When you installed 190/55, can you tell your bike height increased?
Do you need adjust rear suspension?
You shouldn't have to adjust your suspension, the increase in sidewall height on the 190/55 isn't enough to make that much of a difference for everyday street riding, and even leisure trackdays. Of course, when you're speaking on a professional level, like for instance MotoGP, then even the slightest change can difference. Here's and excellent thread on the topic of tire size .... http://www.1000rr.net/forums/showthread.php?t=46188