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Speedometer reading error

  • 2002
  • Boxster S
88 000
Wheels and Tires
Post Falls, 


  Seems there is a common problem with Porsche (as related to me in casual conversations).  That is the speedometer reading 4-5 mph over the actual speed - as recorded by GPS. Arguments have been wheel size to actually calibrating the speedo.

   Is there a responsible and practical solution to this? 

  FYI: in may particular case, the tires are factory on a Boxster S.


Appreciate the time and attention to this issue!!!


Kurt A. Neumaier
Post Falls, ID

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