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Wheels and Tires

Model: 911 C4S, Year:2004, Mileage:25,000, Type of use:Both Street & Track
I have a 2004C4S and received a set of 993 wheels with Pilot Sport Cup tires on them. The fronts are 8x18 with a 52 offset and the rears are 10x18 with a 65 offset. The tires are 225/40-18 and 285/30-18. I would switch them to my regular wheels except the rears can't be run on a 11" rim.The C4S wheels are 8x18 with a 50 offset and 11x18 with a 45 offset. I would assume the fronts are ok to run as is but do I need a 20mm spacer to run the rears?Thanks.

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