A56 said

What car?
Does it matter if the spare fits in the spare tire well?
If you go staggered I would want the spare the same size as the front. I personally would rather have the one size smaller tire (if you only go one size difference) on the rear if it went flat instead of a wider spare and having to put it on the front if that went flat.
Mine are 235x60/14 front 245x60/14 rear and my spare is a 235x60/14.

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