Hi Jamal!
There are various posts on here about changing profiles on the tires....The consensus is, (and personally), I'd stick with the 180/55 rear. Tire preferrences are like oil...everyone has their own. For what its worth...I run Pirelli Scorpion Syncs...They are a great all around tire. They also get great reviews at Motorcycle Suoerstore's review page. Thet are nearly impossible to beat on price too! (Motorcycle Superstore I mean!). :)