16” OEM to 15” Gen 3 OEM

Discussion in 'Gen 2 Prius Accessories & Modifications' started by Has Raf, Apr 18, 2025.

  1. Has Raf

    Has Raf Member

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    Would it be worth going from 16” OEM alloys to 15” Gen 3 OEM alloys, on my Gen 2? The goal is comfort, quieter ride and a bigger sidewall. Tyre prices are about the same for both tyres I’m looking at (205/60R16 and 205/65R15).

    Also, is it worth removing a 1.6” and reverting back to stock ride height, to achieve comfort and a quieter ride?
     
  2. MAX2

    MAX2 Senior Member

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    Are you sure you got the generations right?
    On Gen2 the tire size is 195/55R16 Europe, 185/65R15 USA
     
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  3. Has Raf

    Has Raf Member

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    I’ve got a lift kit on so, when I get new tyres, I’ll be getting larger ones compared to stock. I’m in the UK so my current tyres are 195/55R16.
     
  4. MAX2

    MAX2 Senior Member

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    Everything is correct now. 195/55R16 Europe

    Regardless of whether the car is raised or lowered, the distance inside the wheel arch remains the same, and when you insert a wheel (205/60R16) whose diameter is 32 mm larger, the wheel will start to touch the wheel arch.
    Use a tire calculator.
     
  5. Has Raf

    Has Raf Member

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    I have. See below. But my question is whether it’s worth buying smaller 15” alloys to improve ride quality and comfort.

    IMG_4490.jpeg IMG_4491.jpeg
     
  6. MAX2

    MAX2 Senior Member

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    You can see that they are different.
    If you decide to install 15 wheels, then the tires should be 185/65/R15.
    The ride will be softer.
     
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  7. Has Raf

    Has Raf Member

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    185/65R15 will be softer than 205/65R15? My question is, should I reduce from 16” alloys to 15”, or is it not worth buying new alloys? They’re about £200-300 here used for a full set of 4.
     
  8. MAX2

    MAX2 Senior Member

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    205/65R15 is a significantly larger tire than 185/65/R15 or 195/55/16.
    This size can get stuck in the Gen2 wheel arch.
    185/65/R15 will be softer than 195/55/16.
     
  9. Has Raf

    Has Raf Member

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    You’re not answering my initial question.
     
  10. dolj

    dolj Senior Member

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    The correct size in the UK for 15" wheels would be 195/60 R15, which is also what I run here. Use the calculator to find the correct wall height ratio for the 205 width.

    I can't really offer any perspective on 185 vs 195 vs 205 as I have only ever run the 195/60s.

    I use the stock 15" wheels for the Gen 2.

    I would think the ride comfort difference of 16" vs 15" would be pretty minimal, but I have no real data to support that.

    The greatest difference for ride comfort would be the actual tyre manufacturer, from my experience. I have had Goodyear, Firestone, Hankook, Bridgestone, and now currently running Michelin (Energy XM2+), and the only tyre that I even noticed a softer ride on was the current Michelin tyres.

    Tyre pressure makes a difference too; the higher the pressure, the harder the ride. I run the Michelins at 35 PSI front and 33 PSI on the rear as I have with all my tyres over the years.
     
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