speed wobble, death wobble, shimmy, whatever your term for it, it's possible on vehicles like bikes.
a multitude of contributing factors causes it, but only one thing needs to be changed to stop it on a bike.
Either A: clasp your knees against the top tube, or B: lift your butt off the saddle or change your speed drastically, which will change the harmonics of the bike and cause it to stop.
Last edited by AEO; 10-18-10 at 07:45 PM.