Minimum heights vary from ride-to-ride, but it seems that 42" is plenty for most, and 48" should get you on just about any others.
48 inches on most Batman and superman rollercoasters ..
If you're over 6 ft. tall, you may also have issues. Some rides, depending on the restraint system, you may not be able fit\ride. I'm 6' 2" and had issues with a few.
48in
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