Reset Help Getting on a so-called "tall bike" is harder than mounting a regular bike. But once a rider is in place, it is easier to balance on the tall bike, and the bike can be I = myh safely ridden at very slow speeds. (Figure 1) If we call the angle the bike makes with the vertical @, the gravitational torque on the rider of mass m be much easier T = mgh cos(8) . where h is the height of the bike. linearly The moment of inertia of any part of the mass of the rider is I = mi T = mgh cos(@) So, the torque depends | linearly on the height, while the moment of inertia does quadratically Figure (