Wheels/Tire Combo

[Bernie Benz]

> From: "Mike Del Tergo" <mdeltergo at hotmail.com>
> 
> Interesting, One 200 avant spot on, the other -5MPH above 55 MPH as noted by
> GPS.
> Now, if MPH off, is odometer off by same amount?  No measured miles close by
> to calculate.
> Mike
My previous response to this thread was:

A more considered method might be to check the odometer over a 5 mile
roadside measured course.  You may well find that the stock tire size does
not give the correct odometer reading, hence you can adjust your new tire
size to correct this error.  Once you get this right, you can then measure
the speedo time error over the same course at an indicated 60 MPH and
calculate the % error.

Most hiways have mileage markers at regular intervals and to mark specific
road assets, such as bridges.   Go shopping!

Bernie