Not sure how you would tell to be honest mate, without measuring and comparing that to another of standard height.

Have you got any pictures of it, someone may be able to give you a rough idea.

With 215/40/17 you should have no issues on anything up to 8 inch wide with the offset between 35-40 i wouldn't think. You may need spacers if it catches on the inner edges but thats unlikely.

Really though it depends how low it is