What's a Decreasing Radius Turn?

Decreasing-radius turns are among the most challenging corners in motorsport. As the name suggests, decreasing-radius turns occur when a corner tightens as you go through it, so you end up having to turn more as you approach the apex.

What is an increasing radius curve?

An increasing-radius corner is one in which the bend gets less sharp the further into it you ride. In this type of corner, you can start rolling on the throttle much earlier because the corner is getting straighter. A decreasing-radius corner, then, would be one in which the corner gets sharper as you progress into it.

Why do motorcyclists lean into a corner?

When a motorbike enters a corner, friction generates a turning or centripetal force. That force generates a torque around the bike's center of gravity, which tips the bike out of the curve as you move forward. To stop the bike from tipping over, you need to lean into the curve.