Gastan

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I've been lurking often on Tacoma4g to pick up knowledge and answers that should apply to the 4Runner also. Here's helpful info about the largest spare tire (by diameter) that fits in the spare wheel / tire location in underbody.

285/70/R17 is the biggest spare tire size possible. This is essentially a 33" tire (32.71" to be exact).

From the owner:

I installed a full-size 285/70 r17 under the bed. It fits. The tires are wider but honestly I think it kinda looks badass with the bigger spare. It looks like it might impact my departure angle, but the tires are built to support the weight of the truck and they might even protect my trailer hitch a bit. Definitely it will get me home if I ever need it. Stock suspension and wheels, no mods to exhaust. Nitto Ridge Grapplers.

2025 Toyota 4runner Full-size spare tire: largest / biggest size (diameter) that fits 33" inch tire (33's) IMG_1093.JPG
2025 Toyota 4runner Full-size spare tire: largest / biggest size (diameter) that fits 33" inch tire (33's) IMG_1091.JPG
2025 Toyota 4runner Full-size spare tire: largest / biggest size (diameter) that fits 33" inch tire (33's) IMG_1090.JPG
2025 Toyota 4runner Full-size spare tire: largest / biggest size (diameter) that fits 33" inch tire (33's) IMG_1092.JPG




And here's another full size spare tire used that's not as wide as the one above.

255/75/R17 (32" spare tire)

From the owner (of a TRD Off-Road):

I did a tire swap at dealership at time of purchase. They gave me $500 for OEM tires.
I had them install Nokian Outpost nAT 255 75 R17 onto OEM wheels AND the spare wheel. Convenience spare was 245 75 so getting the new tire to fit on spare wheel wasn't an issue.
This tire size is a tad larger diameter than factory tire about 1/2"..also known as a true 32" whereas factory tires 265 70 17 measures closer to 31.5".
Image of spare. Sits close to tow hitch receiver level and well above rear diff.
Is ground clearance affected..i think a little yes but it sure is nice to have a proper full size spare that I can trust vs that convenience spare crapola.

2025 Toyota 4runner Full-size spare tire: largest / biggest size (diameter) that fits 33" inch tire (33's) 20240622_132016-

2025 Toyota 4runner Full-size spare tire: largest / biggest size (diameter) that fits 33" inch tire (33's) 20240622_131920-
 
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Gastan

Gastan

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Added another spare tire size -- 255/75/R17 (32") to first post above.
 

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I'd be concerned about departure angle as well. And I don't think the spare should be visible under there.
Having said that... I was behind a 4Runner the other day which had its spare tire mounted to an after-market swing-out system -- bumper-mounted I expect (after-marker bumper as well?). Which makes a lot of sense if you ever have a flat out in the wilds and can't access the underthing.
 
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This info is helpful regarding what's the maximum tire diameter that fits in the spare tire space in the undercarriage. I updated the title to clarify that.

What an acceptable width is (how much lower the spare tire hangs down compared to stock) is going to a subjective decision by each individual owner. This particular Tacoma owner (including others) is ok with it.
 

kekecarioca

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I've been lurking often on Tacoma4g to pick up knowledge and answers that should apply to the 4Runner also. Here's helpful info about the largest spare tire (by diameter) that fits in the spare wheel / tire location in underbody.

285/70/R17 is the biggest spare tire size possible. This is essentially a 33" tire (32.71" to be exact).

From the owner:

I installed a full-size 285/70 r17 under the bed. It fits. The tires are wider but honestly I think it kinda looks badass with the bigger spare. It looks like it might impact my departure angle, but the tires are built to support the weight of the truck and they might even protect my trailer hitch a bit. Definitely it will get me home if I ever need it. Stock suspension and wheels, no mods to exhaust. Nitto Ridge Grapplers.

IMG_1093.JPG
IMG_1091.JPG
IMG_1090.JPG
IMG_1092.JPG




And here's another full size spare tire used that's not as wide as the one above.

