Originally Posted by
Bicycle365
No , they are silent for all intents and purposes.
<insert tangent here>
.........As far as the harmonic being translated to the bike through the fork, I think its possible but not probable as the amplification would have to be massive given the small input amplitude and the fact that it would be hard to hold speed precisely at that "magic number" to keep frequency stable long enough for it to develop.
</end tangent>
I sure think I experienced a bit of mechanical resonance on my setup, I was coasting down a smallish hill and was going over a rough patch of pavement, not bad just rough the front fork started to get a shimmy that steadily increased until I tapped the brake a couple of times then everything smoothed out. The shimmy started on the rough patch and continued for another 30 yards or so on smooth concrete so I'm pretty sure I wasn't confusing vibrations due to the rough concrete with mechanical resonance. This happened over a stretch of 50 yards or so. Improbable, yes, but definitely possible.