15'' vs.17"

Discussion in 'Gen 3 Prius Fuel Economy' started by Caug1, May 10, 2011.

  1. F8L

    F8L Protecting Habitat & AG Lands

    Joined:
    Aug 14, 2006
    19,011
    4,067
    50
    Location:
    Grass Valley, CA.
    Vehicle:
    Other Non-Hybrid
    Model:
    N/A
    That;s odd. TireRack doesn't show a run flat tire in the 195/65/15 or 195/60/15. :confused: The Goodyear site does not show them in the OEM size either. What tires are you running exactly?
     
  2. dustoff003

    dustoff003 Blizzard Brigade #003

    Joined:
    Dec 27, 2010
    1,371
    334
    0
    Location:
    Waianae, HI (Oahu)
    Vehicle:
    2011 Prius
    Model:
    Five
    I looked for them last night and could not find anything either...... Strange?


    Posted from my iPhone via the Tapatalk app.
     
  3. F8L

    F8L Protecting Habitat & AG Lands

    Joined:
    Aug 14, 2006
    19,011
    4,067
    50
    Location:
    Grass Valley, CA.
    Vehicle:
    Other Non-Hybrid
    Model:
    N/A
    If they are run flats then I think they are not the correct OEM size. OEM size for the 2011 Prius 15" wheel is 195/65/15. For the 17" wheel it is 215/45/17.
     
  4. dustoff003

    dustoff003 Blizzard Brigade #003

    Joined:
    Dec 27, 2010
    1,371
    334
    0
    Location:
    Waianae, HI (Oahu)
    Vehicle:
    2011 Prius
    Model:
    Five
    Do you have the original OE 15" wheels or aftermarket wheels. Your saying your car came with the run flats? Were they installed by your dealer? Could you share the specifications with us skeptics, make, model, and size?


    Posted from my iPhone via the Tapatalk app.
     
  5. Caug1

    Caug1 Member

    Joined:
    May 6, 2011
    119
    9
    0
    Location:
    BOSTON
    Vehicle:
    2010 Prius
    Model:
    III
    All i know .lighter tires/wheels get you better acceleration and braking.
    i tested in the 1/4 and dyno. and its 3x.
    C
     
  6. xs650

    xs650 Senior Member

    Joined:
    Jul 2, 2010
    4,539
    1,424
    9
    Location:
    Northern California
    Vehicle:
    2010 Prius
    Model:
    II
    You fooled yourself.
     
  7. bawzp9

    bawzp9 Caries eliminator

    Joined:
    Apr 27, 2011
    21
    1
    0
    Location:
    Oregon, USA
    Vehicle:
    2011 Prius
    Model:
    III
    I WAS WRONG. they aren't run flats. I would have been confused for a long time were it not for PC.
     
  8. xs650

    xs650 Senior Member

    Joined:
    Jul 2, 2010
    4,539
    1,424
    9
    Location:
    Northern California
    Vehicle:
    2010 Prius
    Model:
    II
    Be glad they aren't run flats.:cool:

    Run flats are noisier, rougher riding and more expensive.
     
  9. stream

    stream Senior Member

    Joined:
    May 12, 2008
    2,977
    451
    14
    Location:
    Long Island, NY
    Vehicle:
    2010 Prius
    Model:
    V
    Agreed. Had them on my previous car, and what a difference when they wore out and I replaced them with conventional tires.
     
  10. dustoff003

    dustoff003 Blizzard Brigade #003

    Joined:
    Dec 27, 2010
    1,371
    334
    0
    Location:
    Waianae, HI (Oahu)
    Vehicle:
    2011 Prius
    Model:
    Five
    Cool you would have been a first. Sorry for pestering you. Glad you figured it out.


    Posted from my iPhone via the Tapatalk app.
     
  11. F8L

    F8L Protecting Habitat & AG Lands

    Joined:
    Aug 14, 2006
    19,011
    4,067
    50
    Location:
    Grass Valley, CA.
    Vehicle:
    Other Non-Hybrid
    Model:
    N/A
    I agree run flats are horrible. My old Corvette came with them. I tried to autox with them and it was like cornering on ice. When I swapped the for Nitto performance tires the difference was night and day.
     
