we use 6061-t6 for machining wheels.. 7075 is overkill and is more liable to cracking I feel. most blanks are Forged and I would have to request what alloy but the decision out is alot different than billet phone out. Amazing layout two-piece forged wheel You might supply us https://zanelhxyd.wikitidings.com/5039143/flat_slant_post_wheel_things_to_know_before_you_buy