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2012 Boss Wheel/tire config for 20" monoblock set up

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I am thinking of putting adv.1/HREs/Modulares/or Rennen 20s " (monobloc) on Brand New Boss
Looking for optimal width and tire sizes for front/rear.
Most Manufact are suggesting 20 x 9 front/20 x 11 rear. Some say go only 10.5. Also looking for a cost effective alternative to Pirellis. Car will be mostly for street.
Any Guidance would be most appreciated.


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