You all are absolutely correct...I should have, and meant to say wheel. Irregardless..... I keep my bike on my bike rack during work. I drove to our meeting spot for the ride and took my bike off the rack - didn't notice anything wrong. Then I picked up the bike to swing it around to head out of the parking lot and when I did the wheel came off. When I checked the quick release it was still closed but opened easily when I went to put the wheel back on. I put the wheel on and rode without incident. I was just wondering if they can loosen that much on their own or is it more likely that someone messed with the bike?