Originally Posted by Cat 320D LRR
bigger drive system. The S series has 12cc pumps and the X has 16cc 2mph faster ground speed. Different tires as well. also bigger front casters. I compared the S and X series 60in deck models off of exmarks brochure
I don't think that's really an issue. I've taken the X out several times when my mower was in the shop, and it can move at speeds way too fast to mow.
Really nice machine, smooth, comfortable, but a 60 is too big for most of my properties.