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PMcDermott Profile
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Date Registered: 06-2007
Location: South Sydney
TOTAL POSTS: 414
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National Code of Practice (NCOP) - Tyres, Rims, Suspension and Steering


While considering alternative tyres for my X-Trail I did a significant amount of research to ensure that my tyre choice would meet legislative requirements, and as such I would not fall afoul of the law or my insurance company in the event of an accident.

I was fortunate enough to come across the The National Code of Practive for Light Vehicle Construction and Modification

This code of practice covers a number of modifications to vehicles including modifications to tyres.

Specific details on what you can and cannot choose where it comes to a set of tyres under the code are detailed in Section LS - Tyres, Rims, Suspension and Steering

While I am not in a position to offer legal advice on this matter I am very confidence that provided your modifications are within the parameters specified in the code they will be legal throughout Australia


The Preface and Introduction to the NCOP cover the relationship between the NCOP and jurisdiction's administrative requirements in more detail and should be read by all those who wish to use the NCOP

Last edited by PMcDermott, 26/May/2008, 11:26 pm


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Paul - X-592
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26/May/2008, 9:35 pm Link to this post Send Email PM   Send Private Message
 
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Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
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Re: National Code of Practice (NCOP) - Tyres, Rims, Suspension and Steering


Paul,

Thanks for the information, but I must repeat the following which I have already posted in the tyre replacement thread to your 3rd time mention of NCOP, so everyone is clear.

This is also a very important piece of info which everyone needs to consider before venturing out and doing modifications based on what has been stated:

Certain jurisdictions will need to make changes to their administrative arrangement in order to fully implement the NCOP. Prospective constructors or modifiers should contact the jurisdiction in which a vehicle is to be registered or modified to determine the most up to date information about the business rules or transitional arrangements that may be in force.


This means that you will still need to get a ruling and the go a head from your own state traffic and road authority, regardless of what has been stated in the NCOP.

You can clearly see where a clash of interpretations could come into play...."off-road passenger vehicle or a commercial vehicle" the xtrail is a SUV and it could easily be interpreted that this ruling only applies to full time and large 4WDs only and this is exactly where your state road and traffic authority will need to provide an impartial ruling and confirmation.

You still need to get the all clear from the RTA

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26/May/2008, 10:19 pm Link to this post Send Private Message MSN Blog
 
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Date Registered: 06-2007
Location: South Sydney
TOTAL POSTS: 414
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Re: National Code of Practice (NCOP) - Tyres, Rims, Suspension and Steering


quote:

jalalski wrote:

Paul,
...so everyone is clear.

This is also a very important piece of info which everyone needs to consider before venturing out and doing modifications based on what has been stated:

Certain jurisdictions will need to make changes to their administrative arrangement in order to fully implement the NCOP. Prospective constructors or modifiers should contact the jurisdiction in which a vehicle is to be registered or modified to determine the most up to date information about the business rules or transitional arrangements that may be in force.


This means that you will still need to get a ruling and the go a head from your own state traffic and road authority, regardless of what has been stated in the NCOP.

You can clearly see where a clash of interpretations could come into play...."off-road passenger vehicle or a commercial vehicle" the xtrail is a SUV and it could easily be interpreted that this ruling only applies to full time and large 4WDs only and this is exactly where your state road and traffic authority will need to provide an impartial ruling and confirmation.

You still need to get the all clear from the RTA



Yes as you say Jalal, if in doubt contact the RTA. You should also read the preface which can be found HERE

According to the preface the code was endorced and accepted by the RTA (NSW), VIC Roads (Vic), DUS (ACT), DTEI (SA), Queensland Transport (QLD), DPI (WA), DPI (NT) and DIER (TAS) on 17 January 06 however I am currently doing some research to see what I can find from the RTA to see that we can be sure,

The statement "Certain jurisdictions will need to make changes to their administrative arrangement" is quite positive though,

I will get back with my results



 


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26/May/2008, 11:10 pm Link to this post Send Email PM   Send Private Message
 
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Date Registered: 06-2007
Location: South Sydney
TOTAL POSTS: 414
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Re: National Code of Practice (NCOP) - Tyres, Rims, Suspension and Steering


Ok guys I did some further research into this today and of note was the part Jalal pointed out as follows:

quote:

jalalski wrote:

Certain jurisdictions will need to make changes to their administrative arrangement in order to fully implement the NCOP. Prospective constructors or modifiers should contact the jurisdiction in which a vehicle is to be registered or modified to determine the most up to date information about the business rules or transitional arrangements that may be in force.







I contacted the RTA today regarding this to clarify.

The key sentence here is Certain jurisdictions will need to make changes to their administrative arrangement in order to fully implement the NCOP.

With regard to tyre sizes as I previously mentioned, currently tyre and wheel choices from the RTA are covered under
VSI 09 which states

quote:

The outside diameter of the wheel and tyre combination must be no more than 15mm over the largest diameter wheel and tyre combination specified for the vehicle and not more than 15mm below the smallest diameter wheel and tyre combination specified for the vehicle.



