John Brett

John is a professional engineer with 50 years experience.

John has designed and built many cars, trucks, and vehicle assembly facilities.

John has worked on design of roads, bridges, cranes, transmission towers, and buildings, and operation, maintenance and upgrade of hydro and gas turbine power stations.

John was a LVV Certifier for 13 years. John has long been a whistle-blower, expressing the view that the LVV system is dangerously deficient. John's authority was revoked in December 2012.

John rides a 1992 Yamaha FJ1200ABS, and is also a keen road and off road cyclist.

APOLOGY

“The LVVTA has brought it to my attention that statements I have made in relation to it and its employees may have been perceived as defamatory.

I sincerely regret that and apologise for any harm caused. I have taken down the statements identified by the LVVTA of concern to it.

I have strong views about the low volume vehicle certification process and intend in the future to direct my energies into the public inquiry now being held in relation to it.”

John Brett 7th October 2015

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Wheel Spacers FAQ’s

Wheel Spacers are the subject we are most common asked about.
The rules are all on the LVVTA website in the Wheels and Tyre Standard 2005-00

Adaptors

Non-Legal spacers

WHEELS MUST BE CENTRALISED ON HUB

SPACERS need to be ‘Hub Centric’ and ‘Wheel-Centric’, or a centering ring has to be made to centralise the wheel and the spacer.
This means in practice, that wheel spacers will need to be custom-made to suit the specific vehicle and wheel combination.
Also you will probably need to fit longer wheel studs to keep the required thread engagement of the nuts.

ADAPTORS are Centered on the hub by the tapered nuts hulding them onto the hub. The wheel is then Centered on the adaptor by the tapered nuts holding the wheel on.
Centering spigots for the adaptor or the wheel are not required. (See LVV Standard 2005-00)

ADAPTORS MUST BE STRONG ENOUGH NOT TO FAIL

The LVV Standard says that adaptors ‘are manufactured by someone competent and experienced in the type of work undertaken, who has the necessary equipment to carry out the manufacturing correctly’
We do not know many people in Japan, or China, and find this clause to be unhelpful.
Instead we:-

1 Do a material hardness test to determine the likely material. Most adaptors are T6 Aluminium Alloy, which has a hardness of 40 to 45 Rockwell C. We do NOT want to accidentally certify any adaptors made of soft alloy, zinc castings or shite metal!!

2 Do a simple stress calculation (using a spreadsheet template) to determine the shear stress between the bolts, and the shear under the bolt head. The adaptor should be equal in strength to the wheel studs. We find that adaptors THINNER than about 12mm are usually over-stressed.

THICKNESS
Spacers are not permitted to be more than 20 mm
Adaptors are not permitted to be more than 27 mm,
Most adaptors are to compensate for wheels with wrong offset offset, (not to effect a change in stud pattern).

WHY IT MATTERS!!
Wheels flying off can kill people (it has happened more than once)
Wheels flying off can make controlling the vehicle a tad tricky, especially since it is likely to happen under hard cornering.
People getting killed is clearly to be avoided- as is getting sent to jail for manslaughter.
THIS IS WHY ALL SPACERS AND ADAPTORS REQUIRE LVV CERTIFICATION

Failed Wheel Adaptor

Failed Wheel Adaptor

THIS IS WHY WE HAVE BEEN CHECKING THE MATERIAL COMPOSITION OF ALL ADAPTORS FOR 10 YEARS

Additional information-
Tyre and rim sizes-
The LVVTA compatibilty chart can be found here

This is based on the best information available at the time the chart was written- however a Tyre manufacturers reccomendation takes preference- so check with the tyre manufacturer if you want to use a combination outside these guidelines.

Hope this clears up any confusion, and helps you to get it right before going for your Cert.

160 comments to Wheel Spacers FAQ’s

  • johnbrett

    Hi Matt
    Now I understand. Cutting the studs off flush with the nuts will do. It will stop you fitting standard wheels (if you change back), without replacing the studs.

    Cheers

    John

  • Mathew

    Hi john thanks for that. So cutting the studs should be certable? I went to the give a little page but it looked like your one was closed??

  • johnbrett

    It did close by itself, after collecting about $1700. I started it again a couple of months ago. Perhaps you have an old page cached on your computer?

  • Hi John I have purchased some 15 mm spacers/adaptors and would like to know if I can cut the original studs back a little as they protrude a few mm past the adaptor/spacer which means I cannot get the mag to sit flush onto the hub. There’s plenty of stud for the spacer/adaptors to bolt too and the wheels will bolt onto the adaptor bolts. Am I able to trim a few mm off as its not needed?

    Many thanks

  • johnbrett

    Hi Damon
    No problem trimming the studs, it is normally done. The Adaptors WILL need Certification. If you remove the adaotors the studs might be too short.
    Good luck
    John

  • Dam lol I should have just skipped to the end of comments to begin with. Who would have thought the answer to my question would already be there. Thanks anyway for your previous reply I will be cutting my factory studs and I also meant that the mag could not sit flush with the adaptor not the hub

    Cheers

  • Colin Horgan

    Hi John I have purchased spacers for my mini from the UK mini spares. They are an OEM part, do I need certification.

  • johnbrett

    Hi Colin

    If the spacers are specified by the manufacturer for your vehicle, then they are replacement parts
    If not, they are a modification.

    The VIRM then requires LVV Certification- see:
    http://vehicleinspection.nzta.govt.nz/virms/in-service-wof-and-cof/general/tyres,-wheels-and-hubs/tyres-and-wheels

    There is no charge for this free advice, but could I ask that you make a small donation to my ‘Give-a Little’ campaign? This is to cover legal costs for defending myself from Defamation charges made by Mr Johnson of the LVVTA.
    If you did want to, just click though to the Give-a Little page.

    Cheers

    John

  • Nathan

    Hi John.

    Can I legally run alloy wheels that have been professionally widened?
    Do I need a cert for them?
    Thanks

  • johnbrett

    Hi Nathan
    I believe you DO need a Cert for modified wheels- wee the WOF guide here: http://vehicleinspection.nzta.govt.nz/virms/in-service-wof-and-cof/general/tyres,-wheels-and-hubs/tyres-and-wheels
    This modification is not excluded from needing certification

    Cheers

    John

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