I'm not A.D., he's on vacation, but I'll speak on the issue since I work with him. If you've noticed we all park on the sidewalk, but we also all take our license plates off. If they can't find a plate or a VIN they really can't write you a ticket. As long as you could have legally been parked on the street at the time I would say your plan is worth a shot. You just have to be convincing with your story. Tell 'em it's an old bike with no steering lock and someone just rolled it up on the sidewalk for the spot. The meter maids will right you a ticket for anything, anywhere on the sidewalk if they can find some numbers to record.
-Gardner
-Gardner