I immediately thought it had happened after the tyres being fitted. In hindsight I don’t know how long the problem has been there. Although I ride it daily and travel to my ladies two hours each way weekly that’s through the town and hills to her place. I probably haven’t had to brake reasonably hard over the 100 kph for a while.
The problem is very speed specific. Smooth as below and quite a violent vibration through the handlebars, instruments and mirrors above. The brake lever doesn’t pulse but I’m not sure it even would being hydraulic.
All I’ve found on the Net has been, faulty tyres, steering head bearings, disks warped and the bobbins holding the disks in place seizing.
The problem is how dramatic the change is from above and below a 100 kph.