Whats the difference between 111s and 111t tire sizes?

Im trying to price some tires and want to know what the difference is with 111s and size is 265/70/16 111s and 11t....but what is the difference.


its just the speed rating, i think S is up to 112 mph and T is up to 118mph..

I know that the 265 is for the tire width in millimeters, and the 70 is the aspect ratio, the sidewall is 70% as tall as the tire is wide. Usually after the 70 there will be a R or something which means radial tire, and the 16 is the rim size