My (new to me) 2000 has cupping front and rear.An earlier post in another Topic asked where the 36 psi front recommendation came from.....the service,owners,and supplement manuals.I just checked all of them and the Kawasaki advises 36 front and 41 rear.If I am understanding the members suggestions they are saying the factory specs are too low.On my previous ZRX 1200 I used the front brake HEAVILY and put 14,800 miles on it in 2 years.I never had a cupping problem ever using the factory specs.I am starting to wonder if this is a connie shaft drive issue.Since a shaft drive tries to climb the rear suspension I guess theoretically it could be possible that it might cause cupping of the tires on certain machines,depending on individual quality control,machine specific clearance and tolerance issues.I have read a few posts that have said that they didn't have any cupping problems period,on machines with 75K plus.So,finally,since Kawasaki has produced a LOT of connies it isn't beyond the realm of possibility that this is a connie issue.Some have it,some don't,or so it seems anyway.Mine has it in spades with 12,800 on the clock.It needs new tires BADLY also.Thx for your time.