Joined: Nov 2005
Posts: 5,768
Likes: 10
Bikes: Cinelli, Paramount, Raleigh, Carlton, Zeus, Gemniani, Frejus, Legnano, Pinarello, Falcon
Grab the wheel at the top and see if it moves side to side: could be a loose hub. Squeeze a few pair of parallel spokes: should be pretty firm.