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tire size + speedo + aftermarket wheels

Discussion in 'Gen 3 Prius Accessories and Modifications' started by dopey423, Nov 9, 2010.

  1. dopey423

    dopey423 New Member

    Joined:
    Oct 7, 2010
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    Location:
    Silicon Valley, CA
    Vehicle:
    2010 Prius
    Model:
    II
    so the stock 15's are 195/65/15 and the 17's are 215/45/17.

    according to tire size calculations, this would result in a 1.4% increase in speed vs the speedo.

    are Prius V's ecu's tuned for these tires?

    i have a Prius II and am thinking now i need to get 225/45/17's to make sure my speedo is correct.

    please chime in
     
    #1 dopey423, Nov 9, 2010
  2. mainerinexile

    mainerinexile No longer in exile!

    Joined:
    Mar 14, 2010
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    Location:
    Maine
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    I'm not sure the accuracy of the speedometer is predictable in advance.

    My speedo was dead-on accurate when I bought the car in April. But the wheel alignment was so bad that we ruined two tires. Toyota gave me four new tires of the exact same size and brand as the OEM tires in August, and now my speedo reads 4 mph slow. Go figure.
     
    #2 mainerinexile, Nov 9, 2010
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