I'm fat. Lets just call a spade a spade here. I have to use the fatty seats on HULK, and Dueling Dragons. I have to squeeze into Dr. Doom and am somewhat cramped on the suess skytrolley. Everything else, I'm golden. Plenty of room for my fat butt. Basically it rolls like this, if you have no problems on stuff at disney you will no probs with stuff at Universal...except the coasters....but if I had to guess, you're going to stay away from the coasters....call it a hunch. If you dont, they will have a few seats that will accomodate most sized people.