Hey all, If this question isn't on topic, I guess just ignore it or send me your thoughts off list. O.K.- Can someone explain the mechanics/physics involved in high speed,hands-off shimy experienced in cycling? I assume the root cause is a slightly misaligned frame. But why does the front wheel "vibrate" back & forth rapidly instead of just veering off to the right or left? (on topic material- My '72 Paramount has a tendency to do this on steep descents when I take my hands off the bars, which I don't do too often.)Thanks,Greg Brooks, Ridgetop,TN.