Lift and tyre size regulations

[Grantly]

Can any 1 tell me in victoria what is the largest lift and largest tyres i can run legally . I want to buy a Nissan GQ swb and put 2 inch body lift and 8 inch suspension lift in and run 35-37 inch tyres

[Rhysta]

Firstly, why the hell would you want to lift a shorty 10" jesus christ!

To fit 35's all you need is a 2" body lift and 2" on the suspension and all is sweet.

10" f lift on a swn and you will be on ur side more then you wheels...

[Grantly]

i meant 6 inch

[Nelso]

Take it from me you don't want to go that high with a shorty. I'm looking at a bit of work to bring mine back down from its lofty heights and I've got 37's. You only need 5" of lift total to run 35's.



Unless you've got lots of money and want to buy one with 9 inches of lift and 37's?

[jkv6]

which state are you in

if in nsw this may help

http://www.rta.nsw.gov.au/registration/ ... ml?rlid=21

[jkv6]

me dumb did not read vic do not ask now i did not see it

[Doggy]

Definately dont need to lift a shorty that high....if you sneezed in it, it would tip over . Mine is lifted 5" with just springs and quite comfortably fits 35's. Just trim the guards if you wanna run the bigger sizes.

[embryo]

cold hard turth is "leagaly" you can lift it X percentage of the original wheel travel, which equates to 2" in most cars (same goes for lowering) and tyre size is as per tyre placard. so 31s.

SORRY

[bogged]

Can any 1 tell me in victoria what is the largest lift and largest tyres i can run legally . I want to buy a Nissan GQ swb and put 2 inch body lift and 8 inch suspension lift in and run 35-37 inch tyres

even with a 6/2 lift, you will get hideous shakes and dramas..

you can fit those tires with a 3/2 lift...
see the 203498204982094230948230498 other threads on lifting mavs/gq's in the last 3 days for your answers.

[dogbreath_48]

I have mates running wide 35's with 2+2 (or less) lifts.

cold hard turth is "leagaly" you can lift it X percentage of the original wheel travel, which equates to 2" in most cars (same goes for lowering) and tyre size is as per tyre placard. so 31s.

SORRY

I thought tyre diameter could increase by ~50mm? So if a 32 is available on a shorty (as on split rims?) a 34 could be fitted legally - except that it would most likely be too wide!

-Stu

[bogged]

I thought tyre diameter could increase by ~50mm? So if a 32 is available on a shorty (as on split rims?) a 34 could be fitted legally - except that it would most likely be too wide!

so that would mean a 31 wouldnt it?

[dogbreath_48]

I thought tyre diameter could increase by ~50mm? So if a 32 is available on a shorty (as on split rims?) a 34 could be fitted legally - except that it would most likely be too wide!

so that would mean a 31 wouldnt it?

If you can't get hold of a tall and skinny...then yes probably a 31

[Beastmavster]

IS NCOP 100% in now in VIC?

If so:

NCOP is +50mm Diameter. Depending on your model GQ this would allow roughly 33.5" - 34.0" tyres. This probably means the biggest rubber you can score will be some of the oversized 33"s like Simex Extreme trekker, 255/85/16's (biggest 33"ish tyre) or 34" Jungle Trekker II.

Why people are saying 31" I have no idea.

NCOP allows for 50% wider on a beam axle 4x4 which means 15" wide tyres. Not a problem there. I think there may be some issues about running rims wide enough though. I dont think 10" rims are legal in most states... cant be sure about victoria. Why you'd want that wide and that much weight anyway is beyond me.....



All this is kind of irrelevant, since NCOP is not the only set of rules that apply to vehicle mods - to do things legally you DO have other choices so talk to a reputable engineer.

Note that some of those other choices are very expensive though.


In the end it comes down to:
a) what an engineer will approve
b) what vicroads will let you run regardless of a)
c) what you decide to run anyway regardless of b)

[Beastmavster]

By the way a 255/85/16 would be narrower than a 31x10.5x16 or 265/70/16 (both GQ factory fitment) so width is not an issue there even if they ridiculously said cant go wider than stock.

JT2's i think come in a 34x10.5 option as well.

[embryo]

IS NCOP 100% in now in VIC?

If so:

NCOP is +50mm Diameter. Depending on your model GQ this would allow roughly 33.5" - 34.0" tyres. This probably means the biggest rubber you can score will be some of the oversized 33"s like Simex Extreme trekker, 255/85/16's (biggest 33"ish tyre) or 34" Jungle Trekker II.

Why people are saying 31" I have no idea.

NCOP allows for 50% wider on a beam axle 4x4 which means 15" wide tyres. Not a problem there. I think there may be some issues about running rims wide enough though. I dont think 10" rims are legal in most states... cant be sure about victoria. Why you'd want that wide and that much weight anyway is beyond me.....



All this is kind of irrelevant, since NCOP is not the only set of rules that apply to vehicle mods - to do things legally you DO have other choices so talk to a reputable engineer.

