Originally Posted by
climber7
your bike won't vibrate and shake from lack of technique, at least not at that speed.
are your wheels true? is your headset/steerer tight? i don't really know what would cause vibration at only 24 mph, but i think it would have to be some kind of assembly/frame/wheel problem. otherwise, that's just weird.
Speed wobble can start around that speed, so it's possible it is related to technique.
Too much of your weight on the handlebars, plus a death grip will do it. Make sure your saddle position is correct, relax a bit, and if a wobble starts touch your knees to the top tube, which should stop it.