Bigger tyres legally

[TD50WA]

Hi all

Last I checked, VSB 14 limits us to a tyre size of 31". I did hear that mid last year some sort of review on cars with ESC was being done, and after that, a review of suspension and tyre sizes was happening. Since then, the info on these supposed reviews has dried up with no new info. Anyone heard of any updates?

WA is analy retentive with VSB 14, and won't consider going outside the regs, has anyone managed to get a Disco legal with bigger tyres than 31"?

Those in other states, especially those who have adopted the NCOP VSB 14, does your state give exceptions, has anyone legally fitted tyres bigger than 31" recently.....please not under old rules, only NCOP.

Cheers all
Kev

[Redback]

It's 7% of your standard size for the model, so D2s were 29" add 7% = 31.03, you can go higher, but you'll need it to be engineered, that's for NSW anyway.

Baz.

[33chinacars]

Pretty sure your allowed a total of 3" lift . In any combination. But a maximum of 2" larger in tyres + 1" lift springs . Anything more requires an engineers certificate.

[simonmelb]

Tallest is 790mm, so a 245 75 16 is sensible and popular.

Tallest in this size I can find is one of these at 781mm. http://toyotires.com.au/images/tyres/factsheet/pdf/m55.pdf

Cheers
Simon

[Hastykiwi]

Makes a mokery of the hundreds, (well maybe tens) of D2's running around with 265/75/16's. Meh.

Nick

[twr7cx]

Those in other states, especially those who have adopted the NCOP VSB 14, does your state give exceptions, has anyone legally fitted tyres bigger than 31" recently.....please not under old rules, only NCOP.

Kev, your question is pointless. NCOP VSB 14, as you well know, does not allow a D2 with standard diffs to run a tyre larger than 31" legally - engineered or not. It allows up to a 150mm lift which can be made up of 75mm suspension lift, 50mm body lift and 25mm tyre lift (which is a 50mm larger tyre).

There is one way around, the fitment of Defender diffs, would make the Defender 31" tyres the standard tyres and allow you to go up to 33" tyres. This would obviously be expensive and complicated.

NSW seems to use NCOP as the basis for it's rules but with a relaxed application and has a few State rules that replace parts including tyres - but this doesn't answer you question as it's therefore not NCOP VSB 14 being applied.

[TD50WA]

Kev, your question is pointless. NCOP VSB 14, as you well know, does not allow a D2 with standard diffs to run a tyre larger than 31" legally - engineered or not. It allows up to a 150mm lift which can be made up of 75mm suspension lift, 50mm body lift and 25mm tyre lift (which is a 50mm larger tyre).

There is one way around, the fitment of Defender diffs, would make the Defender 31" tyres the standard tyres and allow you to go up to 33" tyres. This would obviously be expensive and complicated.

NSW seems to use NCOP as the basis for it's rules but with a relaxed application and has a few State rules that replace parts including tyres - but this doesn't answer you question as it's therefore not NCOP VSB 14 being applied.

Cheers, but I don't see that it's pointless as I'm simply asking what other states do, and if anyone has any updates on the supposed review if the tyres and suspension section of vsb14.

WA will not even allow the 75mm of combined lift that other states enjoy without engineering as this is a side agreement, not part of the vsb14.

I have heard of the diff swap and even that doesn't wash over here because the tyre size is calculated on the tyre placard of the original vehicle.

It appears that the supposed National Code Of Practice is not exactly the same every where after all.....WA used to be good before as we had reasonable scope with engineering, now we can't do bugger all by comparison.

[Jazzman]

Pretty sure your allowed a total of 3" lift . In any combination. But a maximum of 2" larger in tyres + 1" lift springs . Anything more requires an engineers certificate.

This is close to Vic rules. 75mm (3in). Max of 1 (25mm) inch tire lift (which is a 2in larger tire) and 2in (50mm) max suspension lift.

Body lifts are not permitted as it is not considered a suspension modification, it is a body or chassis modification.

Be careful as the rules differ from state to state. I'm pretty sure Vic has the most legal amount of lift at 75mm or 3in as per the above combination and has a amendment to VSB14 specific to VIC.