Real width please ?

Found it, sorry, it's in the owner's manual which is available on their site, to wit:

http://images.triumphmotorcycles.com/media-library/0135A2A843054395B6F7A2092BD321BD.pdf

or

http://tinyurl.com/l8w2n4g

There is a diagram on page 103, under 'Specifications', and the answer is:

42.1" (1,070 mm)

And the length OA is 102.5" (~ 8-1/2 ft) (2,603 mm)