I think I generally understand ETRTO, english and French sizing nomenclature. However, I don't understand what HS 430 means vs "profile" HS 338. Is this somehow pertaining to the width of the sidewall? I notice this kind of designation is not on all of the Schwalbe tire lines.

Thanks for the help

http://www.schwalbetires.com/bike_ti...ires/big_apple