My bike has the wide whitewalls. Size on the rear is MU85B-16. These are equivalent to a 140 width. Not quite the 18" you're looking for but here is what the whitewalls look like on my FLSTC.
Richard - "Bikergeek"
2008 FLSTC Heritage Softail Classic 105th Anniversary Ed., V&H Big Shots Staggered, Stage 1 kit, "Got Saggy Bag" kit, Harley Davidson ThunderStar Textured Black Wheels, Harley Davidson Combo Speedo/Tachometer Cluster
Last edited by bikergeek; 12-02-2012 at 07:42 PM.