NSW VSI Wheeltrack, wider wheels and bigger tyres

[sebfox]

Hi
I have just bought a 2001 GU and want to set it up so it can do the harder tracks. I would like to stay within the NSW VSI 6 and VSI 9 guidelines with regards wheeltrack, wider wheels and bigger tyres. The vehicle currently has the factory alloy 16X8 wheels.
So I am trying to work what’s the best method to increase the wheeltrack by the permitted 25mm? (Wider wheel, different offset?)
The tyre placard shows the tyres as 265/70R16 (30.6”) so going by VSI 6 which allows a 7% increase in tyre diameter without certification equates to roughly a 33”. Does this seem right?
Cheers
Seb

[MudRunnerTD]

Hi Seb, yes you could fit a wider offset rim. The Nissan offset is +10 so you could probably go to a Zero offset and a 285/75r16 tyre.

I have ignored it though like many others. But that's just me.

[BigRAWesty]

You guys are lucky, legal 33's..
Here we are allowed 7mm increase..

Anyway, if your hell bent on legislation and legalities and also will be travelling around aus then start researching for the minimum increases across the board..
I think you'll find when it's all said and done you'll be fitting a 50mm lift and that's it.. Lol..

[sebfox]

Hi
I have done a bit more research (all very confusing) but according to the VSB NCOP11 Section LS Suspension and Steering V2 the wheel track of off-road four wheel drive vehicles must not be increased by more than 50mm. So that is better than the 25mm that I was looking at in the VSI.
If the above is correct it looks like I could get 16X8 wheels with up to a -15 offset. The alternative would be 9” wide wheels (assuming you can get them) and +10 offset. Not sure as to what would work best?
Cheers

[MudRunnerTD]

16x8 in a -13 offset is a common size.

[sebfox]

16x8 in a -13 offset is a common size.

Thanks for the info the -13 offset widens the track by around an inch on each side and stil remains within the regulations so that works for me.

Cheers

[sebfox]

I have done a bit more research and according to “Vehicle Standards Bulletin 14 (VSB 14)” section “NCOP11 Section LS Suspension and Steering V2 01Jan2011” I hoping to be able to run 34” tyres.

I have copied part of section 4.24 below

4.2.4 Overall Nominal Diameter
The overall diameter of any tyre fitted to a passenger car or passenger car derivative must not
be more than 15mm larger or 26mm smaller than that of any tyre designated by the vehicle
manufacturer for that model.
The overall diameter of any tyre fitted to:
* 4WD passenger vehicles specifically designed for off-road use (typically MC ADR
category). All wheel drive (AWD) vehicles including those AWD vehicles that may be
certified as MC ADR category, (also commonly known as soft roaders) are not
included in this category;
* 4WD goods vehicles and their 2WD equivalents if the chassis and running gear are
essentially the same as the 4WD version (N ADR category); or
* any medium weight goods vehicle (NA2, NB ADR category).
Must not be more than 50mm larger or 26mm smaller than that of any tyre designated by the
vehicle manufacturer for that vehicle.

If I understand this correctly I should be able to increase the tyre size by 50mm to those that are listed in Owners Manual (Publication no: OM0E-0Y61G0), which lists amongst others a 245/85R16 which in inches is 32.4”. So 32.4” plus 50mm would equate to a maximum size of 34.368”
I am planning to get the vehicle engineered once the bar work and maybe a bigger lift are done.
Cheers

[sebfox]

Spoke to the technical department at RMS (NSW based) and they said I unless I go via a Certifier than I can only go 7% bigger than what is written on the tyre placard.