I too drool with the wide rear tires but its not worth your life! read that thread please!180 is kind of small. Go for a 190. Bigger is better. Ignore what everyone else says. And read this thread - awesome example.
Its like dressing up a hybrid to look like a muscle car.I have a 180 on my bike and I like how it handles and how it makes the bike look. Looks more like a "real crotch rocket", like an R6 or something like that. I got my raven from trading a supermoto I had. It had the 180 rear on it already. I will definitely keep it on there. Just my personal preference. I am trying to make my bike more like a "race bike" than a touring bike. Just my 2cents