I am wanting to purchase these rims in black

I would like to also purchase a set of Yokohama Advan AD08 in 235/40/17
Reason as to why I am asking is that these wheels in 17 inch only come in 7.5 width, so is it stretching the tire too much?
Also what offset would I want to fill the guards and to not scrub (I am running on the stock suspension right now), and I do not want to roll the guards. It appears that in the 114.3 stud pattern, the offset provided is 40 or 50
Just some extra info, bore diameter (whatever that is) is 72.6, is this something to do with requiring a hub ring?
These are also stated as being 17.5 pounds, are they heavier than stock?
Thank you, patiently awaiting your input!