Tony if these are the Bridgestones, I wouldn't put them on again. My first set wore similar to yours. I can see the scalloping in the photo. Now use the Michelins, which I hadn't been a fan of in the past but they seem to suit the 1300. Maybe a combination of conditions, rider, riding style, but i'm very happy with the PR2's and have had them fitted for the 2nd time. I run 42 / 42 PSI solo and can't fault them as yet.
Cheers.
Skip.