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Old 04-22-10, 12:19 AM
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Sixty Fiver
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It is because going slow probably causes you to pedal at a lower cadence and move into the anaerobic range which will fatigue you more than when you can spend most of your ride working at peak aerobic capacity.

You are basically lugging the engine when it wants to be revved up.

Try gearing down and working at a higher cadence, even if you are going slower.
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