"Fixes spelling mistakes in Car Customisation menus (e.g. Tyres = Tires, etc.)." Tyres is the correct British spelling of Tires, and since it was developed by a Studio in Newcastle(Britain), it's hardly a spelling error. They just didn't compensate for the fact it was set in New York.
Topic on Talk:Driver: Parallel Lines
It is, because most of language used in this game is American English, so it's spelling error from this standpoint