The narrow 19" have less contact with the tarmac = less friction = fuel efficiency and less noice than wider tires.
I've only just noticed this. Maybe I have made a mistake in opting for the 19" Wellington's over the standard 18" Detroit's.
What I would like to know (which obviously means I have a very keen interest) is to find out by how much the Wellington's are less capable of grip; be that in emergency stopping or generally road holding.
If anyone has seen any links or information I'd be happy to go dig deeper.
Thanks.
EDITED: There's a good explanation in the values of 'taller & thinner' tyres here:-
http://www.moderntiredealer.com/article/312194/the-skinny-on-tall-thin-tires
I now have a greater understanding on the science on the 'taller & narrower tyres.
From a visual point of view it is easy to believe these tyres have less grip, whereas from a scientific view it is quite the opposite:- There is less aquaplaning and thus greater wet grip, less rolling for a firmer ride and better control, which in turn creates a better energy efficiency and less road noise.
All of a sudden I feel a lot happier with my choice.