If the spare physically fits, you need to verify rev/mile. Do not use just the diameter of the tires. Other things come into play such as air pressure, car weight. Look up the rev's for each different tire from the manufacture. Ratio of 1:1 rev/mile is best, if not try to stay within in 1%-2% of other tires. You can always "trick" a tire into being smaller by decreasing the air pressure a little.
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