Vehicle Engineers reports, 4WD Modification rules, whats allowed, what not...

[BigRAWesty]

412 now...

How do you not have 5000 posts???

[mudski]

Heres something I have just found out. I was looking through the factory specs of the Y61. I had them emailed to me from Nissan when doing the TD conversion. The DX Patrol came out with split rims from factory. The tyre size is 7.50 R16. In the old money, the rolling diameter is 33inch. Give or take a bit depending on tyre brand.
Section LS 4.2.4 Overall tyre diameter states "The overall diameter of
any tyre fitted to:.....Must not be more than 50mm larger or 26mm smaller than that of any tyre designated by the vehicle manufacturer for that vehicle. "

Does this mean that if you have a DX you technically can get away with 35's?

[Winnie]

I would think that if it is allowed for the DX then it would be allowed for any model, because the 33" is an option on the Y61 Patrol.
Is there a limit on increase in tyre width?

[mudski]

I would think that if it is allowed for the DX then it would be allowed for any model, because the 33" is an option on the Y61 Patrol.
Is there a limit on increase in tyre width?

According to the spec sheet I have from Nissan. 33" in not an option on anything but the DX.
https://drive.google.com/open?id=0B9...l9MZ1Z0c3FMUEU

[the evil twin]

How do you not have 5000 posts???

Because I exercise judicious restraint and tolerance only replying with coherent, relevant, thoughtful, incisive posts that are always 100% on topic...
aaand...
the $#%^%$ Mods deleted the other 15,000

snip...
Section LS 4.2.4 Overall tyre diameter states "The overall diameter of
any tyre fitted to:.....Must not be more than 50mm larger or 26mm smaller than that of any tyre designated by the vehicle manufacturer for that vehicle. "

Does this mean that if you have a DX you technically can get away with 35's?

'That vehicle' means that vehicle not a model or series run... so if you have a DX placarded by the manuf for 33's then cut sick.
As a point of interest I know of the odd case of people attempting to swap DX tyre placards onto ST's etc

I would think that if it is allowed for the DX then it would be allowed for any model, because the 33" is an option on the Y61 Patrol.
Is there a limit on increase in tyre width?

Yes, sort of...
While not specifically tyre width there is a limit in allowable track width (1 inch in NSW and 2 inches in other States for live axles or at least that is what it was a couple of years back)
Sooo...
As you increase tyre width you usually have to start changing rim offset so the inside of the tyre will clear the guards etc on full lock
Each inch of increased -ve rim offset will increase track by an inch (2 rims per axle/2)

[threedogs]

Heres something I have just found out. I was looking through the factory specs of the Y61. I had them emailed to me from Nissan when doing the TD conversion. The DX Patrol came out with split rims from factory. The tyre size is 7.50 R16. In the old money, the rolling diameter is 33inch. Give or take a bit depending on tyre brand.
Section LS 4.2.4 Overall tyre diameter states "The overall diameter of
any tyre fitted to:.....Must not be more than 50mm larger or 26mm smaller than that of any tyre designated by the vehicle manufacturer for that vehicle. "

Does this mean that if you have a DX you technically can get away with 35's?

If thats the case it must be pizzing off every ST,,,ST-L and Ti owner.
By the letter of law an increase of 50mm is legal eh,,,lol

Would make a good case to run 35"

[nissannewby]

Heres something I have just found out. I was looking through the factory specs of the Y61. I had them emailed to me from Nissan when doing the TD conversion. The DX Patrol came out with split rims from factory. The tyre size is 7.50 R16. In the old money, the rolling diameter is 33inch. Give or take a bit depending on tyre brand.
Section LS 4.2.4 Overall tyre diameter states "The overall diameter of
any tyre fitted to:.....Must not be more than 50mm larger or 26mm smaller than that of any tyre designated by the vehicle manufacturer for that vehicle. "

Does this mean that if you have a DX you technically can get away with 35's?

No. Because technically 2" is more than 50mm

[Cuppa]

No. Because technically 2" is more than 50mm

Might need the metric diameter of a 7.50 R16 AND the proposed '35's'. Not saying they would, but it's possible they might just scrape in under the ruling?

[nissannewby]

Might need the metric diameter of a 7.50 R16 AND the proposed '35's'. Not saying they would, but it's possible they might just scrape in under the ruling?

They are only 32" roughly.

[Cuppa]

They are only 32" roughly.

So maybe tyre manufacturers need to bring out 34" tyres?