255/75/R17 (32" spare tire)

From the owner (of a TRD Off-Road):

I did a tire swap at dealership at time of purchase. They gave me $500 for OEM tires.
I had them install Nokian Outpost nAT 255 75 R17 onto OEM wheels AND the spare wheel. Convenience spare was 245 75 so getting the new tire to fit on spare wheel wasn't an issue.
This tire size is a tad larger diameter than factory tire about 1/2"..also known as a true 32" whereas factory tires 265 70 17 measures closer to 31.5".
Image of spare. Sits close to tow hitch receiver level and well above rear diff.
Is ground clearance affected..i think a little yes but it sure is nice to have a proper full size spare that I can trust vs that convenience spare crapola.

20240622_132016-jpg.jpg

20240622_131920-jpg.jpg
Thanks for posting this here. Taco info is inherently helpful to us here.
We were discussing 285/70/17 possible fit on the 4runner on another tread.
 

E.T.

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I've been lurking often on Tacoma4g to pick up knowledge and answers that should apply to the 4Runner also. Here's helpful info about the largest spare tire (by diameter) that fits in the spare wheel / tire location in underbody.

285/70/R17 is the biggest spare tire size possible. This is essentially a 33" tire (32.71" to be exact).

From the owner:

I installed a full-size 285/70 r17 under the bed. It fits. The tires are wider but honestly I think it kinda looks badass with the bigger spare. It looks like it might impact my departure angle, but the tires are built to support the weight of the truck and they might even protect my trailer hitch a bit. Definitely it will get me home if I ever need it. Stock suspension and wheels, no mods to exhaust. Nitto Ridge Grapplers.

IMG_1093.JPG
IMG_1091.JPG
IMG_1090.JPG
IMG_1092.JPG




And here's another full size spare tire used that's not as wide as the one above.

255/75/R17 (32" spare tire)

From the owner (of a TRD Off-Road):

I did a tire swap at dealership at time of purchase. They gave me $500 for OEM tires.
I had them install Nokian Outpost nAT 255 75 R17 onto OEM wheels AND the spare wheel. Convenience spare was 245 75 so getting the new tire to fit on spare wheel wasn't an issue.
This tire size is a tad larger diameter than factory tire about 1/2"..also known as a true 32" whereas factory tires 265 70 17 measures closer to 31.5".
Image of spare. Sits close to tow hitch receiver level and well above rear diff.
Is ground clearance affected..i think a little yes but it sure is nice to have a proper full size spare that I can trust vs that convenience spare crapola.

20240622_132016-jpg.jpg

20240622_131920-jpg.jpg
Was hoping to somehow magically fit 35's in the spare tire space below, but doesn't look like that's possible then.
 

ItsmeAlex

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Was hoping to somehow magically fit 35's in the spare tire space below, but doesn't look like that's possible then.
The biggest spare tire size I've seen anyone fit on the new Tacoma is 295/70/17 which is a 33.3" tire (and 11.6" width).

Here's that tire:

295/70 Yokohama Geolandar MT

2025 Toyota 4runner Full-size spare tire: largest / biggest size (diameter) that fits 33" inch tire (33's) img_1426-jpe


2025 Toyota 4runner Full-size spare tire: largest / biggest size (diameter) that fits 33" inch tire (33's) img_2032-jpe



Here's how low it hangs:

2025 Toyota 4runner Full-size spare tire: largest / biggest size (diameter) that fits 33" inch tire (33's) IMG_2031
 
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Gastan

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Bump. Helpful info for a question I'm seeing asked more often now.
 

nubbins_

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Excellent, sounds like a 265/70R18 or 265/70R17 would both fit then. Glad Toyota hasn't stooped to the level of actively preventing people from adding back features.

One thing that makes me curious though; on some other midsizers I've owned and driven, the exhaust and spare live in close proximity so some manufacturers include a heat shield for the tire. Does Toyota usually just not see a need for it?
 

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the question is though, do you have to be mindful of the right size 17 wheel to ensure you clear the calipers? correct offset and width of the wheel itself?
 
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