Quoth Ken Wehrenberg:
>Steven Maasland opined, "They aren't much use if any under 20
>mph...", but later he said that the fairings "protect your privates
>and hands in very cold weather". That is precisely when I would use
>my fairings (I have 2). Sort of like putting the windscreen on the
>tractor to plow the lane of snow, I guess. Reduces self-inflicted
>windchill factors on the bikes.
I had mine on my Rambouillet fixed-gear coming to work this morning, and I would have been sorry to be wearing fingerless gloves if I didn't have it!
In my experience, the Zzipper actually _reduces_ my maximum downhill speed, because it prevents me from getting into a good aero tuck...my head bumps into it first.
They are, indeed, great in cold weather. I figure it's worth about 10 degrees fahrenheit.
They are still in production, apparently...Google reveals:
Sheldon "Bubble Boy" Brown
+--------------------------------------------------+
| If you find yourself standing to accelerate, |
| on level ground, it is a sign that your gear |
| is too high, or that your saddle is too low. |
| See: http://sheldonbrown.com/
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