Note that some of those other choices are very expensive though.


In the end it comes down to:
a) what an engineer will approve
b) what vicroads will let you run regardless of a)
c) what you decide to run anyway regardless of b)

latest paper work we got at work from vic roads says as per tyre placard. we were forced to replace a set of rims and tyres on a honda that we had RWC'd which then got canaried. vic roads says as per tyre placard

[cj]

My Engineer told me that he cannot allow anything more than a 50mm increase according to VicRoads unless I do some other (read costly mods) to upgrade bearing capacities etc. Oh and rims are to be no more than 25mm wider than the widest stock rim and keep in mind that track width cannot increase more than 50mm total for a solid axle so watch your offsets. I also have an email from the Head of Vehicle Standards telling me to work to the NCOP which allows +50mm increase in dia.

[mmaaxx]

Can anyone here please tell me according to NCOP what is the largest tyre I can legally fit to a 98-2004 IFS hilux as I know a few people with them and no one knows what the stock diameter of the split rim was?

I inquired with bob jane and the 7.5x16 split rim road gripper was stated as 29.4" . does that mean I cant go bigger than 31.4" ?

Do I go by the "actual tyre diameter on the spec sheet or do I go by the size printed on the side of the tyre as they are not allways the same?

Bloody confusing!

[Beastmavster]

Can anyone here please tell me according to NCOP what is the largest tyre I can legally fit to a 98-2004 IFS hilux as I know a few people with them and no one knows what the stock diameter of the split rim was?

I inquired with bob jane and the 7.5x16 split rim road gripper was stated as 29.4" . does that mean I cant go bigger than 31.4" ?

Do I go by the "actual tyre diameter on the spec sheet or do I go by the size printed on the side of the tyre as they are not allways the same?

Bloody confusing!

There's previous threads about NCOP and the vagueness of the tyre sizes.

There's some question over the interpretation of that clause that I have not been able to get a clear answer on. Since QLD has not instigated NCOP there hasnt been too much point chasing it further. However, it is something that we've discussed here before on a number of occasions.


It has a reference somewhere to original fitment that can be interpreted in a number of ways. For instance, if you had say a Bridgestone Desert Dueler 7.50R16 as original fitment back in 1988 on your 4wd.

Now, say that original compound and size is no longer available and you cant find out the original diameter specs.

1) Does this mean that you have to use the original one as your base size - even though you (nor Mr Plod) cant find details so you cant tell how big it is, and therefore how much total size is actually legal?

2) Can you use the nearest current equivalent available now - say the Bridgestone Desert Dueler 604V 7.50R16 at 809mm nominal (31.85"). And then add 50mm to that - meaning 33.85".

3) Or any Bridgestone 7.50R16? 811mm.. (31.93")

4) Or any 7.50R16 - because these can vary by up to an inch either way. I can find 7.50R16's up to high 32" (+50mm would allow most 35"s and 315/75/16) and as low as mid 30"s.

5) Or do you Base it on the default size in the tyre and rim manual? (Which only a few tyre fitters would have access to). I believe the figure in this case is 31.7" or 805mm for a 7.50R16, meaning 855mm legal.



Given 1) we have no clue so we just have to wing it. It's really a non answer unless said tyre is still available today in the exact same construction.

2) and 3) are at least measurable, but most manufacturers (Thanks Bridgestone who do) do not state diameters on product pages or websites now. Go check a few out to find out.

Note that there may be differences in size between our version of a tyre, the US version and the Japanese version......

4) with no product spec sheet to back you up, proving their size is ok (unless you keep a 7.50R16 spare) would be hard unless you had that specific 7.50R16 there. If it's your spare and it doesnt match the other tyres, they will ping you for that anyway.....

Also, some manufacturers deliberately make tyres oversize... great for us but not something you're likely to get away with just because Shonkycorp (TM) make a 7.50R16 that's 36 feet high.......


5) My expectation is this would be the most likely source of our size limit, but damn hard to prove since we dont all have access to this manual.... especially when pulled over at a roadblock coming out of a comp after a dirty weekend.

A manufacturer would not support you in your court case..... it's an insurance liability issue they really would not want to get into.

And traffic cops and transport departments tend to take a policy of guilty unless engineering docs stand up to intense scrutiny, and have been known to "de-engineer" vehicles on the spot anyway.....

As such you're probably stuck using the minimum of the above 5 and then adding 50mm.



If anyone gets a clear interpretation of how this should be interpreted in writing from any state's transport department please scan it and put it up here so we can all carry a copy

[cj]

I've been told it is based on the nominal size listed in the Tyre & Rim Manual and keep in mind that there are different sizes for different tread types e.g. Highway, Traction.

Every Tyre place I've been into has one of these manuals and has been happy to let me look through it or find the info required.

But honestly talk to an Engineer on the VicRoads VASS Signatory list and find out what THAT Engineer will allow (there are differences between them) as with what you are proposing to do Engineering is required to be legal.