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Well, the bearings doesn't care much if it's a 120 lbs rider or a 180 lbs rider - their drag is very much the same. The tires can easily be inflated a bit more for the heavier rider, making rolling resistance pretty much the same too. What's left is air drag, and the clue here is that a rider that's 50% heavier won't have a 50% bigger frontal area. So the lighter rider will only have a tad less wind resistance but a much lesser weight dragging him downhill.

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14y ago
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10y ago

The less air there is in the tires, the softer they become. The softer they become, the more they squish and deform at the contact patch with the ground, the more they deform, the more energy is soaked up by the tire. And that energy comes out of the speed of the bicycle.

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13y ago

Because when you're riding downhill gravity is helping by pulling you down, but when you're riding uphill you have to overcome gravity - just as when you're walking up a set of stairs.

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Q: Why do we go down slower down a slope with less air pumped in a bicycle?
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