http://www.talon-eng.co.uk/talon-pro...&newbike=15611

Talon made rims/hubs XXXpensive but the dog's nards

East Coast Wheels - USA
http://store.eastcoastwheels.com/supermotard.html

Roost Racing / Supermoto

http://www.roostracing.co.uk/supermoto.php

Best of the lot is this one company in UK

http://www.central-wheel.co.uk/cwc/spokes.html

Good luck