75 = The "Profile" of the tire. As you know a profile in any case is a side view. So when looking at the tire from the side you would measure the amount of rubber that you see. 75 mm.
uhm... as far as I understand, 75 is the relation between tirewidth and tire height. So 75 means the sidewalls are 75% the height of the tires width...
Feel free to correct me if I'm wrong.
__________________
roadrazer - 300kgs, 300hp = pure fun.
|