# Why do people recommend wider tyres in car for better road grip?

Tyre companies boast of their wider tires for better grip on road. Also, the F1 cars have broad tires for better grip. But as far as I know Friction does not depend on the surface area of contact between the materials. Even the formula says so.. $F=\mu mg$ (where $F$ = Force of friction, $\mu$ = coefficient of friction, $m$ = mass, $g$ = gravity)

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"But as far as I know Friction does not depend on the surface area of contact between the materials." This is true in physics 101 and is how we teach it, but it breaks down when there is non-trivial deformation of either material. Tires are well known as a "everyday situation" where this rule is not a good guide. I believe we have some users who know this matter in detail and they may give you a good answer. – dmckee Jun 11 '12 at 13:38
A simplistic answer is to consider the finite material strength of the rubber/tarmac. The larger the contact area, the greater the amount of bonds available to absorb the force before tearing. – Nic Jun 11 '12 at 13:43