1. Attachments are working again! Check out this thread for more details and to report any other bugs.

I know 195/65 R15 is the Prius standard size for the 15" rims on my 2017

Discussion in 'Gen 4 Prius Main Forum' started by TinyTim, Nov 28, 2023.

  1. TinyTim

    TinyTim Active Member

    Joined:
    Nov 23, 2016
    365
    222
    0
    Location:
    Seattle
    Vehicle:
    2017 Prius
    Model:
    Two
    Can I put 185/65 R15's on my 2017 Prius? I got a good deal on the 185's and if they ship, I want to put them on my Prius. They are Yokohoma tires. I know that 185 and 195 are interchangeable on the 15" wheel. Usually people go from 185 to 195 and not the other way.

    I had a Honda Civic that was 185 and could put 195 tires on it as well. Something about the tire axis being the same and minimal speed difference on the speedometer.
     
  2. JC91006

    JC91006 Senior Member

    Joined:
    Nov 10, 2013
    16,446
    8,374
    0
    Location:
    Los Angeles, CA
    Vehicle:
    2008 Prius
    Model:
    II
    How much money are you saving by doing the switch? It may cost more to install and ship than anything else
     
  3. TinyTim

    TinyTim Active Member

    Joined:
    Nov 23, 2016
    365
    222
    0
    Location:
    Seattle
    Vehicle:
    2017 Prius
    Model:
    Two
    Free shipping and less than $40 per tire. I don't want to say how much until it ships but even lower.
     
  4. Mendel Leisk

    Mendel Leisk Patron saint of newly poured sidewalks

    Joined:
    Oct 17, 2010
    54,125
    37,922
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    You've theoretically reduced the tire radius by 6.5 mm (~1/4"). You'll need to rev higher to maintain any particular speed. Your odometer will be off. And less ground clearance.

    upload_2023-11-28_9-6-4.png

    I'd stick with stock size, just opens a can of worms.
     
  5. Mendel Leisk

    Mendel Leisk Patron saint of newly poured sidewalks

    Joined:
    Oct 17, 2010
    54,125
    37,922
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    It's weird: in OP's lists of threads he's started, there's three near-identical threads showing, to this one, and none of them have responses. And this thread, with responses, is not showing.
     
  6. JC91006

    JC91006 Senior Member

    Joined:
    Nov 10, 2013
    16,446
    8,374
    0
    Location:
    Los Angeles, CA
    Vehicle:
    2008 Prius
    Model:
    II
    "this site is migrating to a server this week", safe to assuming this stuff is going to happen for the next half a year
     
    Mendel Leisk likes this.
  7. TinyTim

    TinyTim Active Member

    Joined:
    Nov 23, 2016
    365
    222
    0
    Location:
    Seattle
    Vehicle:
    2017 Prius
    Model:
    Two
    The prius chat server was laggy/hanging and it posted two or three times.
     
    Mendel Leisk likes this.
  8. ttou68

    ttou68 Active Member

    Joined:
    Sep 9, 2017
    341
    198
    0
    Location:
    40509
    Vehicle:
    2010 Prius
    Model:
    III
    I just received mine for a 2005 Prius, so good chance you'll get yours soon.
    Posted via the PriusChat mobile app.
     
  9. jdenenberg

    jdenenberg EE Professor

    Joined:
    Nov 21, 2005
    3,818
    1,822
    1
    Location:
    Trumbull, CT
    Vehicle:
    2020 Prius
    Model:
    LE AWD-e
    Your speedometer and odometer will regiter a couple % faster/higher and check the tire load rating to make certain that they will not be stressed.

    JeffD
     
  10. Mendel Leisk

    Mendel Leisk Patron saint of newly poured sidewalks

    Joined:
    Oct 17, 2010
    54,125
    37,922
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    You're not alone, it's been hard to avoid double posting for close to 2 months now. I "reported" my post above, and tideland will likely sort it out.

    BTW, going fine this morning, maybe out of the woods...
     
  11. Mendel Leisk

    Mendel Leisk Patron saint of newly poured sidewalks

    Joined:
    Oct 17, 2010
    54,125
    37,922
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
  12. BiomedO1

    BiomedO1 Senior Member

    Joined:
    Mar 27, 2021
    1,214
    662
    0
    Location:
    SacTown, Ca
    Vehicle:
    2021 Prius Prime
    Model:
    LE
    going down a size means your going to lose another mile per hour. ie my speedometer is fast by 2 mph, when compared to my GPS on a flat straight drive across the valley floor. Measured over a 20 mile stretch of highway. My speedometer reads 70 mph, but GPS states that I'm only traveling at 68 mph. If I was to put 185/65r15 on the car, my actual speed will be 67 mph.

    I've gone online and found if I move to a 205/65r15, I should be able to narrow the gap to 69.2 mph actual.

    Tire Size Comparison
     
  13. Drakxyfly

    Drakxyfly Junior Member

    Joined:
    Sep 18, 2023
    109
    22
    0
    Location:
    Usa
    Vehicle:
    2021 Prius
    Model:
    LE
    Forgetting about the very minor mpg savings and speedometer let's talk safety. The 4th gen Prius weighs about 3050lb and it's riding on tiny little tires that can barely support itself. You can barely turn the corner sharply without the tires squealing in protest. Imo it's simply not safe and the vehicle needs more tire to support it's weight. This is why people go up to a 205, because a wider tire makes the car more stable and has more grip.
    Simply put the stock 15" tires, and probably in general a 15" tire, simply isn't sufficient for the weight of the car. The car has the same mpg ratings with the 17" wheels from what I found so what's the point in going to a less stable tire?
     
  14. jdenenberg

    jdenenberg EE Professor

    Joined:
    Nov 21, 2005
    3,818
    1,822
    1
    Location:
    Trumbull, CT
    Vehicle:
    2020 Prius
    Model:
    LE AWD-e
    Two things about tire load. first when buying new tires check the load rating of the tire (its on the tire sidewall) and make sure that the new tires have the same or greater rating than the OE tires. If your tire squeal on turns, your air pressure is too low.

    JeffD
     
  15. Drakxyfly

    Drakxyfly Junior Member

    Joined:
    Sep 18, 2023
    109
    22
    0
    Location:
    Usa
    Vehicle:
    2021 Prius
    Model:
    LE
    Again the tires squeal even when properly inflated, or 2-3psi higher because that's where I run them, because it's not enough tire for the vehicle and they break traction very easily. Even easier after I upgraded the suspension, but even stock it was not hard at all when taking any corner slightly aggressive. They simply can't handle any type of sporty driving..
    The first thing to do when buying any car, not just new tires is to ignore the psi recommendation in the door jamb from the car manufacturers and look at the max psi on the tire.
     
  16. Mendel Leisk

    Mendel Leisk Patron saint of newly poured sidewalks

    Joined:
    Oct 17, 2010
    54,125
    37,922
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    Our stock tires are 215/45R17, and through winter we use 195/65R15 snow tires. Stay close to Toyota recommended inflation. Not hearing noises on turns. Mpg better with 15” snows.