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More than the size difference I would not use your friend's rear tires with your fronts unless they were all the same brand and model. Also your friend's tires should have a manufacturing date that is not more than 6 years old, the tires should not have any dry rot and should have a decent amount of tread left. Hopefully someone else will advise you on the size difference.
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Current: 2022 718 Cayman GT4, PDK bone stock (the dark side).
Former: 2003 S, 3.6 LN Nickies, ARP rod bolts, under-drive pulley, Fabspeed sport headers, Softronic tune, 987 airbox 987 motor mount, Function-First Sport motor mount insert, Ben's short shifter, Nine8Six projector headlights & center caps, ROW M030, stainless flexible brake lines, B-K rollbar extension & fire extinguisher mount, hardtop
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