Originally Posted by
RubeRad
In other words, FB doesn't want to play...
My guess: somebody had a bike locked up at the rack, but got a ride home in a car. They took the front wheel off so the bike would fit in the trunk, and accidentally forgot and left the wheel behind.
That's my guess, much like the cups of coffee that are left on the roof before people drive off. Someone else must have found it and returned it to the rack.