mainly the rear. the hack tire is a used cross tire only mounted so I could test drive, cant see any wear at all. front wheel ok. the rear wheel is after 3000km pretty much gone. is this the nature of the tkc or just normal with any tire on a heavy hacked gl 1000? have been locking for new tires and found heidenau k37 front and k60 rf rear and hack. they are a lot cheaper so I can afford some heavy wear, but yet 3000km on the rear is a little to much. any ideas?