Dear MB,
I
Sincere appologies for the late reply, I just found your email in my spam box, I had thought I hadn,t got any replies.

Thanks for the note, I have been doing the calculations and roughly I have made a 9% diff ratio change ..... (thats 2 ratio steps from the typical options avail) I decided to go for the big change and am very happy I did, such a great driver around town now and absolutely epic in the bush so I have no regrets however if i do long road trips (with no offroading planned) the increase infuel burn becomes an issue ( I had originally planned to go bigger wheels with the ratio change to go with my 2" lift but was so happy with the truck with the ratio change I have been in no hurry.

I have been looking at whats out there tyre wise and by current tyre size is 265/70 R16 (30.6" dia) so I roughly worked out the following now:

285/75 (32.8" dia) a 2.2" taller overall dia being about a 7% change
275/70 (31.2" dia) a .6" taller overall dia being about a 2% change
265/75 (31.6" dia) a 1.0" taller overall dia being about a 3% change


Therefore the 285/75 is approx .8" wider than I have now and 2.2" in diameter bigger (IE: 1.1" lift) so overall this size seems to be the most obvious choice for long road trips without loosing my full 9% change and more likely will be my choice if just looking to improve fuel burn on long trips however the 265/75 might be a step better in burn but keep closer to the ratio i am enjoying ....... in the end it might end up being 2 sets of wheels.

All very interesting but once I got into the revolutions/mile of tyres my head got dizzy so like most things it might end up just being a bit of trial n error.

Brgds/Ian


G’day Ian Mate,
As a rough rule of thumb I believe Patrol 5% is a fair guesstimate gear swap ratio/tyre gauge:
Differentials- 3.9 <> 4.1 (5%) / 4.1 <>4.3 (5%) 4.3 <>4.6 (5%) etc….
In regards tyre diameters my noggin only comprehends imperial sizes:
31” <> 33” (5%) / 33” <> 35” (5%) etc….


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