I am thinking of going -1 +2 on my front and rear sprockets on my 02 ZX9R. I made that same change to my 06 919 when I had it and loved it. Here is the way I look at it:
1. I am an acceleration junkie. That is my hook. I enjoy that part of riding probably more than anything.
2. I will never ride my bike at 170 mph
3. I do mostly short jaunts with very little highway riding so increased rpm at cruising speed isn't a huge thing.
Yes, I realize my speedo will be incorrect and yes I realize as I stated above that my cruising rpm range will be higher, but why not put that power where I can actually enjoy it instead of leaving it unused up top?
Does my reasoning make sense here? After having done the same thing to my 919 I can't think of any other negatives.