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On models with no spare tire, what are folks doing?

Discussion in 'Gen 4 Prius Care, Maintenance and Troubleshooting' started by dpbsmith4, Apr 21, 2016.

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  1. Frederickdawg

    Frederickdawg Active Member

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    I don't understand why a spare donut for Toyota's I'm seeing are 16"? Thought they'd be 15?

    LG-H901 ?
     
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  2. Mendel Leisk

    Mendel Leisk Senior Member

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    More steel, less rubber?
     
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  3. JohnF

    JohnF Active Member

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    You should avoid northern Maine in the wintertime.
     
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  4. WilDavis

    WilDavis Senior Member

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    I'd be careful mixing different sized rims on the same axle, since doing so might confuse the car's computers and they'll start flagging ABS errors etc etc... (just sayin'...)

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  5. JohnF

    JohnF Active Member

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    If the circumference is identical to the other tires how would the computers know the rim size is different?
     
  6. WilDavis

    WilDavis Senior Member

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    ...well, God would know...

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  7. Mendel Leisk

    Mendel Leisk Senior Member

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    It can't be much of a factor: using the temp spare does that.
     
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  8. Frederickdawg

    Frederickdawg Active Member

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    The Toyota corolla space saver saver wheel unused on my local Craig's list is specified  T135/80R16.

    This will work right ? In gonna offer $50 for it. Keep it in my truck or wife's Prius just in case.

    LG-H901 ?
     
  9. Mendel Leisk

    Mendel Leisk Senior Member

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    That's the spec showing in my 2010 Prius Owner's Manual, should be good. I would take the plunge, get it, and then trial install, even drive up/down the driveway, just for giggles.
     
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  10. Frederickdawg

    Frederickdawg Active Member

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    Or use it for tire rotation purposes. Lol.

    LG-H901 ?
     
  11. JohnF

    JohnF Active Member

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    And measure its circumference and the circumference of one of your regular tires.
     
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  12. Mendel Leisk

    Mendel Leisk Senior Member

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    I think the temp spares are slightly smaller OD, say 1/4".
     
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  13. Frederickdawg

    Frederickdawg Active Member

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    The guy wouldn't entertain $50. So spent the money and ordered Carista instead LOL

    LG-H901 ?
     
  14. JohnF

    JohnF Active Member

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    Pretty simple to take the mounted and inflated tires and run a tape around them. Then you know for sure, and can easily figure the % difference if they are not the same.
     
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  15. Mendel Leisk

    Mendel Leisk Senior Member

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    I fed it into my spreadsheet some time back. Theoretical value, but should be close.

    upload_2016-5-3_7-42-59.png
     
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  16. JohnF

    JohnF Active Member

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    Agreed, but as a scientist I like to measure things to check theoretical calculations, especially when it's easy to do so.
     
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  17. Mendel Leisk

    Mendel Leisk Senior Member

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    You knew that was red flag to a bull, didn't you?

    Anyway, couldn't find a flexible fabric tape long enough, and regular steel tapes were kinking/protesting, so I ended up using a thickish nylon rope. The subjects were a 195/65R15 X-Ice with near-new tread, and my Prius temp spare 135/80D16. My wife helped position the rope, making sure it was on the crest and not slipping into a groove.

    Anyway, in both cases the rope measured 79.25". Now this is going around the centroid of the rope, outside of the tire OD, so a bit greater than the actual OD, but what shakes out is that they're the same, as near as I could measure.

    I also stacked one atop the other, on a concrete slab, pushed a square against one side and aligned them, then checked the other side: also aligned.

    image.jpeg
    (perspective at work here, they're actually near identical OD)

    Close up:

    image.jpeg
     
    #37 Mendel Leisk, May 3, 2016
    Last edited: May 3, 2016
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  18. ETP

    ETP 2021 Prime(Limit),Highlander HYB Plat,B52-D,G,F,H

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    Love paper maps BTW.
     
  19. bisco

    bisco cookie crumbler

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    they definitely have their place when it comes to the big picture.(y)
     
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  20. JohnF

    JohnF Active Member

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    Nice work! Isn't research fun? Your wife is a gem, but I suppose you knew that already.
     
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