Originally Posted by grezs
If you look at specs, you'll see the seat height on the SX is 4" higher. At 325 lb with arthritic knees, he'll want a higher seat. My wife is 59 with bad knees and she can get on and off her EZ-3 SX with no problem.
That may well be, but that's why I suggested letting him try both. I didn't have any trouble with the USX, it was the SX that I had trouble with. My knees aren't bad, I just kept banging them into the handlebars. My wife doesn't have knee problems either, it was just a matter of her legs being too short to get on and off the USX easily. I was too tall for the SX, and she was too short for the USX. I guess that's why they make both of them.