You can see what difference different sizes make here:
www.miata.net/garage/tirecalc.html
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FB,
Identical sizes on each axle is the golden rule, and preferably all the way round.
As has been said above, changing profile plus or minus a few per cent is probably neither here nor there, but it will, strictly, alter gearing/speedo.
Circumference is the key and Mr Pi and some O level maths can help you work it out.
Clearance is the other issue, for example, the 55s you mention would be OK parked, but could/might graunch the wheelarch under suspension compression - speedhumps, etc.
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It's a good idea to have the rolling radius of the wheels on driven axles as near identical as possible. Apparently Subarus are sensitive to any anomalies in rolling radius, one of their few over-sensitivities. But they used not to have a central differential. Whatever the car, different sized tyres on a driven axle will make the differential work all the time and wear it out.
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