About a month back, I was going through some old issues of Bicycling magazines that I had laying around, looking for useful info before I finally tossed them in the trash. I ride a singlespeed road bike, which means I run out of top-end gearing faster than someone with the ultimate 55×11 gearing. As such, I find myself trying to get as low and aero as possible to make up speed when I can no longer accelerate through pedaling.
I’ve been trying this tuck position on some of the longer hills I ride, and I’ve noticed a huge difference in speed, especially on windy days–which we’ve had a lot of lately. I wouldn’t suggest it to everyone, since it puts a lot of stress on your elbows, and it moves your hands away from your brake levers, but for the occasional quarter-mile or longer downhill, where pedaling no longer does any good, it makes a difference.
(scanned from Bicycling Magazine, June 2002)