Up to this season I had Tropical Tube(Lui) GS 185 custom build for a racer and the max stance I could get out of it was 50cm (19,6 inch). The stance was ok for me and I did not even consider going wider 1. because I could`t and 2. I didn`t think it would improve my riding.
OOOH How wrong I was!!
This year I got my hands on a black top Kessler GS 185 :1luvu:and after reading this thread I experimented a bit and came to the same conclusions as Zoltan!
I`m now riding 52.5 cm (20,67inch) stance 3 deg front lift (flat) and 6 deg back lift (inward cant) and it feels awesome:biggthump. Much more stable than before and because you can tuck in better, more power during a carve.