Recommend Tire Size: Stock 20's

wouldnt 285/50 have a larger diameter vs 265/50 (stock), thus alter the actual speed on the odom?

Yes because the aspect ratio (The profile or height, 50 in this case) Is calculated off of a % of the tire's width. This is a big issue for Jeep, 4X4 owners when they lift their cars and put on giant mudders.
 
I have the 50, but they are run-flats. I'm hoping to get a 45 next, since my rears are about done, and I want to get non run-flats so it could end up softer.
 
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