Royal Enfield Bullet Diesel does Roman Road.

This machine can hardly be described as 'performance', being no faster than a very tired 350 Bullet, but if you are in no hurry and can find some quiet lanes where there is little in the way of other traffic to form a line behind you, I guess it could possibly be described as 'relaxing'. It can also do around 600 miles on the [very large] tankfull, but I would want to take several breaks between fuel stops! It is what it is, I suppose ...