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12 inch rims

 
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Franky
200rpm



Joined: 18 Jun 2021
Posts: 296
Location: Darwin

Posted: Tue Jul 06, 2020 6:15 pm    Post subject: 12 inch rims

Everyone/most states have signed off on National guidelines stating a 10 inch rim is the max......... I'm currently runnin 15x6, 15x12's which has full N.T rego.
If/when moving down south will this be a problem......also if ROKNROD goes on the market
Do other states have excemptions......

Choco- hows ACT as I copped heaps from your locals over Summer Nats.
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AutoCOL
Just Idling



Joined: 12 Jun 2021
Posts: 121
Location: Melbourne

Posted: Wed Jul 07, 2020 12:37 am    Post subject:

Quote:
Choco- hows ACT as I copped heaps from your locals over Summer Nats.



i think most of your problem was caused by the last two words in your sentence, rather than the car you were driving...


but i'm not from canberra, so...
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choco
1000RPM



Joined: 11 Jun 2021
Posts: 1016
Location: Queanbeyan, NSW (on the ACT border)

Posted: Wed Jul 07, 2020 8:35 am    Post subject:

You have to get an engineer's certificate for stuff that falls outside of the guidelines. There are several cars around this area that have big tubs that were engineered without too many problems. Most jurisdictions frown upon rooly big bags because they aquaplane so easily, however, the onus is on the driver to drive the car accordingly, and this is why it has not been outlawed (yet).
During the Summernats, most rodders in this area lock their cars up. It's just not worth it. The Magenta Gestapo (RTA) will slap a canary on anything they like. Hot Rods get targetted for no bonnets, because Street Machines are illegal without a bonnet (in a mono construction vehicle, the bonnet contributes to structural integrity, that's why Hot Rods can run legally without a bonnet) and all cars at the Summernats, in the eyes of the MG, are the same. Having said that, it is not surprising, as there are large numbers of wankers that do all kinds of crazy things. The Police are kept busy arresting these dickheads, and the MG do their best to keep all modified car owners on their toes.
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JIMBOB
500RPM



Joined: 11 May 2021
Posts: 516
Location: Canberra

Posted: Wed Jul 07, 2020 2:08 pm    Post subject: 12" rims

Franky, I'm in the ACT and have had no dramas with either the MG as chocco calls them or the police, and use an engineer that is thorough yet sympathetic to the cause. But I don't do much driving around my home town during the Summernats. Unfortunatly it attracts all the dickheads, mostly street machiners and associated wannabe's and will therefore attract the law enforcers. Oh yeah, and 12"'s is ok if engineer approved.
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toprodz
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Joined: 23 Mar 2021
Posts: 34
Location: Roxburgh Park Melbourne

Posted: Wed Jul 07, 2020 5:46 pm    Post subject:

hey guys i just thought i would throw another twist on the subject, i know that here in victoria that when we did a couple of modified 9"diffs for street machines with 10" or wider rims the engineer wanted them to have full full floating hubs other wise they wouldn't be approved

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JIMBOB
500RPM



Joined: 11 May 2021
Posts: 516
Location: Canberra

Posted: Wed Jul 07, 2020 5:55 pm    Post subject: 12" wheels

A mate of mine does 9" conversions here (M&A; Enginering) and I think it is dependant on wheel offset?

Cheers and beers
Jimbob
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Franky
200rpm



Joined: 18 Jun 2021
Posts: 296
Location: Darwin

Posted: Wed Jul 07, 2020 7:09 pm    Post subject:

my narrow 9" was approved seeing it came from a F100 weighing shitloads, going into light car, with 5 1/2" backspacing on a 12" rim almost equal loading on the bearings, ....... Thanks guys
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Mr Cool
1000RPM



Joined: 27 Sep 2020
Posts: 1180
Location: Bacchus Marsh, Vic

Posted: Wed Aug 04, 2020 4:19 pm    Post subject:

toprodz wrote:
hey guys i just thought i would throw another twist on the subject, i know that here in victoria that when we did a couple of modified 9"diffs for street machines with 10" or wider rims the engineer wanted them to have full floating hubs other wise they wouldn't be approved

