Jim Coate wrote:
> 
> Steve Gaarder wrote:
> > > Steel on steel is the ultimate in low rolling resistance,
> > Does anyone know what the resistance actually is?
> 
> For a typical 20-inch train wheel, "the coefficient of rolling friction
> ranges from 0.0005 to 0.001".

...which is less than 1/10th that of a rubber tire.

-- 
Lee A. Hart                Ring the bells that still can ring
814 8th Ave. N.            Forget your perfect offering
Sartell, MN 56377 USA      There is a crack in everything
leeahart_at_earthlink.net  That's how the light gets in - Leonard Cohen

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