David. wrote: The rear will be a "C" version code, as confirmed by the Tech. Databook page 81, thanks.
R 1250 RT MY 2019 - 120/70 ZR 17 M/C (58W) TL Roadtec Z8 Interact M, 180/55 ZR 17 M/C (73W) TL Roadtec Z8 Interact C.
Just had a look at the Metzeler Germany website. For the 1200RT LC both the "C" and the "O" are recommended for the rear.
If I remember rightly the "O" was the spec to go for at the time.
For the 1250RT, only the "C" appears to be recommended.
No Roadtec 01 is recommended for the 1250RT
For the Yamaha FJR1300 the Z8 is recommended in "O" spec (rear) as are the Roadtec 01s.
Trying to follow the logic of the German allowed tyre combinations absolutely does my head in.
My thought - just be sensible and choose a suitable tyre. Remember that the Germans have to allow for sustained cruising at near maximum speed, two-up and fully loaded.