I have to agree with the 180 as well. With the 170 you are right on the edge of the rear tire, reducing contact patch and traction exiting corners. The 180 will allow you to get the throttle open all the way, sooner than the 170. There are more tire choices available, I am currently running Diablo Corsa III on my race bike and a corsa III front and standard diablo rear on the street bike. I can drag the fairing on the street with these tires, they really go pretty well.
I have run dunlop slicks before on the track, but never pirelli. I will try them this coming season if they will not upset the chassis set-up too much.
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