First off, Haze748 your asking for trouble with your tire setup. You have a stock dunlop front with average grip, then you have a Power race rear with extremely well grip. You are pushing the front and may even tuck the front if you push it hard enough (not sure how fast you are). I would pull that front.
As a rule, if you are going to run different compounds you always want the front to have more grip than the rear. I run Michelin Pilot Race or Slicks and usually do a soft front and a med/soft rear. I can control it a little better when the rear breaks loose rather than the front pushing and tucking the front.
I usually go through 2 to 3 rears for every front tire. Those of course are track tires and on my R1. The litre bikes chew up the rear alot faster. I just built the R6 and havent been on the track with it yet to know how the tires wear.
DOnt worry about buying a new rear and not a front, unless you are going to go to a more agressive tire, then i would buy a set. try sportbiketrackgear.com for the best prices on Michelins.
If you are still a beginner to low intermediate rider I would go to Pilot power CTs. You can keep your stock front (until it wears) then buy a Pilot power CT front later. Or buy the set now and save the front until you need it (better deals when bought as a set).
Stick with the 120/70/17 front and 180/55/17 rear. Dont go to the 190 rear. The 5.5 rim wasnt meant for it. The R1's have a 6.0 rim that is made for a 190.
Any more questions give me a holler.
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