Definitely looks to be other then stock wheel, but before you go investing $$$ into a new set, I would make sure how much you need to go and still clear a mower deck. In the end it will be your choice between different rims or spacing out your present ones.
My over sized/nonstock ones cleared ok but not if I wanted chains on them. So I went with a half inch out on both sides and still cleared my deck with out having to remove the spacers.
Just trying to throw out options.
