Re: Heavy Duty back Rim ?
First, a heads-up: what you're looking for has a price tag. But I've bought something like what you're asking about and it's very good. The price is right. Take a look at Pirate Cycles Worksman Wheels. He makes hub adaptors to fit those. The Worksman wheel will take some punishment. The hub adaptor will bolt to its hub, can be adjusted linearly, and the drive sprocket is bolted to the adaptor - so you can change to another bigger one or smaller one easily if you desire. I think Sportscar Pat makes an adaptor too, his should be pretty good also.
"There is nothing wrong with wanting a motorbike that is an extension of your personal taste and fashion sense; if you must ride somewhere, I say do it with style