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195/65 tire

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by nicnacpatwac, Sep 11, 2016.

  1. nicnacpatwac

    nicnacpatwac New Member

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    today I decided to replace my nearly balding tires to the 195/65. I'm glad I did! ride is nicer, higher profile looks better, and my speedometer is now correct and not 2 MPH faster than with the 185/65 tire.
    even if i lose 1%-4% in "actual MPG" it is well worth it.
     
    #1 nicnacpatwac, Sep 11, 2016
  2. exstudent

    exstudent Senior Member

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    Did you perform a dynamometer speedometer test to verify the new speedometer readings? AAA has a mobile speedometer vehicle check for members (insured or roadside service).
     
    #2 exstudent, Sep 11, 2016
  3. Mendel Leisk

    Mendel Leisk Senior Member

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    I've never been able to understand the need to "correct" the speedo by this method. A lot of less trivial things are now incorrect, lol.
     
    #3 Mendel Leisk, Sep 11, 2016
  4. bisco

    bisco cookie crumbler

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    i thought 195 was standard, or is that a change for gen 3?
     
    #4 bisco, Sep 11, 2016
  5. Mendel Leisk

    Mendel Leisk Senior Member

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    Second gen stock size was 185/65R15. So going to 195/65R15 increases the outside radius almost 1/4", amounts to a 2% decrease in revolutions per mile.
     
    #5 Mendel Leisk, Sep 11, 2016
    bisco likes this.
  6. Mendel Leisk

    Mendel Leisk Senior Member

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    Speaking clinically, the increase in radius is .65x10 (mm).
     
    #6 Mendel Leisk, Sep 11, 2016
  7. nicnacpatwac

    nicnacpatwac New Member

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    I know this is not acurate, but...
    With my GPS app on phone with the 185, I noticed it was 2mph different, so I went to my other vehicle and it was =.
    So after other reviews I decided to try the 195.. more for profile and ride, not for speed accuracy. If I'm off 1 or 2 mph, no big deal, but at work we have radars, so I'll try to see this week if my speedometer with the 195 is accurate.
     
    #7 nicnacpatwac, Sep 11, 2016
    bisco likes this.
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