37 inch tyres on daily driver

[Guy]

absolute rubbish, you can go 1'' wider than the maufacturers widest wheel fitted in the factory. commodores come out with a 19x 8'' wheel package these days.

before calling it "absolute rubbish" .. get an engineer to say he will sign his\her name to a 8.5 inch or wider rim on a vehicle that did not come from the factory wearing them
(The BMW X5's have a 9.X inch rim on them from factory I think .. or it could be the Merc .. they all look the fawking same after a while)

[Rainbow Warrior]

I am not too sure about other brands of fourbyes, but certain variations of LandRovers were available with tyre sizes ranging from 6.oox16 which are about 29inches in diameter up to 9.00 x16 which on Michelins can be anything up to 37 inches in diameter and 10 inches wide,all on piss weak Rover diffs. If you have a Landcruiser, Patrol or Jeep you may find that these were supplied to various Military forces or Government departments with similar tyre options. Bill.

101 Landrover trucks maybe, not Defenders and Series 1,2 or 3. Then of course you've got to get one of these mythical tyre placards, though on an ex army landy they probably wouldn't know. Plenty of grey areas for them. Are the soft tops legal without a rollbar for example? What if it was a hardtop before you removed it?

[daddylonglegs]

9.00x16 tyres were fitted to landrover series 2a normal control 1ton models and forward control series 2a and 2b models. also to series 3 1ton normal control models as well as 101 forward control. All the series vehicles had the same swivel housings, hubs and spindles regardless of tyre size so 9.00x16 tyres on the correct rims can be legally fitted to any series landrover without an engineers report. LandRover 110/defenders were also built as armoured patrol cars for use mainly in Northern Ireland.
These also had standard swivel housings, hubs and spindles and were fitted with heavy bullet resistant 900x16 tyres. The engineer we have used for checking modifications accepts this size tyre without question, saying that he is not concerned whether the diffs or Halfshafts are strong enough, as long as the structural components,ie swivels, hubs and spindles etc are up to the job. Bill.

[hypo]

NJ SWB in case you thought I was in QLD I'm not- just very close, so I'm under NSW law.

Hypo, I can't help wondering about what you say- your tyres require an 8.5 inch rim- why not get wider rims? I know its not legal with Hilux diffs, but surely OK with GQ or 80 series diffs? My understanding is u r allowed up to 1 inch wider than standard rim- and both of above came with 8 inch rims I believe. Are 15 x 9 inch rims available?

i know this but from wot i have been told and been thru 8" is the maximum allowable width that can b registered even tho it came factory on certain vehicles..

absolute rubbish, you can go 1'' wider than the maufacturers widest wheel fitted in the factory. commodores come out with a 19x 8'' wheel package these days.

look im just going off wot the local engineer and even a dodgy 1 i have seen about this very topic, i am also going off wot the RTA has told me..

but if u r 100% positive of this and can prove it legally then i will stand corrected but until then i shall speak the info i have

[slosh]

The picture is becoming clearer.

Talked to engineer today and this is how I see it. In NSW, to be legal you cannot exceed the STANDARD TRACK WIDTH by more than 2 inches, no matter what engineer allows.

For example, on gen 3 Hiluxs lke hypos and mine, the standard track width (from centre to centre of tyre each side) is 1420mm (front). So max track width would be 1470mm. But my truck, running 33 x 12.5 x 15 tyres on L/C offset rims and IFS hub spacers has a track width of 1500 mm. Not legal.

But it means you can run wider than 8 inch rims (engineer had no prob with this). I think the problem is that the offset increases a lot with wider rims, and when you add wider tyres on top of that you've blown your 2 inch track width increase.

But like you said b4 hypo, 315/75 r 16 would be engineerable on a Cruiser or Patrol, because manufacturer specs down to 8" rim and with standard offset the tyre width would just sneak under 2" track increase.

Thats what I am aiming for now.

[MQ080]

How many times have we had this dicussion... are we any the wiser? I read the RTA Inspectors handbook(NSW) on this once and they stated that you could go up to 2" wider rims form the widest that came from factory. i.e. if you had a Patrol 10" here we come, BUT they make this all ambigious with the increased track/rolling diameter/etc. because they are never going to say on paper that what we do to our trucks is lawful or safe.

I vote we just grade all of the tracks and everyone put their 31's back on

[NICK]

heres one for queenslanders.



ring QLDT and ask them what the biggest rim and tyre combo is you can run on a VK commmodore. they will tell you it is a 16in rim and what ever since tyre.

You then reply, oooooooooohh ok, so why did i see a QLDT modified VK with 17in wheels? wouldnt that be illegal?

They then say, "well that is a different ball game, legally with approval you can fit the rim and tyre combo that the donor vechicle carried and in the case of our commodore it has a late VN rear diff, along with the rest of the running gear. As the VN's were fitted with a 16 we can go one size larger to a 17"

you then reply

"sweet as, cause i got a set of ford tall boy dana axles in the shed that came factory with a 38 inch tyre, i gunna wack them under me lux and run 39's. and according to you guys it will be legal and all i need to do is get a modplate for an axle swap"


now before they call you a fawking idiot and hang the phone they will try and tell you it cant be done, so it is important that you listen to what they say so you can read it back to them.

YES LEGAL, getting it approved is another story.


NICK

[slosh]

What's the point of getting an engineer's certificate if it doesn't make it registerable? I must be missing something (again... )

Just wondering.. what if you banana benders did your mods and got engineer approval- at least the vehicle would be roadworthy in 5 other states! Just get your truck across the border and drive to comps or whatever and you wouldn't get hassled by the plod.

Couldn't you..... ?

[NICK]

What's the point of getting an engineer's certificate if it doesn't make it registerable? I must be missing something (again... )

Just wondering.. what if you banana benders did your mods and got engineer approval- at least the vehicle would be roadworthy in 5 other states! Just get your truck across the border and drive to comps or whatever and you wouldn't get hassled by the plod.

Couldn't you..... ?

99% of the time officer flat foot wont know what the hell he is looking at anyway. it is transport that is the concern, and this is why most engineers wont put there names on larger tyres.


NICK

[-Scott-]

Unless you have wierd tyres which hang out one side of the rim more than the other, changing tyres on the original rim won't affect the track. Track is measured from centre to centre, so the width of the tyre is irrelevant for track measurement.

The offset of the rim is what changes the track, or spacers (if installed.)

The Queensland Transport booklet "all about modifications to motor vehicles" dated January 2000 makes no mention of rim sizes. All the references are to tyre diameter, tyre width, track and guards. Spacers between wheel and hub are forbidden, unless originally provided by the manufacturer. The only mention of offset is "All rims fitted to an axle must be of the same diameter, width and offset."

In none of the above can I find anything which would rule out 8.5" rims on a Hilux. Only the width of the tyre could be challenged; if the tyre size is OK and the rim width is appropriate for the tyre (according to the Tyre and Rim Association of Australia) then Queensland Transport can't refuse it.

Does this mean Queenslanders can do something those southerners can't?

Scott

[-Scott-]

Woo Hoo

I just checked here -> http://www.rta.nsw.gov.au/registration/ ... 9_rev4.pdf
and it definitely states, in no uncertain terms, that the maximum rim width for four wheel drives is 8 inches. At the moment, Queenslander's can run wider rims than those southerners.

Until we get these mythical National Regulations...

Scott

[slosh]

Thanks for clearing that up Scott. I knew what track width was but duh! to me for thinking tyre size affects it.

So are we going to see your Paj wear 10 inch rims with those 31 x 10.5 tyres?

Come to think pf it, what's stopping you using Pro Comp 31 x 12.5 x 15 tyres?

[-Scott-]

Thanks for clearing that up Scott. I knew what track width was but duh! to me for thinking tyre size affects it.

So are we going to see your Paj wear 10 inch rims with those 31 x 10.5 tyres?

Come to think pf it, what's stopping you using Pro Comp 31 x 12.5 x 15 tyres?

Guard clearance

The body lift is in progress (at long last ) but then I was planning to go 285/75x16 and try to avoid attention. I'm guessing I'll need 16x8" rims for that, but one step at a time!

At least running 33" tyres I shouldn't stand out as much as Patrols and Cruisers on 35" tyres.

Scott