I have a -07 Speedmaster and I didn't like the cast wheels. So I bought hubs, rims ans spokes from CWC in Birminham UK. Its the same hubs as on Tiger and (3 cylindre) Thunderbird Sport in front (both have twin-discs), and included America in rear. Everything fits right on!
I had to adjust my front mudguard mounting holes a bit since I went up to 19" in front.
I bought a hub for a Thunderbird sport for the front wheel. I think it looks better. Its a slightly difference in the area where the spokes are inserted. The Tiger is more "off-roadish" if you ask me.
I have a 180/55-17" rear tyre and there is plenty of room.