Stock rim width is either 15x5-1/2" or 15x6" depending on which style you have. Stock tire size for the 15x5-1/2" is 185/65-15 and for the 15x6" is 195/60-15. 205/55-15 is going to be a bit shorter than either stock tire size and if you have the 5-1/2" wide wheels then the tires will bulge out a lot. If you have the 6" wide wheels then you should be alright.

Oh and the ES100 is a fine tire in the rain, just don't drive in the snow with it.