I found it in the dumpster. I guess it's from one of those little toy motorcycles. It's about 8 3/4" in diameter and threaded for a freewheel on each side. The freewheel is huge and the teeth are for something like 1/4" pitch chain, maybe 6mm?
I guess I'll keep the freewheel and the chain tensioners and put the rest back in the dump unless anyone out there can use it. I thought you'd like to see it anyway.