Extra spare tire size

[tee-bone]

This might be a stupid question but I want to make sure I am being safe. I ordered an extra spare tire for our fifth wheel and accidentally ordered a 235 / 80r16 instead of a 85r16. I guess the question is can I safely use it since it's just for temporary use, or ship back and get the right size? Thanks

[Stan&Sharon]

The second number is aspect ratio
The bigger the aspect ratio, the higher/taller the tire’s sidewall, or “profile” as it’s sometimes called.
The aspect ratio is indicated on the tire sidewall as a percentage. It’s the height of the sidewall measured from wheel rim to top of the tread, expressed as a percentage of tire width.
If the aspect ratio is 85, meaning the sidewall is 85 percent as high as the tire is wide.
If all other numbers are the same, the tires look alike beside each other... Except the percentage of the side of the tire is sidewall.
To answer your question, is it okay for a temporary spare, yeah I wouldn't worry about it.

[billcf7]

Your tire will be 30.8" in dia. and the original is 31.7 Here is the link I use
https://tiresize.com/comparison/