Re Williamson's tyres - My first OEM set of tyres did this. The cause is under inflation. See the raised lip on the trailing edge of the tread
I only got 13,000 kms off the rear. I researched what I had done wrong and too low a tyre pressure for the weight was the issue. There is a thread on it somewhere in here.
42psi is fine for the bike when you ride it out of the show room as a empty bike.
42 PSI is under inflated for a bike once its loaded with:-
Bigger windscreen, tools and tyre repair, farkles of all kinds, tip over bars, highway pegs, GPS, Phones, comms, SPOT, extra lighting, water and snacks, cleaning can & cloths, wet weather gear, compressor, disc lock, seat covers and after market seats, etc.
That's just for all your normal riding -
Then you throw on the wife, or extra bags or a sleeping roll, fill the pannier bags, add yourself and helmets and jackets, and maybe a trailer
All of a sudden your bike is half a tonne in weight and 42 PSI wont cut it
For my sets of tyres since I have run 44 front and 48 rear and now get 20K minimum.
If I recall right I remember Diesel running a lot higher pressures and getting 29K from a set.
Food for thought if you are loading up your bike and riding a long distance