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15" tire sizes

Wheels and Tires

Model: 911, Year:1977, Mileage:123000, Type of use:Street use only
I currently have 15x6 Fuchs with 215/60 front and rear tires. The rear tires could go wider with no rubbing issues. (stock height on suspension)I was looking at other size tires on an online tire calculator. If the diameter of the original size (195/65) is greater than 3%, they say it may cause braker failure. what's your thoughts on this? I would like to go wider on the rear, like 225's. What do you recommend, and can I use a different size on the front?

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