Most folks give up the extra comfort and rim protection of the taller sidewall of the 17" for sharper turn in, harsher ride and greater possibility of pinched sidewalls/bent rims of the 18". (actually sharper handling, the rest is just a bonus) 
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2013 991.1 Carrera S Cab
2004 996 Turbo CAB X50 sold
2003 996 cab 6 speed Sold
1972 RS 3.2 twin plug short stroke crank fire, roll bar, sold
DE instructor since 1985
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