A guy posted this the "Phreds" Bicycle touring list today, He doesn't cite
the source, but I thought I'd post it here for chewing on.
<quote>
This was done by a physicist and is several years old. I cut and pasted
it into my cycling file. He studied cat 1 and cat 2 racers in actual race
conditions so they were probably on tubulars which have a little more
rolling resistance than clinchers and from what I remember there were many
hills:
Bicycle Drag losses:
60 % Rider Drag.
12 % Rolling Resistance.
10 % Wheel Drag of both kinds-this is aero drag both kinds spinning and
progression, rolling resistance is above.
8 % Bike drag includes entire bike and all components except for wheels.
8 % Inertia of all kinds including rolling inertia of wheels. The wheel
inertia is actually only about 1% of this overall figure and is almost
negligible.
2 % bearing friction and flex losses. etc.
<end-quote>
cheers,
-kt
--
Kingsley Turner,
http://MadDogsBreakfast.com/ABFAQ - news:aus.bicycle Frequenly Asked Questions