Toprodz icon_peelout.gif

Full floating is not required with 10in rims on a 9in diff if the centre of the rim is directly in line with the wheel bearing, which is achieved with positive backspacing. This assumes you are using the original ford axles and bearings and doesn't create any additional load to the bearing. However if using holden axles and tubes (common conversion) max width is 8inches due to smaller wheel bearing.
As far as Im aware, this is common practice and an engineers report is not required, as testing has already been carried out and accepted by vicroads.
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32coupe
Just Idling



Joined: 04 Aug 2020
Posts: 177
Location: Canberra

Posted: Thu Aug 05, 2020 11:57 am    Post subject:

Hi Franky
I just rego'd a rod using the new scheme, and tried to get through with 11" rims, the engineer was willing to pass it if the track differance front to rear was less than 75mm. And this was in Canberra.
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GBS
200rpm



Joined: 18 May 2021
Posts: 214
Location: Central Coast NSW

Posted: Sun Aug 08, 2020 9:01 pm    Post subject:

With all of the problems we are having with rego, safety etc. these days, do we really need 12 rims on a street car?

Years ago there was a story on rim widths in one of the local street rod magazines. The report included a photo of a T bucket that had snapped the flange off a 9 inch axle because of the size of the wheels. It said vehicle weight has little to do with it and even a feather weight T is not immune to the problem.

The F100 9 inch mentioned in this post most likely came from the factory with a 15 x 6 wheel with a back spacing of around 90 mm. That gives about 62 mm outside the axle flange. A 12 inch with a 5.5 inch backspacing will have around 165 mm outside the flange and about 45 more on the inside. That is a hell of a lot of extra leverage being applied to the flange from both directions.

We have all seen a dual wheel truck parked on uneven ground with one of the dual tyres clear of the ground. A similar thing is happening to each side of a car tyre as it rolls along the road. The wider the tyre the more stress on the axle flange. This is not a problem with a custom built axle but how many rodders know exactly what the design limits of a stock axle and are they exceeding those limits?

If one of these wheels does brake an axle and causes a spectacular accident, the media will have it on page one and rod registration will be set back decades.

Has anyone ever paid any attention to what the professional US builders do when building a car that will see a lot of street use. You don't see 12 or even 10 inch wheels and there is not a lot of difference in widths between the front and rear.

Brian
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Franky
200rpm



Joined: 18 Jun 2021
Posts: 296
Location: Darwin

Posted: Mon Aug 09, 2020 7:13 pm    Post subject:

As for 10-12" rims each to there own...........
I have done over 18 000K's with tubbed rear set up, including the part DIRT road from Mt Isa to the N.T. border which is a bloody disgusting federal highway, with no dramas. Rod has been driven through TROPICAL MONSOON rain with detroit locker and admittedly the handling is a little worse than normal. But hey its nothing like the mild southern down pours.... If you drive to the conditions then wide rubber is no problem. Try gettin a decent 1/4 time with 8" street tyres .............. Porsche, Lambo's etc all have 10-12" rims from factory, Can't be too bad.

Just my thoughts/opinion.
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bcal
900RPM



Joined: 04 Feb 2021
Posts: 917
Location: The Shire, Sydney

Posted: Mon Aug 09, 2020 8:37 pm    Post subject:

Franky,
Here in the “Premier” state the maximum rim width for a modified vehicle on full rego is 10 inches. Minimum front rear ratio is 70% for full rego and 60% for club rego.
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GBS
200rpm



Joined: 18 May 2021
Posts: 214
Location: Central Coast NSW

Posted: Mon Aug 09, 2020 9:07 pm    Post subject:

Franky

It is great to hear you have done 18,000ks in your rod without any problems but are you sure an axle flange will not snap off during the next kilometre, the next thousand or perhaps the next ten thousand? Have you X rayed the axles recently or can you tell the flanges are not slowly work hardening by looking at them?

I started in rodding 43 years ago and over a period that long, one can’t help but see, hear and read about a hell of a lot of rodding disasters and tragedies and oversize wheels on stock axles have been the cause of far too many of them.

Brian
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