ST1300
170/60 ZR 17 M/C (72W) TL rear
120/70 ZR 18 M/C (59W) TL front
The A spec tyre is not the normal size for the ST1300, and is not available. I don't use non standard sizes except in an emergency.
So, using the non spec A tyres appears pretty good to me, they are still the same set of tyres I had on for the run around Oz towards the end of last year (so that run, a run up to Barkley Homestead and back, plus all my running around back home, would have been over 20 thousand k so far) and I think there is still a good amount of tread on them, so much so i will be using them on a couple of runs that I have coming up shortly.
I will still go for the PR4 for my next set, if I can get them, if not then back to the Angel GT