Is this a model T disc wheel?
Short answer, no. Model T's didn't come with disk wheels. Not Chevrolet ether. Could be from any number of low price cars. If it was marketed for after market replacement for Ford it would have come as a set with hubs.
I had a Jaeger hit-n-miss cement mixer with 4-bolt disc wheels like that - it was late 1920's vintage.
I think it's a Star wheel, but that is just a guess.
My Dad's 31 Austin Bantam had similar wheels. Not sure about the tire size though.
Not yet - but could be, if three more can be located
Michelin made wheels with 4 studs. Steve Tomaso has some on one of his cars. The ones I have seen were all 30x3 1/2 and are clinchers, not split rim. I have know idea if they made any 21" or not.
The Disteel (sp) wheels for the T had only 3 lug bolts.
The Chevrolet Wheels were 6 lug.
I have some Star wheels, but they have none, they are riveted to the hubs. Could be a later Star, but I don't think it is either Star or Durant.
1931 Austin Bantam, photo off the internet.
How to check the date on a tire.
Aaron, interesting. My Star experience is from another century, 1971 to be exact. For about 4 months I owned a '23 Star 4dr. Long story, but regret selling it (however, it probably was the only thing I could do at the time, fresh out of High School & no money!).