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			Correct, 65mm offset will not fit the rear.  At least not without a 20mm spacer. 
 
I recently put Cayman S replicas on my car 18x8 front, 18x10 rear.  Front offsets are 50mm, rears are 47mm.  The rears fit, but clearance to the strut is tight -- probably 5mm at most.  I haven't experienced any rubbing, but I'm running 265/35... I think 275s would rub.  If you can find 10" rears with a 43mm offset, you would have enough room for wider tires. 
 
Good luck.
		 
		
		
		
		
		
		
			
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				-- John 
   '00 Boxster S 
   '86 911 Carrera Coupe (Sold)
			 
		
		
		
		
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