albertaduke
former airline pilot without the big bucks
Sounds a bit like the harsh feeling I get through the foot pegs on my 2010 Roadster. Mine is coming from the clutch, next time you notice it try pulling the clutch a bit. Just take up the free play and the harsh vibration will go away. Mine has done it from new, been back to Triumph they rode it for a week then told me they all do it but only some riders notice it. Didn't believe them but it is still going and still doing it. A few others have mentioned they have the same thing over the years.
somebody might make a better clutch for the roadster again some investigation to see where it lead>