ADR's and tyre size

[cbr]

Can anyone tell me for a fact that ADR's specify that you can not put larger tyres on your vehicle?? I have heard that the limit is 15mm increase. Is this in the ADR??

Looking at http://www.dotars.gov.au/transreg/str_adrindx.htm ADR 24 - Tyre & Rim Selection is no longer effective as at 01/01/2005!!

I have been approved to run 33's on my runner by the DPI here in WA. This is a pre-approval for the mod. But it also states on the pre-approval that I must meet ADR's for the year of manufacture and the rim/tyre combination must meet the Tyre And Rim Association guidelines.

So if ADR's dictate that you can not increase tyres size by more than 15mm. Then the pre-approval I have is worthless, as i still have to meet adr's

So can authorities/engineers override ADR's??

Chris.

[mickyd555]

that 15mm thing is a Queensland transport thing over here. if your state transport agency said its ok, then you should be right. i dont know of the ADR's saying anything like that. they dont really have anything to do with mods, more so the design of a vehicle. however you still need to follow them when modding.......if that makes sense

[mkpatrol]

Can anyone tell me for a fact that ADR's specify that you can not put larger tyres on your vehicle?? I have heard that the limit is 15mm increase. Is this in the ADR??

Looking at http://www.dotars.gov.au/transreg/str_adrindx.htm ADR 24 - Tyre & Rim Selection is no longer effective as at 01/01/2005!!

I have been approved to run 33's on my runner by the DPI here in WA. This is a pre-approval for the mod. But it also states on the pre-approval that I must meet ADR's for the year of manufacture and the rim/tyre combination must meet the Tyre And Rim Association guidelines.

So if ADR's dictate that you can not increase tyres size by more than 15mm. Then the pre-approval I have is worthless, as i still have to meet adr's


So can authorities/engineers override ADR's??

Chris.

ADR 24 doesnt specify tyre sises for vehicle types. It talks about rim & tyre construction & fitment combinations.

What the WA goverment is PROBABLY talking about is the tyres & rims must be of an approved type and the correct combination is fitted as per the tyre & rim manual. Once you have established that then the engineer can write a certificate saying the larger wheel & tyre combo doesnt upset the handling of the vehicle.


Yes ADR 24 has been repealed but ADR42/04 takes over where that left off & has a section on wheels & tyres.

[bogged]

Yes ADR 24 has been repealed but ADR42/04 takes over where that left off & has a section on wheels & tyres.

ADR 42/04 General Safety Requirements is released. Unitil 1 January 2005 ADR 42/04 will be treated as an alternative standard for ADRs ADRs 7/00, 15/01, 16/01, and 24/02. After 1 Jan 2005 those ADRs will not be mandatory and 42/04 will be mandatory. ADR 42/04 contains additional requirements when compared with ADR 42/03 to address some of the requirements in the displaced ADRs. Download ADR 42/04 in Adobe Acrobat PDF format.
SE Form is available.

http://rvcs-prodweb.dot.gov.au/files/4204.pdf

[mkpatrol]

Yes ADR 24 has been repealed but ADR42/04 takes over where that left off & has a section on wheels & tyres.

ADR 42/04 General Safety Requirements is released. Unitil 1 January 2005 ADR 42/04 will be treated as an alternative standard for ADRs ADRs 7/00, 15/01, 16/01, and 24/02. After 1 Jan 2005 those ADRs will not be mandatory and 42/04 will be mandatory. ADR 42/04 contains additional requirements when compared with ADR 42/03 to address some of the requirements in the displaced ADRs. Download ADR 42/04 in Adobe Acrobat PDF format.
SE Form is available.

http://rvcs-prodweb.dot.gov.au/files/4204.pdf

This is correct but what he has to be careful of is he cant just claim 42/04 for his tyres & nothing else. The engineers certificate would have to show all aspects of compliance to 42/04, not just sections of it. He is best to stick to the ADR's which apply to his model of vehicle and the local registration regulations for modified vehicles which are really only using the ADR's as a reference.

[300TDi]

Try your local transport authority. Vic Roads told me last year that width must be within plus or minus 15mm of the largest / smallest specified by the manufacturer for that vehicle, and diameter plus or minus either 25 or 30mm (can't remember which one).

[-Scott-]

The 15mm bit is part of state transport regulations, to do with changing a vehicle to something other than that which was assessed against ADRs before it first went on sale. They're conceding that a change less than 15mm is unlikely to affect the vehicle's compliance with ADRs, which is also why most states (other than Qld) ask for an engineer's assessment of the modifications - to ensure that the vehicle, in its modified state, still complies with relevant ADRs. In Qld, they just say no.

The "comply with ADRs" bit means that everything else on the vehicle must still comply i.e. suspension travel, ground clearance, guards, speedo, lights, windscreen washers and wipers, emissions, yada, yada...

Otherwise they're saying "yes, you can change it; just make sure nothing changes."

Scott