I thought I might be able to explain the rear wheel rule needed for street rod rego here in QLD., but I think I might just "muddy" the water here, as it is a fairly complicated deal, and best resolved by your local TAC rep before you waste time and money trying to get the look right...(Like Darrens Big offset wheels shown above!...he has floater hubs fitted, even though they are only 8" rims, the offset backspace dictates floaters.)
QLD Transport only allow the TAC to utilize the 25mm per side wider track rule anyway, bu this gets messed up by what sort of rear end, i.e. donor vehicle you start with......so pictured above is, say, a brand new 56" wide Currie style copy of a 9".....however, as it is all new everything, it's classed as "not a Ford", so the track width is its flange to flange width..(56").....but if it was a genuine Ford 8" or 9", or a variety of their Borg Warners, the track width is narrower by up to 6mm per side, as the standard Ford wheels had an offset inwards.....even worse if you started with a Commodore diff, as they had 38mm offset to the inside to start off with....in reality, it's all to do with the load the manufacturer deems that the wheel bearing will accept.
Then, just to confuse the issue, I used EA Falcon axles, as they are cheap, easy to respline to any length, but I also machined the bearing area to accept Ford 9" bearings, rather than EA bearings....so now, it is deemed to be a 9" axle, and not an EA/AU axle.
Now, throw into this mix, is the back spacing/vs rim width...just about every good looking USA type wheel that we love on hotrods doesn't fit the rear spacing requirenents, especially alloys with the thick centre...steelies would come closer as their centres might be just 3/16" think instead of the 1" or more alloy centres.
Out of sequence, but a brand ne w Quickchange that comes complete with brakes is said to have a track width of whatever the flange to flange measures( like the Currie)
Factory wheels/bearings/donor vehicle determines how the measurements work. Problems usually arise when you use a rim greater than 7" wide, below this, you're pretty safe, but with LH9 and 10 now allowing up to 10" rims, you need to do your homework, as most common US style rims may not work...and don't be fooled by what you used to run, or what the yanks run....it's dictated by Queensland Transport, and they (and the TAC) have the last say...no exceptions, unless we talk about floating hubs.....then, a different group of rules will apply!
Typical AU Falcon , even when narrowed, will need a different wheel than what you could run on these factory 9" axles pictured below. The key point here is really the different style of bearing, like this factory tapered AU type.......(this is the style I modified, by removing the retainer, seal and bearing, and machining the offset and diameter so the 9" type (pictured below) would fit.
The simple but costly solution is to fit floater hubs like Darren did, then you can run a much wider scope of wheel,...and with LH9 and 10 now only allowing max widths of 10" rims, you will need floaters for something bigger, like this 12" US Indy pictured........but take a tip from me....work out what you THINK you want to run, and get it verified by the TAC first!
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