Thread: Tires

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I need some help about the numbers/letters on the tires. I used to know what they all meant but totally forgot because it's been a while since I had to deal with this kind of stuff (auto tech shop).
What's each number and letter and all mean on a tire? If anyone can just give me info and all on this then that would be great. I am not going to be buying any tires or nothing soon but I am just wondering again because this is on my mind for some reason.
Thanks for any help.

R= Radial
3 digit # is tire width in millimeters.such as 195 or 225 etc
T, S, V, H, etc is tire speed rating( how fast a tire has tested to and still rated as safe)
75, 65,60, 55, 50 40, 30 etc is tire aspect ratio. the comparison of tire width to tire side wall. it is a percentage, such as 50%, 60% etc. The lower the # the wider the tire in respect to wall height.
14, 15, 16, 17, 18, 19, 20, 22 etc is wheel diameter (measured at bead seat, not at very edge of wheel.
there will be other #s in smaller print which rate tire wear rating(how long a tire is rated to wear such as 400 or 450 etc)
also letter rating related to traction, heat wand wear , these are A,B,C
and of course tire pressure recommendation