Originally Posted by skierman64
There shouldn't be a difference between 18s, 19s, and 20s on ride height assuming the proper size tires are being used.
Your right, there shouldn't be a difference if the tire dimensions stay the same. (regardless of the wheel diameter)
BUT, here's the problem...
There are 'fitment gaps' in the tire sizing charts between 18", 19" and 20" tires. It's impossible to line these tire dimensions up perfectly, as you increase wheel diameters and widths beyond the stock OE sizes.
Everything gets out of wack, and you end up somewhere in between two tire sizes that you don't really want. At that point, you have to choose the more aggressive tire size (which may rub), or the more conservative tire size (which will transmit more NHV to the cabin).
And to make matters worse...the tire with the exact dimensions you want...is simply too wide (or narrow) for the wheel you bought.