Originally Posted by DearthVader
I sent a message off to bicycle-enginesdotcom and received a reply literally within five minutes.
If I choose the HD axle option I will lose the option to use a multi-gear sprocket.
Ahh, not good. You really want gears. (I run out of gas about once a month and have to peddle home) You have decided on a good foundation and think going stock for now will do fine. One of the really great things about building these things is your not stuck with any decisions and can swap out components when ever you want.
Tyrslider here does custom wheels. He is who I ask about this stuff. http://motorbicycling.com/members/tyrslider/