Hi Richard,
I would like to hear what tire your dad selected to install on his 961 to replace his Dunlops.
I have Dunlops on my 961 . . . the ones that came on the bike, and likely the same ones you and your dad have on your bikes.
These tires perform well reasonably well when warm, and on dry roads; but I have had the rear tire let go on me when I am accelerating out of a turn on a damp road or on a cool day! It has never caused a crash, but it has caused a fair amount of consternation. I am not a "power rider" or an aggressive rider, and I drive in a very conservative manner at all times!
I am seriously considering ditching the Dunlops and going with Michelin Pilots or Bridgestone Battleax tires. Or I would like to hear your thoughts and recommendations!
Don