luckily i have had two HUGE dorm rooms the past two years so i could keep both bikes in my room without a problem. i think your best bet would be the rack that people are suggesting. i probably need to get one for this year though. another thing you could look into to optimize space is lofting your bed in your dorm. they let us do that at my school. you could then push dressers and your desk under there to get crap out of the way or just park your bikes under the bed. you might be able to devise something that would hold your bike on the lofted bed too on the end. getting some hooks or something that hold onto the frame.