Bonz (Vic) replied:

Whatre u running at the moment?

Take a look at this tyre calculator for some handy information.

I went to 265/75's on the Patrol from 265/70's (std) and didnt notice any change. Now going to 285's and wondering the same thing.

burnsy replied:

In a nut shell it is tractive force that you put on the ground. The further away from your axle center the ground the less force you can put on the ground which leads to less" push" The same goes for your brakes which will give you less braking force at the road the further the disk is away from the road. If you can imagine turning the wheel with a short wheelbrace with the brakes on you may not move it Change to a long wheel brace & you may be able to over ride the brake. This is the main reason the the law restricts tyre sizes from standard as it reduces braking effort.If the tyre is too large the brakes may not supply enough braking effort to stop you quick enough in a emergency
You can get very complicated with this but if you can get your head around what I am saying you can understand the theory

Member - Davoe (Yalgoo) replied:

265x75 are a common fitment to Pajs and i dont think you will notice any great difference or encounter problems

marq replied:

Like towing a 1ton trailer

Froilan replied:

did the same size upgrade on my previous nm paj. did not notice any power loss, however the nm was a 3.5 litre. fuel consumption went up though I would say due the heavier tires. they were LT construction.

Ozboc replied:

Trying to pretend to be a standard nissan ??? :)

Boc

Member - Oldplodder (QLD) replied:

Put some 32" od 235/85/16 on my 1996 NH GLX, same OD as the 265/75/16.
Original tyres were 235/75/15 (29"), so 10% change.

If yours is a GLS, they had 30" OD tyres, so not as much difference as my GLX.

There is a noticeable difference (10% less power to be exact), but then i have the 2.8 diesel as well.

Petrols have more torque down low , while the diesel has some turbo lag until it gets to 1500rpm, then the torque cuts in. So off the line, there is noticeably less power for me, would not be so obvious with a petrol, but you will feel it.
About the same as being empty and having 5 people aboard.

Still tackle most sand in high range 1st or second, and no noticeable difference once you get going, since it is only 1 to 2 km/hr per 1000 revs.
1st was 6.3km/hr @ 1000 revs, now 7.0.
2nd was 10.8km.hr @ 1000 revs, now 12.
Big advantage for me in sand is greater clearance under the front bash plate on rutted sand tracks. It doesn't play bull dozer as much since the front is now 1.5" (38mm) higher due to increase in tyre radius. You could jack it up another 1" (25mm) on the torsion bars. I have 2" lift in the rear coils.

Getting better economy once you adjust for the speedo, especially on the highway. Improved about 5 to 10%. But you may not see that with the wider tyres.


I find my speedo now reads 3km/hr under at 100 (100 is really 103), and the odometer under reads by 5% (95 km travelled is 100km).

4th is now better for overtaking on the highway and hills, since it is higher, and you can easily rev it out to 120. Pajero always felt under geared before, and I was looking for 6th on the highway.
Pajeros have a low first gear, so not so much difference (but there is some) pulling away from the lights, as stated above.

Not quite so good in low range 1st on knarly tracks, but if I was serious, could drop in some 2.85 gears in the transfer case instead of stock 1.9 for low range.

Hope that helps :o)

Mike Harding replied:

Thanks for the explanations about larger wheels and brakes everyone - I now understand what the issue is.

Mike Harding