Most of the porta potties in our local park have been changed over to the handicap ones, so my bike fits inside. On the rare occasion I'm at the other park with the little one, I pull half the bike in with me. Ours do have 2 (maybe 4?) metal D-rings on each side of the outside of the potty though that would be good for locking a bike for a minute or so...I suppose they don't all have those though (?).