Outer Limits 4x4 Board

The famous topic.

Can someone please explain what the legal implication, regulations, guidlines etc are in relation to tyre & rim selection.

I found ADR 24 on Dotars and am somewhat confused given that it has been withdrawn?

Quote from DOTAR WEBSITE

"ADR 24 - Tyre & Rim Selection

The function of this Australian Design Rule is to specify requirements for tyres and 'Rims' appropriate to vehicle load capacity, 'Rim' size and speed characteristics.

This rule ceased to have effect from 1 January 2005."

http://www.dotars.gov.au/roads/motor/de ... nline.aspx

Maybe i have missed something, but can someone please clear this up for me.

Cheers.

Determination 5 of 2003 declared that ADR 24/02 would cease to have effect from 1 January 2005.

Im poretty sure what this means is the ADR should have been updated after january 2005, however, i have the october 05 edition and there is no 24/03

i believe that it is listed somewhere else, no idear where dont really care cos im going to drive on my swampers if its legal or not! but i believe its something along the lines of 'as per the tyre placard on YOUR vehicle'

embryo wrote:i believe that it is listed somewhere else, no idear where dont really care cos im going to drive on my swampers if its legal or not! but i believe its something along the lines of 'as per the tyre placard on YOUR vehicle'

cant see it in any other ADR

maybe the ADR no longer specs the tyre/rim combination requirements, rather, leaving it up to the manufacturer.

If you wish to change your tyre/wheel combination you must comply with the speed and load ratings of the tyre placard, or if your car is too old to have a tyre placard, you will need to comply with the adr of that time.

yeah its gotta be YOUR car. the clubbies came out with 19" rims on them but they also have bigger brakes, so you cant just put 19s on you stocka vy cos the clubbies have got them.

embryo wrote:yeah its gotta be YOUR car. the clubbies came out with 19" rims on them but they also have bigger brakes, so you cant just put 19s on you stocka vy cos the clubbies have got them.

you can(in qld) aslong as the tyre diametre doesnt increase by more than 15mm, or decrease by more than 25mm.

and aslong as the wheel can carry the load and speed of the one its replacing.

I don't mean to be rude, but no one has actually cleared anything up.

ADR 24 is to guide and determine, size, speed & characteristics.... bla bla bla. All the information about 15mm bigger than orig tyre size, of wider than max rim width, all came from this ADR!!

If the ADR no longer exists, what is the regulation!!!

Surely someone knows, and can give a 100% answer???
How about you engineers out there?

tbjaus2000 wrote:Surely someone knows, and can give a 100% answer???
How about you engineers out there?

why dont you call an engineer, or the roads authority in your state? Surely someone there knows..

tbjaus2000 wrote:I don't mean to be rude, but no one has actually cleared anything up.

ADR 24 is to guide and determine, size, speed & characteristics.... bla bla bla. All the information about 15mm bigger than orig tyre size, of wider than max rim width, all came from this ADR!!

If the ADR no longer exists, what is the regulation!!!

Surely someone knows, and can give a 100% answer???
How about you engineers out there?

the 15mm rule did not come from the ADR. The 15mm rule is a QLD modification guidline (and limit).

You cannot change the load rating or speed rating of the tyre/rim combination that was origonally fitted to your vehicle by the manufacturer, IE, whats written on your tyre placard, unless, you comply with your states modification guidlines.

I cant imagine ANY state is going to allow you to change the load or speed rating of your rim.

What exactly do you want to know?

tbjaus2000 wrote:I don't mean to be rude, but no one has actually cleared anything up.

ADR 24 is to guide and determine, size, speed & characteristics.... bla bla bla. All the information about 15mm bigger than orig tyre size, of wider than max rim width, all came from this ADR!!

If the ADR no longer exists, what is the regulation!!!

Surely someone knows, and can give a 100% answer???
How about you engineers out there?

The answer depends on what state you are in. About half the states have adopted the NCOP, so in those states you can use the NCOP.

In QLD, as mentioned, you need to use the modification guidelines, until/if they adopt the NCOP.

So what state are you in and what exactly do you want to do?

Apologies for not being clear.
I'm in victoria. I have a G60 patrol engineered to 33x10.5 inch tyres.

I want to know. Legally in Vic,
a) What is the max rim width,
b) tyre diameter
c) Max increase in track.

The reason i ask is because the car handles far better on 33x12.5 because of the increased track of 2".
I can't legally go to 33x12.5 and am not really fussed about 10.5 or 12.5, but what i would like to do is go 33x10.5 on 8" rims, offset to gain that track to match what the 33x12.5 track is.

Make sense?

tbjaus2000 wrote:Apologies for not being clear.
I'm in victoria. I have a G60 patrol engineered to 33x10.5 inch tyres.

I want to know. Legally in Vic,
a) What is the max rim width,
b) tyre diameter
c) Max increase in track.

The reason i ask is because the car handles far better on 33x12.5 because of the increased track of 2".
I can't legally go to 33x12.5 and am not really fussed about 10.5 or 12.5, but what i would like to do is go 33x10.5 on 8" rims, offset to gain that track to match what the 33x12.5 track is. Make sense?

You will not get the answers you are looking for off here, if you are that worried about modifications go and take your car to a real human engineer rather than relying on the comments of "experts" on a 4wd forum.

in saying that why not just put your some 12.5 inch tyres on the 8" rims?

Increasing the tyre width can increase the total width but does not increase the track width. Altering the offset/backspacing of your rims can increase or decrease your track width. Under normal situations in VIC you can increase the track width of a solid axle by up to 50mm but if your car has already been engineered for some variation then you will need to talk to an Engineer about what you may want to change.

Just put 8" rims on it. Really, worst case scenario you get a notice to fix for your rims/tyres. In all reality, who is going to check that the cert says 15X7 and your rims have 15X8 on them?

There are heaps of cars out there with 8" rims on them placarded for 5.5" rims.... like 1/2 of the worlds 40 and 70 series.

Most rims don't even have the width on the front face anyway.

IMHO, if someone really wanted to canary your car, they will find something in any case.

Just my 2C

Steve.

embryo wrote: 'as per the tyre placard on YOUR vehicle'

with out telling you where you can read it, thats about as clear as you can get.

if its engineered to run 33x10.5 then it would be engineered to run the recomended rim for a 33x10.5. when was it engineered? go back to that engineer for your answers.