 

Tire diameter can be changed up or down within limits without changing wheels. 

Long ago I found that the dealer has different gears to adjust the speedometer readout.  Of course the selection is limited so you get as close as you can.

I had a new car that agreed with  an external GPS so well I wondered if it used GPS for corrections.  Most likely not, but still it was quite accurate.

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