so mr. lik i think you are correct, the distortion of the tires basically cancels the positive effect of the increased footprint from the wider tires, resulting in no increase in cornering ability....
celeron_266 發表於 2011-7-11 23:55 
Minor correction here:
When you go with a wider tire on the same car, the contact patch doesn't necessarily increase in size. However, the shape of the contact patch will change. The thing to keep in mind is that the contact patch is dependent on both the tire size and just as importantly, the weight of the vehicle. In Celeron's case, the vehicle weight change is, for all practical purposes, negligible regardless of whether a 205/55/16 or 225/50/16 tire is used. Since the vehicle weight is the same, the pressure on the tire is the same. With a narrower tire, the contact patch is gonna be longer and skinner (narrower). With a wider tire, the contact patch is gonna be shorter but fatter (wider). So the shape of the contact patch changes, but it is not clear which contact patch has a larger overall area. What would happen though is, the narrower tire should actually have a better longitudinal acceleration (accelerating in a straight line) but poorer lateral acceleration (turning). The reverse would be true with a fatter tire.
Essentially, it's a tradeoff between longitudinal acceleration vs lateral acceleration.
-Lik |