Tyre selection

Gday

Mate the sales people will always push the brand they sell but BFG is a top 4WD tyre just make sure you get the BFG’s made in the USA, I use cooper AT’s my self.

Why change the rim unless you think it is necessary then you have to pay for the rims and tyres.

15inch are more common but unless you r going super remote getting 16 inch tyres wouldn’t be a big problem.

If you change rim size then I would tell the insurance company about it.

This is only my opinion but.......................

Go for the BFG.
Rotate them regularly.
Stick with the rims that came with the car.

235/85/16 are a good fit if you want to go slightly taller than standard. No legal hassles, good off road. Speedo may be out a little but you get used to it real quick.
Just go for a drive with another vehicle. Get them to sit on 80 and see what your speedo says. Do the same at 100, and you know what's goin on.

The guy who told you to fit 15 inch rims should have done some research before telling you that to push his stock. I wouldn't be too sure that if you have 16 inch rims, 15's would necessarily clear the brake calipers... not sure about the Navara though.

Thanks for all the advice. One point the guy made was that i can get tyres no probs on the 16 inch, but if i go for 15 inch, the tyres will be wider and cost the same money. This is the advantage he put too me - same money wider BFG's.

So if by chance the smaller rims fit, i get wider tread, is this a sensible move?

i have no idea as to the different widths. You know how it is, the wider tyres look better etc.. it's hard not to want that "look". as for 4x4 ability i think it will make no difference.

Wider tyres WILL NOT make your forby go ANY better in ANY situation, except maybe on rocks. I mean big rocks.

It's the nut behind the wheel that makes the difference.

I've had a navara with the stock rims and tyres and had no difficulty on the beach, boggy or not. Just let em down.

Before that I had an FJ45 with stock 750/16 on splits and went everywhere anyone else did.

Depends on what sort of driving you are going to do with your tyres.
The 7.50 X 16 are standard in remote areas. A good LT tyre with thick sidewalls is great on the western outback tracks etc but not good for highway travel. Rock and mud tyres are a different issue which have been covered here many times.
The holy grail of 4wd tyres is one that does everything equally well, and in my opinion there isn't any such creature. (and doesn't that fly in the face of million dollar advertising :)
Wider aggressive tyres look the part, but unless you're cruising the streets od Surfers, forget looks. One decent stake can turn your million dollar tyre into a pile of useless junk in the blink of an eye.
Decide what you are going to use them for then look around again.
Tyre salesmen are just that.