Car tires perform best when they are evenly loaded. Wider tires and even 50/50 weight distributions help allow for even pressure among the tires, allowing for better grip. As load increases on a tire, the coefficient of friction between the tire and the road decreases, thus the amount of lateral grip the tire has decreases. This video helps to explain why, which is a result of the viscoelastic properties of the rubber used in the tires. As the polymer chains which make up the tire stretch out, they become less resistant to additional strain.
Traction Circle - http://youtu.be/JjCcFsGLpaM
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