Speedometer calibration versus wheel size

Discussion in 'Gen III 2010+ Prius Main Forum' started by hybridtwins, Mar 21, 2009.

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    hybridtwins New Member

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    Does anyone know if the speedometer of the 2010 Prius is calibrated differently depending on whether you order a factory package that includes 15" wheels versus a package that includes 17" wheels?
    hybridtwins, Mar 21, 2009
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    fuzzy1 New Member

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    I don't know directly, but it shouldn't need a different calibration, or at least not much. The raw 17" tire diameter is 1.5% less than the 15" tire, but this does not account for effective rolling circumference. For the simple-minded calculation, see the earlier preliminary Prius info thread.
    fuzzy1, Mar 21, 2009
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    hybridtwins New Member

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    Also a related question: since turning diameter is about 2 feet larger with the larger wheels, would a mechanical adjustment have to be made to the steering if one size wheel were swapped for another by a dealer?
    hybridtwins, Mar 22, 2009
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