I can regularly out-coast me riding partners. My bike is titanium, but about the same weight as my friends' bikes. There's no explaining it except for one thing - my Ultegra rim brakes don't have any drag at all. My friends' fancy bikes all have discs. I suspect that even a small, almost undetectable disc drag might be enough to account for what is a pretty significant difference at the end of a moderate 1/2 mile downhill.
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