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Old Sep 1, 2021 | 10:07 AM
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Default Spare Tire

Hello,i just got new tires on my 1980 c3 ,245/60r15 100t,i would like to know what size tire i can use as a spare that will fit in my spare tire carrier, thank you.
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Old Sep 1, 2021 | 10:14 AM
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You will need the spare from a Chevy S-10, current modern size tires will not fit in the tub. That statement is true for a C2, I'm assuming the C3 is the same.
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Old Sep 1, 2021 | 11:02 AM
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In 80 you have a space saver rim with an original tire 195/80/15 which has a tire height of 27.28. The 245/60/15 measures in at 26.6

So you want a modern tire that comes close to the height.

205/75/15= 27.11
215/70/15= 26.9

I bought a 205 at Walmart to replace the spare. @$70. It will work to get you home & fits in the tub with the space saver rim.

Last edited by BKarol; Sep 1, 2021 at 11:20 AM.
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Old Sep 1, 2021 | 11:37 AM
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Default Mr ​​​​​​​Karol with a bullet!

Originally Posted by BKarol
In 80 you have a space saver rim with an original tire 195/80/15 which has a tire height of 27.28. The 245/60/15 measures in at 26.6

So you want a modern tire that comes close to the height.

205/75/15= 27.11
215/70/15= 26.9

I bought a 205 at Walmart to replace the spare. @$70. It will work to get you home & fits in the tub with the space saver rim.
I too, did the calcs and have a 205/75/15 they fit well into the spare tire carrier.

https://www.discounttire.com/learn/tire-size-calculator

Current:/Section
Width
RAspect
Ratio
Wheel
Diameter
SHOP 255/60 R15 TIRESNew:/Section
Width
RAspect
Ratio
Wheel
Diameter
SHOP 205/75 R15 TIRES
Current New Difference Sidewall Height: 6.02'' 6.05'' 0.03'' Section Width: 10.04'' 8.07'' -1.97'' Tire Height: 27.04'' 27.1'' 0.06'' Tire Circum: 84.95'' 85.14'' 0.19'' Rev. / Mile: 745.85 744.19 -1.66

Unkahal.

Last edited by L-46man; Sep 1, 2021 at 11:38 AM.
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Old Sep 1, 2021 | 01:39 PM
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thank you all for your kind replys.
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Old Sep 7, 2021 | 02:16 PM
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I just went through this with my ‘81. I dropped the spare tire tub and the original unused spare was still there.

I had it removed from the steel rim and I cleaned and painted it. I had a 205/75R 15 mounted onto it. It fit into the tub with no problem.
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