Old 12-04-08, 01:12 AM
  #93  
waterrockets 
Making a kilometer blurry
 
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I think it has to do with the inertial differences between the road and the trainer. If you stop pedaling on the trainer, it doesn't take long to come to a complete stop. On the road, it takes a really long time. So, on the trainer, the dead part of your stroke (with reduced power) is going to decelerate more than on the road.

This means that you're spending energy accelerating the wheel more with each pedal stroke, which means that your normal applied torque will be multiplied by a lower angular velocity on the crank or the wheel, until you get back up to speed during the stroke. Lower angular velocity means less power.
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