I'm thinking of getting a set of Hankook tires for my '97 SE. Does anyone have any experiences with these? I'm looking for decent performance all season tires. Another thing i'm not quite sure as what the #'s stand for

my size tires are 215/55-16. I know that the 215 stands for the diameter, 16 for the rim size, what about the 55? does that stand for the width???

Another thing can I put on wider tires, or overall different size tires without changing my rims or suspension?

Thanks in advance for any insight