Bicycle tires. whole 'nother ballgame compared to car tires. Very narrow tires... very light... very high pressure.
This probably explains it nicely:
http://janheine.wordpress.com/2012/0...ance-of-tires/
Quote:
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Tires should not be tested without a rider on the bike. Most of the energy is lost in the rider, as vibrations cause friction in the body’s tissues (suspension losses). That is why testing in the lab can be misleading. In the lab, higher pressures roll significantly faster, but on the road, the suspension losses increase with higher pressures and cancel the advantage of the reduced tire deformation.
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