It goes on to say:

quote:

Wheels that exceed the diameter and width limits for minor wheel changes must be assessed by a signatory.



So the National Code of Practice says you increase the overall diameter by 50mm the RTA says 15mm but the RTA will potentially up to 50mm with assessment by a signatory.

So, back to the sentence earlier which Jalal spoted

quote:



Certain jurisdictions will need to make changes to their administrative arrangement in order to fully implement the NCOP.




The administrative arrangement which the RTA need to ammend to fully implement the NCOP is the allowance of up to 50mm without assessment.

This has not yet been done and the RTA are still using the VSI 09 from October 03.

So until such time as the RTA make the appropriate changes to their administrative agreement the rule in NSW remains that the outside diameter of the wheel and tyre combination must be no more than 15mm over the largest diameter wheel.

There is hope however. In my research I also noted that the RTA have already made changes to number of other VSI's in keeping with the NCOP but are yet to make the necessary changes to VSI 09.

So in summary it will change, but not yet 8(



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28/May/2008, 12:03 am Link to this post Send Email PM   Send Private Message
 
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Date Registered: 03-2008
Location: Thornleigh NSW
TOTAL POSTS: 21
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Re: National Code of Practice (NCOP) - Tyres, Rims, Suspension and Steering


Thanks for the research.

Sticking to this 15 mm sounds like it would limit choices for a T31 with 16" rims to standard 215/65R16, 225/65R16 or 235/60R16 or 205/70R16. It seems most H/T tyres come in these sizes, but most A/T tyres don't eg BFG, Coopers ATR, Scorpion ATR etc. Allowing 215/70R16 which is something like a 20mm increase would help for most A/T tyres and more than halve the speedo error!

Cheers

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Date Registered: 01-2008
Location: Darwin, N.T.
TOTAL POSTS: 74
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Re: National Code of Practice (NCOP) - Tyres, Rims, Suspension and Steering


I just got off the phone with the MVR (NT equivalent of the RTA) which may shed some light here.

Apparently the X-Trail qualifies as an off-road vehicle under the NCOP. The technician I talked to said if teh compliance plate has 'MC' in the top corner it's an offroad/commercial vehicle, for passenger vehicles it will say 'MV'. So if your state is compliant with the NCOP (which the NT is) then you're good for 50mm diameter larger. Good news for me, just ordered some Cooper 235/65 17s which are 48mm larger than OEM. Extra clearance should help.

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1/Aug/2008, 4:37 pm Link to this post Send Email PM   Send Private Message
 
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6006
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Re: National Code of Practice (NCOP) - Tyres, Rims, Suspension and Steering


quote:

whisk8 wrote:
Good news for me, just ordered some Cooper 235/65 17s which are 48mm larger than OEM. Extra clearance should help.



Just watch the speedo error when on the black stuff emoticon

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Date Registered: 01-2008
Location: Darwin, N.T.
TOTAL POSTS: 74
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Re: National Code of Practice (NCOP) - Tyres, Rims, Suspension and Steering


Actually I'm hopingit will be close to spot on now...it was 6kms overreading at 100...should now be maybe 1km underreading.

But yeah, I hope the tyres aren't too big. It was a bit of a dillemma as Coopers also make 235/60R17s with an increased diameter of 24mm (so clearance improvement of 12mm) but they were dearer.

We'll see - and I'll report back.

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Date Registered: 06-2008
Location: Canberra, ACT
TOTAL POSTS: 244
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Re: National Code of Practice (NCOP) - Tyres, Rims, Suspension and Steering


hi all, last week i did my rego inspectors course at the ACT RTA. i found out that for any vehicle with an "MC" category (multi purpose vehicle) on the compliance plate (not sure what T31 comes under but T30 is MC) you can go up to 50mm bigger tyres instead of just 15mm but you need a certificate from an instrument or transmission place saying your speedo has been calibrated to suit. so basically 26mm down or 15mm up with no problems at all, but 15-50mm up a certificate of calibration is needed but then your all sweet.
i asked the ACT RTA advisors and they said their pretty sure its a national rule. good news for those who want big tyres but to stay legal.

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14/May/2009, 7:04 pm Link to this post Send Email PM   Send Private Message
 
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Date Registered: 07-2009
Location: Palmerston, NT
TOTAL POSTS: 232
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Re: National Code of Practice (NCOP) - Tyres, Rims, Suspension and Steering


Any ideas where these calibrations can take place ? Nissan here in Darwin said we don't, ask MVR. Tried to ask MVR .. got lost in the phone option maze and gave up after 30mins. It'd be great to include a list of licensed certified speedometer recalibrators for around Australia. Has anyone been successful in getting recalibration done to their speedos on the forums yet ?

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