According to physics F=mu×N. With tires there has to be more that applies. To increase friction, you have to run a stickier rubber compound tire (mu) or increase downforce like with aerodynamic parts (N). But why is it that if you install a new set of tires that is the same coefficient of friction, and you don't change the normal force, but you do go to a wider tire size, how is it possible that a larger contact patch increases traction? There are many factors at play here, first and most importantly is that the tires must reach the optimal operating temperature to achieve maximum grip. There are also tire slip angles which is the angle at which the tire is in relation to the direction of travel of the wheel/rim (optimal slip angles seem to be around 6-10 degrees). Then we have the factor of a wider tire with a shorter sidewall being able to have better steering response and the wider surface area more efficient in evacuating heat, which also leads to longer life. There are other factors like suspension setups and the pressure per area of the contact patch, and not to mention a vehicles center of gravity and body roll. There is alot of other things like the way the tires deflect under lateral load, and people actually get better lap times just from changing wheel widths to better fit the tires so the sidewalls can deflect properly. If you gain traction by putting on a wider tire of the same compound, why does it seem to defy this simple rule? I have read through tire load sensitivity and I'm not sure it answers my question, or maybe I don't understand it fully, as I am not a genius. Hopefully someone has the answer.