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My OEM wheels on My 2018 Cayman GTS are 20 x 8 (Front) 20 X 10 Rear. What would be the Concern if I put 20 X 9 Front & Rear.
Thanks!
The concern would be that the fronts are too wide and the rears are too narrow, upsetting the handling balance of the car. If you increase front width, you should also increase rear width.