Tire Tread Width vs. P(num)?
I know that the first number of a metric radial tire is the width of the tire at the sidewall. For example a P195/65R is 195 millimeters wide at the sidewall. Also the tire sidewall height is 65% of 195 millimeters. This tire is a "low profile" sporty tire, and I have a set on one vehicle. The tires look very wide (and are a bit noisy).
I also have P205/75R on another vehicle. Now I would assume the tread width of the P205 tire would be wider than the tread width of the P195 tire, it isn't. It must be that the "low profile" fire has straighter sidewalls, and the tread has a more squared off transition to the sidewall than does the taller 75% tire.
Could this be correct or is there something wrong with my measuring, and my eye for that matter. It is the fact the 195 tire looked wider that caused me to measure.