The physics of taking turns

Cornering on the racing bike involves three objectives:
bochten natuurkundig• Handling the centrifugal force
• Control and carrying as much speed as possible at the exit
• Make quick adjustments

In this, the following factors play a role:
• bank angle with respect to the road surface.
• your body’s center of gravity (BCG) in the horizontal plane, just above or far away from the point of contact of the wheels with the road surface.
• The height of your BCG relative to the road surface.

For a curve with radius (r) and bicycle speed (v), the bank angle (theta) of the fixed center of gravity is given by: theta = arctan (v ^ 2 / g). Given this inclination, you can freely vary the relative position of the bike and rider.

You can make quick corrections on your line by playing with the position of your body. This can be done by pushing your knee into the turn. You can also make small adjustments quickly by buckling to a greater or lesser extend with the ski-turn. In the video about Cancellara you can see this clearly.
If you ride a curve with the ski-trun you can make minor corrections faster than with the classic turn.

By the kinks in the skihouding less mass goes sharply through the bend, but a part of it takes a wider curve. Thus, you need to compensate less centrifugal force.

To lean out with your upper body, you get more perpendicular pressure on the front wheel and therefore more control. This can compensate for the horizontal force to the outside as a result of the centrifugal forces. This reduces the chance of slipping. This enhances the effect of pressing down the outside of pedal.

When entering a curve you use consciously or unconsciously ‘to sweep’, ie first to send before you “fall” to the desired side. See Curve Work