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> Spare tire sizes, 15 x 5.5 - 68 911 Porsche wheel
emerygt350
post Jun 26 2026, 06:44 PM
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A friend gave me an ancient wheel to use as my spare. Currently it has a 165r15 Dunhill on it. The wheel is stamped 68 as well. Question to the community: is there a spare tire with near 24.9" diameter? Something like a 155/80R15 would match but I don't think they really seem to exist. Is there a way to find something like a space saver that would work on this? Anyone know a size that would work for me? The 185 is a bit big in the trunk too. Trying to use the free wheel.

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Cairo94507
post Jun 27 2026, 07:22 AM
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Have you tried TireRack.com? They may have all the dimensions for their tires posted. If not, their technical support side is pretty good when you call them. (IMG:style_emoticons/default/beerchug.gif)
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cgnj
post Jun 27 2026, 09:53 AM
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I have one of those. I only use it to wash my windshield. I will check what is mounted on it. I believe it is 165-80-15

Simpletire.com Is in Philadelphia and gives a veteran discount so I buy from them when I can. I would just shop price. They sell no name tires.
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mgphoto
post Jun 27 2026, 01:45 PM
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Not totally sure but I believe the steel wheels have a different lug surface, the alloy wheels use a different lug, than the steel wheels. I believe that the compact spare tire used on the 944 has a rim that uses the same profile lug as the alloys.
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73-914
post Jun 27 2026, 02:01 PM
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QUOTE(emerygt350 @ Jun 26 2026, 08:44 PM) *

A friend gave me an ancient wheel to use as my spare. Currently it has a 185rs15 Dunhill on it. The wheel is stamped 68 as well. Question to the community: is there a spare tire with near 24.9" diameter? Something like a 155/80R15 would match but I don't think they really seem to exist. Is there a way to find something like a space saver that would work on this? Anyone know a size that would work for me? The 185 is a bit big in the trunk too. Trying to use the free wheel.

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Looks like a 165 to me
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emerygt350
post Jun 27 2026, 02:37 PM
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Thanks for catching that, yeah 165, corrected the above.

I tried tire rack but did not find anything. Will keep digging.
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emerygt350
post Jun 27 2026, 05:37 PM
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What were the dimensions of the original spare?
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bkrantz
post Jun 27 2026, 07:45 PM
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Try Tire Rack. They list several tires for 165R-15. The cheapest is Vredestein, which is what I bought for my spare.
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bkrantz
post Jun 27 2026, 07:48 PM
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And try this site to calculate sizes, especially for matching diameters.

https://tiresize.com/calculator/
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Montreal914
post Jun 27 2026, 07:57 PM
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(IMG:style_emoticons/default/confused24.gif) Tire Rack has a couple of options for 155/80-15:

The nice one (IMG:style_emoticons/default/sunglasses.gif) : https://www.tirerack.com/tires/tires.jsp?ti...romCompare1=yes

The cost effective one (IMG:style_emoticons/default/smile.gif) : https://www.tirerack.com/tires/tires.jsp?ti...romCompare1=yes
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emerygt350
post Jun 28 2026, 05:14 AM
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Thanks! No clue why those were not coming up for me.

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Chad911sc
post Jun 28 2026, 07:23 AM
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Could just go with the same tire and rim you have on the car….
That way if you change out your flat tire, you’re still stylin’.


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emerygt350
post Jun 28 2026, 07:58 AM
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That would be nice but it would consume my whole frunk, and I daily this car. Groceries etc .. and I need to fit my rig in there for gigs.

Your pictures reminded me that I don't really know what the frunk is supposed to look like with a spare. Does the carpet/board piece go under? I guess I haven't noticed a hole for the fastener in mine.
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mate914
post Jun 28 2026, 08:25 AM
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QUOTE(emerygt350 @ Jun 28 2026, 09:58 AM) *

That would be nice but it would consume my whole frunk, and I daily this car. Groceries etc .. and I need to fit my rig in there for gigs.

Your pictures reminded me that I don't really know what the frunk is supposed to look like with a spare. Does the carpet/board piece go under? I guess I haven't noticed a hole for the fastener in mine.



"Does the carpet/board piece go under?" No, it sits on top of spare tire.

Matt
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73-914
post Jun 28 2026, 08:27 AM
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The board goes over the tire
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mepstein
post Jun 28 2026, 08:36 AM
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Note - if you run alloy wheels but use a steel spare, you need to carry shorter lug nuts for the spare. Otherwise, the longer lug nuts will bottom out on the rotor and not let the wheel rotate.
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emerygt350
post Jun 28 2026, 09:45 AM
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QUOTE(mepstein @ Jun 28 2026, 08:36 AM) *

Note - if you run alloy wheels but use a steel spare, you need to carry shorter lug nuts for the spare. Otherwise, the longer lug nuts will bottom out on the rotor and not let the wheel rotate.

I have five lug fuchs with nuts so not a worry for me.
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mlindner
post Jun 28 2026, 10:17 AM
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If your worried about space, go with a collapsable one like I did. BestAttached Image
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