Thread: Offset rims??? Yes or No?

Originally Posted by Crackerjack

And why, since the german TUV accepts them, arguably the toughest testing authority in the world, I have had mine on for 3 years with no probs whatsoever.

I think if that is the defenition for a tough testing authority then the RTA must be tougher and they don't do testing.

I think it comes down to "it is easier to say no than to have to take a risk by interpreting certificates, test results etc."

they are factory installed on some porsches, so that makes sense.

Originally Posted by slug_burner

I think if that is the defenition for a tough testing authority then the RTA must be tougher and they don't do testing.

I think it comes down to "it is easier to say no than to have to take a risk by interpreting certificates, test results etc."

I don't think you you have to do testing to ban something, you need to be someone who can't be bothered, or ingnorant, and banning is the easy way out, don't you agree.

Here is the RTA rule. As you can see the max track increase is 12.5MM per side. I have never seen 12.5 MM spacers. My porsche had about 1 inch spacers.

An important requirement for all replacement wheels is that the wheel track must not be increased by more than
25mm beyond the maximum specified by the vehicle manufacturer for that vehicle.
Where non original axle or suspension 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.
If you are contemplating fitting non original axle or suspension components you should seek the guidance of a

signatory as engineering certification will be required (see page 3).

If you want ot read the whole thing.
http://www.rta.nsw.gov.au/registrati...vsi09_rev4.pdf

Regard sPhilip A

Originally Posted by PhilipA

Here is the RTA rule. As you can see the max track increase is 12.5MM per side. I have never seen 12.5 MM spacers. My porsche had about 1 inch spacers.

An important requirement for all replacement wheels is that the wheel track must not be increased by more than
25mm beyond the maximum specified by the vehicle manufacturer for that vehicle.
Where non original axle or suspension 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.
If you are contemplating fitting non original axle or suspension components you should seek the guidance of a

signatory as engineering certification will be required (see page 3).

If you want ot read the whole thing.
http://www.rta.nsw.gov.au/registrati...vsi09_rev4.pdf

Regard sPhilip A

Does that mean that 12.5mm spacers could be fitted?

Originally Posted by Crackerjack

Does that mean that 12.5mm spacers could be fitted?

Nope. But when you fit 1 inch wider wheels than stock the extra 1 inch outwards on each side adds 1 inch track width in total.

Does that mean that 12.5mm spacers could be fitted?

I think you could have your standard rims moved on the centres also if you wanted to save $. AFAIK they reverse disco steel rims to achieve this due to the shape.
I do not think there is such a thing as 12.5 MM spacers anyway , as I doubt there would be enough room to countersink the original bolts, and it would be lunacy to have great long studs that went right through. No engineer would IMHO approve such a thing.
Regards Philip A

Originally Posted by PhilipA

I think you could have your standard rims moved on the centres also if you wanted to save $. AFAIK they reverse disco steel rims to achieve this due to the shape.
I do not think there is such a thing as 12.5 MM spacers anyway , as I doubt there would be enough room to countersink the original bolts, and it would be lunacy to have great long studs that went right through. No engineer would IMHO approve such a thing.
Regards Philip A

Thanks Phillip, it was more of a theory point than anything, the nuts only just fit in mine and they are 30mm wide.