Help ID vintage solid wheels

Hey guys, I wanted to pick you brains about a cool wheelset I saw today. My friend picked up a 75Z1 project in a box and he had some great extras too. Frame is powdercoated, 3" extended custom swingarm. Keihin fcr carbs, 18" wire wheels front and back, 3 seats, Yosh exhaust, etc....lots of coos stuff. Anyways, he shows me an extra set of wheels Ive seen in pics but never in person. They look like old drag racer era parts. The wheels are solid, look like they were spun. The front wheel is 19" has dual KZ rotors, looks dished or concave and is maybe 2" wide. The rear is about 4" wide, 18" with a 140 tire on it, and it looks convexed to a kz disc rear. The swingarm is a custom boxed piece, chromed, and has axle ajustments in the 19.5 to 21.5 range, so its overall like 23". I didnt take pics cause it was dark and my cell phone sux but Ill go back and get some soon.

Here are some imagaes I googled but kinda look like it. No they are like fatboy rims either. These are definitely old school by their patina.

Front wheel kinda looks like this


and the rear kinda looks like this


Any help would be appreciated.

Kosman ?

That name came up too but is there a way to ID them as Kosman? a stamping anywhere i should check? Are they worth anything?

A picture would sure help. Kosman just came to mind. If there like that there worth some bucks. 2-300 each id guess. Someone will let you know soon. Im guessing

performance machine,kosman,mitchell...........

Those look like the original Mitchell Performance Machine wheels when they used to buy stampings and fabricate wheels. This is before they started cutting spoke patterns, guessing late 70's to mid 80's. I'll bet you can still buy sprockets and carriers to bolt up to that 6 bolt pattern.

Thanks Jack, Those pics are just ones I googled. Ill take real pics soon this week.
And thanks for help guys

So I finally got the wheels and my friend is letting my "borrow" them to mock up on my bike. Im excited the more I look at them. They make the bike look "chunkier" if that makes any sense...Im kinda diggin it just by standing the parts next to the bike.
The swingarm is boxed steel, chromed, and appears to measure out stock length wise, it has a 140 tire on it but I might be able to fit a 150/160.
I could work out a barter for them so I may just keep them
I can honestly say Ive never seen a set like this in person and I think it works cause its period correct in a way.
Let me know your opinions....good or bad

I love em. have seen the rear (or similar) on ebay but I would think the front one is a first. Makes me wish I had the front and a 5.5" rear

those wheels are very unsafe if you ever find yourself caught in a cross wind you can find yourself several lanes over from where you started with no easy way to steer out of it.
picture walking down a highway carrying a sheet of plywood beside you and having a semi pass,basically same affect especially on front wheel

Ive thought of that too, trust me. Having no experience riding a bike with solid wheels, I wonder how the HD fatbobs track with their solid wheels.
Good Observation wireman

i somehow managed to survive the 80s when that stuff was the "in thing"! :woohoo: ive got a barn full of cast off retro metal flake stuff from 70s-80s! :sick: :laugh: