In NSW, the RTA http://www.rta.nsw.gov.au/manuals/registration/lvm/lvmfrm.htm suggest
that (rule 3.8.3)
For a minor modification (owner certified), the overall diameter of the alternative wheel and tyre must not be greater than 15mm over the largest diameter wheel and tyre specified for the vehicle and shall not be more than 15mm below the smallest diameter wheel and tyre specified for the vehicle.
This indicates that as long as you keep within 15
mm of the overall diameter of the tyre and wheel, you can go up rim size as long
as you come down profile on the tyre, to maintain the overall
diameter.
You can go outside these limits, provided they fall
within certain limits and are certified by an authorised engineering
signatory.
This bit is of particular interest though, and
might be an avenue of investigation : Rule 3.8.5.
Where the original axle components for the vehicle are retained, the wheel track must not be increased by more than 25mm beyond the maximum specified by the vehicle manufacturer for the particular model. Where non original axle or suspension crossmember components are fitted, the offset of the wheel in relation to the axle or stub axle assembly used shall not be increased by more than 12.5mm each side of the vehicle based on the specifications of the axle components used. If an axle assembly is shortened then the track width limit is taken as the axle manufacturers original track dimension, less the amount the assembly has been narrowed, plus 25mm;
I've highlighted the point of
interest above: This suggests to me that say, for example, you are
using 200b/bluebird/240k/whatever struts, you can increase the offset by
not more that 12.5mm each side of the "vehicle based on the specs of the
axle components". ie. If those 'axle components' came from a
vehicle with a wider track anyhow, then this is the basis of the track of your
new vehicle with those parts fitted.
I dunno the track for the various different Dattos,
but this might help you out.
Cheers,
Wardy
----- Original Message -----
From: "Terry & Heather" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, July 12, 2000 11:01
PM
Subject: RE: 300ZX Brakes and wheel
track
>
> My track is spot on 52.5" and the ACT transport dept don't care whether a
> 510 is a SSS or not but any wider and you're failed though. Funny thing is
> that mine was never measured in it's life that I know of until I applied to
> get the front brake upgrade passed.
>
> Wow, a 53.75" track must look wild on a 510.
>
> terry
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of Mick Ralph
> Sent: Wednesday, 12 July 2000 10:21 PM
> To: [EMAIL PROTECTED]
> Subject: Re: 300ZX Brakes and wheel track
>
>
> be very careful about offsets on your wheels.. I have been looking into this
> and it seems that most dattos with aftermarket wheels are illegal in this
> regard
> The rules are
> 2" (50mm) is the max increase in diameter so 15" is max
> 1" (25mm) is max for track increase.. this is measured from the middle of
> the tyre tread on each side
> i would be very interested to know what people on the list are running in
> the way of track
> 51.5" is max for a 510 sedan and 52.5" is max for 510 SSS
> my 15" x 8.5" is about 53.75" and the transport dept will not budge and give
> me approval (bastards)
> cheers
> mick
> ----- Original Message -----
> From: David Andrews <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Tuesday, July 11, 2000 5:11 PM
> Subject: Re: 300ZX Brakes
>
>
> > Erroll,
> >
> > Ok.. I sort of understand that.. so I'm guessing that that limits the mags
> > I can use on it.. i guess that simmons OM's are ok (as thats what Jeff
> > Shoesmith used)?.. does anybody know or could guess if the Simmons F9R's
> > are ok.. or ROH Astrons?.. sorry to be a pain but i'd like to know before
> > hand to weigh up if its worth it or not.
> > Also.. What kind of handbrake does the 300ZX have.. hydralic & cable?..
> > does anyone know the extent of modifications required to fit these?
> > Thanks again,
> >
> > Dave
> >
> >
>
>
>
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