The standard training tool for cycling coaches for decades has been the stopwatch, a quaintly inconsistent barometer that could tell how fast a rider was completing a segment of work.
These days they're little more than a prop.
USA Cycling is pushing the limits of training technology in the run-up to the Rio Olympics, first with a revolutionary track bike that took years of design, then with proprietary hardware and software they can use to better gauge how well their athletes are training in the months leading up to the Summer Games.
"We are always looking for technologies to improve and push the limits of our athletes' performance," said Andy Sparks, director of the U.