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Originally Posted by paul21

I believe that's the case. However the rear brakes are much smaller from what I can tell, so I skipped the spacer and plan to rotate if the spare is needed on the front. It's probably safer that way anyway since emergency braking relies on the front tires more heavily.

It’s safer to have the spare in the front.
If you put a donut on the back, you can easily spin. I don’t recommend doing it at all.