I would bet that the bike will handle better with the stock size vs a 180 if both were the same tire, simply because it is engineered for the 160. A bigger tire throws the engineered geometry off.You're using the term "upgrade" very loosely here imho. A 180 on that width of rim is only asking for trouble, as I'm sure many here will agree. Welcome to the forum BTW and be careful with that thing!
Go for it I went with a 180 rear and it fits perfectly rides and looks alot better.Im wanting to go with a 180 rear tire, any thoughts on on whether this will fit on the stock wheel or will there have to be some modding done to fit a r6 rim onto the bike. Just wanted to see everybodys thoughts. Thanks!!!