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There's no reason to keep the front and rear diameters close. I don't see any advantage to the taller 45 series tire in the front (and the potential disadvantage of clearance issues and the taller sidewall having more flex/less stiffness). I would vote for the 245/40.
I ran 275/40-17s and 245/45-16s (24.68" diameter) for years...
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Mike
1976 Euro 911
3.2 w/10.3 compression & SSIs
22/29 torsions, 22/22 adjustable sways, Carrera brakes
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