If you've made it to this blog, you're probably familiar with the friction circle. As a quick review, it’s the theoretical circle of forces that a tire can develop – 100% accelerating, 100% braking, or 100% cornering in either direction. The exciting part is as soon as you start using less than 100% of one direction, you can start using some of another direction. This idea is what gives us the friction circle. The actual friction circle that the car can achieve is shaped sort of like a heart without the divot in the top. Some Googling says the shape is real name for the shape is a curvilinear triangle. Who knew?