RE: 21in front and 16in back Will this combination work?
Ran that setup on my SG for a little while. Road and handled fine, I just wanted an 18x5.5. Just buy a chrome front and your set. Here's a link to a pic of my SG with a Weld on the front and a chrome Sportster wheel on the back. https://www.hdforums.com/m_1502249/tm.htm
RE: 21in front and 16in back Will this combination work?
Thats what I run. I lowered the front to 2" and the rear one inch and it is close to the original rake. Not enough to worry about anyway. I think it rides MUCH better now.