Donut size spare for Prius prime

Discussion in 'Prime Accessories and Modifications' started by Bluebells2, Apr 15, 2018.

  1. jerrymildred

    jerrymildred Senior Member

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    I have read the gen 3 & 4 are the same. Also that a gen 2 will work on later ones, but you'll probably get a code since it's a little different in diameter.
     
  2. Mendel Leisk

    Mendel Leisk Sidewalk Supervisor

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    Gen 2 temp spare rim might be the same though?
     
  3. jerrymildred

    jerrymildred Senior Member

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    Maybe. I'm about to head to an appointment soon, so I don't have time to look it up right now. I noticed that on a link earlier in this thread to a Toyota dealer's online store that they didn't spell out the size, just the sku number.
     
  4. DavidA

    DavidA Prius owner since July 2009

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    Lexus' CT200h's donut spare also fits exactly. My wife has that car, and on longer trips with the Prime we just place that in a big plastic bag and stow it behind one of the front seats. Strapping it down with ropes optional but suggested. We totally lucked out not having to find/buy one.
     
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  5. Mendel Leisk

    Mendel Leisk Sidewalk Supervisor

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    p/n for temp spare, that fits 2017 Prime: 42611-47631

    Wheel, Spare - Toyota (42611-47631) | Toyota Parts

    p/n for temp spare, that fits 2016 Prius: 42611-47631

    Wheel, Spare - Toyota (42611-47631) | Toyota Parts

    p/n for temp spare, that fits 2010 Prus: 42611-20841

    Spare Wheel - Toyota (42611-20841) | Toyota Parts

    p/n for temp spare, that fits 2008 Prus: 42611-20841 (same as 3rd gen)

    Spare Wheel - Toyota (42611-20841) | Toyota Parts

    So 2nd and third gen temp spare rims are the same part no., and Prime and 4th gen Prius also have same part no., different than 2nd/3rd gen. How different is maybe questionable?

    upload_2019-3-14_13-52-38.png
     
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  6. Rob43

    Rob43 Active Member

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    Since you already bought into that setup, go ahead and use it. Certainly if I or anyone on this forum were stuck on the side of the road, we'd bolt that 23.9" spare up & drive off.

    My thinking on fitment is two fold though, my first concern is the almost ~5% overall diameter difference between a 23.9" spare & the OE 25.0" tire. My second concern is equally as important, Spare Tire Load Capacity. A Prius Prime has a 195/65-15 OE tire with a Load Rating of 1356 lbs, this is the number we'll use as our bench mark. A 125/70-17 spare has a load rating of 1653 lbs at 60 psi & a 135/80-16 spare has a load rating of 1819 lbs at 60 psi. Like most of us you're thinking; This is great because both are higher / much higher than the OE tire, BUT...

    Not all of us are periodically checking our spare tire psi to make sure they're always at 60 psi, over time these tires are slowly deflating so now their load capacity is not what you'd think. In many cases it's easy for one of these unchecked spare tires to fall well below our OE 1356 lbs load rating bench mark. So when you take all of these factors in, right off the bat the 135/80-16 spare has a cushion of 166 lbs more load carrying capacity when compared to the 125/70-17 spare tire.


    Rob43
     
  7. Rob43

    Rob43 Active Member

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  8. Mendel Leisk

    Mendel Leisk Sidewalk Supervisor

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    Be careful: the size in that link is T125/80R17. Maybe that is for Prius v, which has a slightly larger OD (Outside Diameter) stock tire?

    The stock compact spare tire spec. for 3rd gen is: T135/80D16 101M

    (from 2010 Owner's Manual, page 735)

    An example:

    https://www.tirerack.com/tires/tires.jsp?tireMake=Yokohama&tireModel=Y870B&partnum=38MD6YOTEMP&vehicleSearch=false&fromCompare1=yes

    The stock compact spare tire spec. for 4th gen is: T125/70D17 98M

    (from 2016 Owner's Manual, page 566)

    An example:

    https://www.tirerack.com/tires/tires.jsp?tireMake=Yokohama&tireModel=Y870C&partnum=27MD7YOTEMP&vehicleSearch=false&fromCompare1=yes

    I think the above explains why there are different rim p/n's 3rd gen vs 4th, btw: while the tire OD is the same (or very close), and the rim bolt pattern, offset etcetera is the same, the rims are for different tires 16" vs 17". I'd suspect either 3rd or 4th gen spare would do.
     
    #28 Mendel Leisk, Mar 14, 2019
    Last edited: Mar 14, 2019
  9. Rob43

    Rob43 Active Member

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    A 125/80-17 is 24.9" overall diameter....

    Remember that the Primes OE 195/65-15 tire is 25.0" overall diameter.

    So a 125/80-17 is the best match up.


    Rob43
     
  10. Mendel Leisk

    Mendel Leisk Sidewalk Supervisor

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    You're right on all counts. Strange though: the Owner's Manuals say different.
     
  11. Rob43

    Rob43 Active Member

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    What I find even more interesting is:

    When you go to Tire Rack & look up 17" (Plus Two) tire sizes for the Prime, TR only lists the 215/45-17. They do not list the 225/45-17 option, or my overall favorite option; the 205/50-17*.


    Rob43


    * The tire size I personally run.
     
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  12. DonJ

    DonJ New Member

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    IMG_3375.JPG
    I went to a Toyota Dealer and looked at the 2019 Prius LE. It has a T125/70D17 98M spare on the 42611-47631 wheel. It has OE 195/65-15 tires that are 25.0" overall diameter. The owners manual for the 2019 Prius warns that the car 'may' ride lower after installation of the spare. Attached is a photo of the spare in the 2019 Prius LE.
     
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  13. Mendel Leisk

    Mendel Leisk Sidewalk Supervisor

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    I found this the other day, might be of interest:
     

    Attached Files:

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