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I just wheel my bike into class everyday, every time. I was stopped once at the science library, but the second I said "University policy states that it's-" the guy let me through saying that he didn't know most of these policies. You can always just pose the question to the transportation/parking office (since they usually handle the bike stuff) and ask if there is anything preventing you from bringing the folded bike in, and they're likely to tell you that there's nothing saying you can't. The bike probably only takes up a very small space in the corner of the room, so I don't think anyone is really going to care that much.