I am running these on my Thrux:
Model: V-Track Forged (1st Gen - no longer made in an 18 front)
Size Diameter/Width Front and Rear: 18x3.50 Front 17x5.50 Rear
Color: Black - Hard Anodized
Link if possible: http://www.forged-wheel.com/1SHOPTRITHRUXTON2009.htm
Tires: Avon Storm2 Ultra 110/80-18 & 150/70-17 (going to a 160/60 rear next now that I have a 944 kit's power/torque to deal with!)
As stated, reduction of unsprung weight is stunning and has a tremendous effect on handling. I hate tubes and tube type tires and was one of the reasons I made the switch...