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					Originally Posted by thstone
					
				 +1 on reducing weight and unsprung mass to mitigate the loading from a 18" setup. 
 Key would be to ensure that the 18" tire/wheel combo had the same or less weight, along with same diameter/circumference, as the 17" setup.
 
 If these conditions are met, the suspension should be loaded similarly between the 17" and 18" setups.
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I believe the main concern was increased torsion load from the reduced sidewall height & presumably higher performance tires.