I am 6'2" 315lbs. I don't have any problems at disney, space mountain is awkward to get into but not really tight. Universal can get a little worse, at the studios you should be fine, at Islands of Adventure you will be fine on the normal rides and the coasters have seats that are slightly larger in some of the rows, just request it when you are in line. They also have trial seats at the ride entrance to check if you fit before you wait. The only one I don't ussually go on is Doctor Doom at IOA, the seats are a little tight at best and for that type of ride I don't feel safe enough. hope that helps.