Originally Posted by **********

I didn't say it was easy, I said they are doing it wrong (obviously, since they were failing).

Gravity wants to push the bike down the hill. We already know the force of gravity, The riders should already know the slope of the hill (60 deg?) and the weight of their bikes + their own weight. They should also know the center of mass of themselves + their bikes at rest, and their combined center of mass at a 60 deg angle.

With zero unknowns, A math-alete should be able to tell the rider exactly what to do to make it to the top of the hill.