Hi, my experience. Trying to find suitable 19" off-road tyres (tires for you) is difficult.
I took the 'usual' route and went for 18's. In trying to get width and toughness, I went for GY silent armors (also with Kevlar, or aramid fibre) in 265/60R18. The diameter of these is 775mm and they did rub a little on full lock and didn't clear the intercooler vents by much. In hindsight, 255/60R18 would have been better.
Now, mine is a T2 with air. Diameter for the standard 275/45R19's is 729mm.
Now getting to the point of what you were asking... the 255/60R19's are 790mm. I think this is too big. Fitting larger diameter, apart from the rubbing will probably adversly affect your fuel consumption and the vehicle will feel as though it is struggling a bit. I've been caught by this before & kind of forgot. (duh) Yes, it's even noticeable in the V10.
I love my 19" wheels and suspect I will revert to them if I can find a suitable tyre.
Most unfortunately are only a 2-ply sidewall. Finding an LT spec tyre in 19" is hard.
Even the Cooper Zeon LTZ, available in 255/55R19 (762mm) has only a 2-ply sidewall.
(extra rubber on the shoulder... but)
To sum up, I would recommend no larger than the 255/55R19's and if you can get better than a 2-ply sidewall, tell me about it.
I include a pic of my SA's showing the clearance, remember these are 775mm dia. Also, what happens to a 2-ply sidewall if you are not careful or drive too fast, Cheers, Dub