Twenty Years Ago
4-9-87 . . . There are two main external variables in bicycling: wind and hills. Imagine a closed circuit. Other things being equal, one’s average speed decreases as the wind velocity increases. I once thought that any disadvantage caused by headwinds was offset by the advantage gained by tailwinds; but this is false. One never gains as much with a tailwind as one loses with a headwind. So the best speed will be attained on a windless day. The same goes for hills. One never gains as much coming down a hill as one loses going up. So the ideal conditions are a flat, closed loop with no wind. Deviations from this ideal, other things being equal, lower one’s average speed. From here on out, I’m going to limit myself to closed loops. That is, I’ll make sure that I start and stop the odometer at precisely the same spot. I’ve always done this on my [Colossal] cave rides, but sometimes not on other rides. Since wind and hills are out of my control, there will be days when my gross-average speed is better. But that’s fine, because I like diversity. The records will come when wind is low and my route has few hills.