I recently changed my rear tyre even though it had some tread left it as old enough to be close to year age replacement.The centre was finally finished off by some of the crappy road-resurfacing gouged road surfaces around here.
I now try to avoid these surfaces where I can as they can rip the guts out of Motorcycle tyres.I don't expect too high a mileage from my rear tyre/s due to my riding style but don't mind as they are a Sacrificial part and I like fresh rubber