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This is because you'll almost inevitably be going slower for any given distance into a headwind than in a tailwind, and therefore taking more time over it. Take a hill with an ascent and descent ...
"Naively, you may think that a strong tailwind can compensate for an uphill slope," said Bier. "You then ride up the hill as if it's a flat road, and on the way down the headwind and downward ...