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Old June 29th 06, 08:17 PM posted to rec.bicycles.tech
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Default Bumps and efficiency

Yes, most definitely. For the same reason that knobby tires are less
efficient than smooth ones (on pavement, anyways).

On a bumpy road, part of your energy output is used to overcome the
bumps, leain less for propelling you forwards. Therefore you have to put
out more energy to accomplish the same amount of horizontal movement.

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