Winter Riding

Ken Roberts wrote:
Assuming a coefficient of static friction of around 0.6, and a
air-resistance coefficient of 0.172 for a rider and clothing and bicycle
weighing a total of about 80kg (175lb), and assuming 70% of the weight is
supported by the rear wheel, I get a
maximum speed around 156 km/hr (97 mph)....

Is the Cd of 0.172 realistic? I have seen values quoted from Cd=0.4 for
an upright TT cyclist to Cd=0.9 for a rider on a upright "city" bike.

The calculated Cd for the Varna Diablo [1] is in the range of about 0.06
to 0.08.

[1] http://www.varnahandcycles.com/gallery/varna_diablo_01.jpg.

--
Tom Sherman - Holstein-Friesland Bovinia
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