  12. Much More Better

    Much More Better Active Member

    Joined:
    Nov 2, 2009
    655
    162
    0
    Location:
    Canada
    Vehicle:
    2010 Prius
    Model:
    N/A
    I don't doubt it for a second. However, I feel that in order to feel the difference, you have to drive the car "athletically." Another member said that he could feel it even under mild accel. I remain skeptical. My 15" Gen II alloys + winter tire is 9lbs lighter than OEM 17 + tire, and I don't feel any difference. Maybe I'm not looking for it.....I certainly don't drive it hard enough to feel it.....or maybe others find what they expect to find.

    Anyway......one of the thrills about the Prius is the mpg. And one of the key ways to get great mpg is driving style. Anticipating red lights and slow traffic is the best way to keep the car in motion, once in motion. So if lighter rims give better accel and braking, how useful is that if we are trying to avoid that as much as we can?
     
  13. macmaster05

    macmaster05 Senor Member

    Joined:
    Sep 27, 2009
    4,028
    714
    5
    Location:
    USA
    Vehicle:
    2010 Prius
    Model:
    Two
    Agreed. Lighter rims, however, confer better mileage assuming you're driving style is the same. But if you're accelerating and braking harder, then yes it won't matter. All depends on what "thrills" you I guess.
     
  14. F8L

    F8L Protecting Habitat & AG Lands

    Joined:
    Aug 14, 2006
    19,011
    4,067
    50
    Location:
    Grass Valley, CA.
    Vehicle:
    Other Non-Hybrid
    Model:
    N/A
    When I said that I can feel the difference between my stock 15s with LRR tires and my 17s with performance tires I did not mean to infer that the difference was due to wheel weight alone. My 17s only weigh 1lb more than my 15s, however, the 17" tires weigh approx. 4lbs more than the 15" tires. I think the tires are what make mild acceleration much more sluggish than my 15s. :)
     
  15. macmaster05

    macmaster05 Senor Member

    Joined:
    Sep 27, 2009
    4,028
    714
    5
    Location:
    USA
    Vehicle:
    2010 Prius
    Model:
    Two
    Oh definitely, especially if the tires are not LRR.
     
  16. F8L

    F8L Protecting Habitat & AG Lands

    Joined:
    Aug 14, 2006
    19,011
    4,067
    50
    Location:
    Grass Valley, CA.
    Vehicle:
    Other Non-Hybrid
    Model:
    N/A
    Aye. My Kumho ecsta ASX are definitely not LRR. Whereas my dB Super E-Spec tires are.
     
  17. Old Bald Guy

    Old Bald Guy Old Bald Guy

    Joined:
    Aug 10, 2008
    89
    20
    2
    Location:
    Ft. Worth, TX
    Vehicle:
    2010 Prius
    Model:
    V
    You mght want to try driving a Prius with the 15" and then a Prius with factory 17" tires. You will notice an immediate difference. Then read the specs on what is different between the cars OTHER than tire size. The Prius V (17") has a quicker steering ratio, different suspension, a LOT better ride, and better handling. Mine is rock solid at 80 plus MPH and I gladly accept the 2 MPG hit the tires give in exchange for better safety, ride, and comfort.
     
  18. F8L

    F8L Protecting Habitat & AG Lands

    Joined:
    Aug 14, 2006
    19,011
    4,067
    50
    Location:
    Grass Valley, CA.
    Vehicle:
    Other Non-Hybrid
    Model:
    N/A
    As longer as your keep the efficient tires it came with and replace them with other LRR tires otherwise mpg can drop precipitously. :) Before they came out with efficient 17" tires most of us were recording 4-6 mpg drops. The Geniii likely wouldn't drop so far due to higher torque.
     
  19. GSW

    GSW PRIUS POWER

    Joined:
    Jul 7, 2009
    537
    74
    0
    Location:
    Jacksonville
    Vehicle:
    2010 Prius
    Model:
    II
    Really? The 17's ride better than the 15's?
     
  20. F8L

    F8L Protecting Habitat & AG Lands

    Joined:
    Aug 14, 2006
    19,011
    4,067
    50
    Location:
    Grass Valley, CA.
    Vehicle:
    Other Non-Hybrid
    Model:
    N/A
    Not in my experience. :)
     
Loading...