The height requirement depends on the ride, but having worked at Disneyland for the past 3 years, the tallest a rider has to be, I've noticed, is 54 inches.
It's different height for all the rides
you have to be 54inches tall
It depends on what ride it is. You can go to sixflags.com for how tall you have to be for all the rides in any six flags amusement parks.
at least about 45' if you wanna know exactly go on www.sixflags.com .. click on rides and it will tell you EVERYTHING about it... even the height
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