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Tire ratio effecting speedo reading?

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    #16
    Originally posted by simon kuether View Post
    Hey Chuck. ... I got Deb to run at 100kph in our car (a reasonably late model Toyota) on a straight bit of road and checked my speedo against that. ...
    I still would not use that as a 'true' speed.

    We have two Toyotas that we consider to be "reasonably late model" (they are only 9 and 12 years old). When compared to the speed shown on a GPS, her indicated 70 mph is actually 67 on the GPS. When mine is showing 70, the GPS is, too.

    Yes, sometimes they are correct, but other times they are not.

    By the way, both of them are still wearing original-size tires, so that is not a problem.

    .
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