60mph on a single bike, 62mph on a Tandem.
Both were in races, so there was at least some potential reward for the risk. Outside of a race, I usually keep it under 50mph these days.
Ironically, the older you get, the more you're consciuos of your own mortality.
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You could fall off a cliff and die.
You could get lost and die.
You could hit a tree and die.
OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.