Stupid tyre laws

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Originally Posted by Rosscoe68

yeah, its diameter increase only.
going from 235/70r16 to 235/85r16

falls oustide of the allowable increase in qld. even though its only 1 size up in profile.

stupid laws

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235/70r16; 235/75r16; 235/80r16; 235/85r16

Isn't that 3 sizes? The other 2 are not commonly available but are sizes.

The difference between the two 235/70r16 to 235/85r16 is

Tyre Difference Comparision
Wheel/Tyre 1 = 235 R70
Wheel/Tyre 2 = 230 R85

Results for Wheel/Tyre 1
Rolling Radius 367.7mm
Circumference 2310.33mm
Diameter 735.4mm

Results for Wheel/Tyre 2
Rolling Radius 402.95mm
Circumference 2531.81mm
Diameter 805.9mm

Differences between Wheel/Tyre 1 & 2
Rolling Radius 35.25mm
Circumference 221.48mm
Diameter 70.5mm
When speedo reads 100km/hr you're actually at 108.75 km/hr

9.6%* increase that's a lot of difference to me!


* Calculation on circumfrence = 1.095865 = 9.6% averaged up.

yeah, sorry, i abbreviated the fact that there's no commercially available between 70 and 85 series in 235. my bad, and yes i know that i am about 10% out. but i also know that my exhaust is too loud, but that didn't stop the exhaust shop charging me to have it done how i wanted it.
also know that 2" + suspension lifts are supposed to be engineered, how many do ?

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Originally Posted by Rosscoe68

<snip>also know that 2" + suspension lifts are supposed to be engineered, how many do ?

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Recently with the changed rules there were a flurry of owners having their 4WD engineered, to the extent that some engineers were gauging their invoice price.

The problem is that with newer cars the manufacturers are being very specific about the allowable tyre sizes, even to the extent of insurance companies refusing to cover damage to vehicles that have other than the original tyre pattern and size. But yes we do understand that insurance companies are in the business or taking premiums, making profits and avoiding making payments on claims.

IMHO as we progress modifications to vehicles, including tyres, without engineering certification will become increasingly difficult if not impossible.

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Originally Posted by Lotz-A-Landies

even to the extent of insurance companies refusing to cover damage to vehicles that have other than the original tyre pattern and size.

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So what happens when they stop making your particular tyre, or better yet when as happens the manufacturer buys them in bulk cheap from some offshore manufacturer (happens on the likes of certain korean mfct's) and you can't get them locally. Or just want a tyre that doesn't suckass.

Some tyre services refuse to fit oversize tyres, as they are aware that they will equally liable in the event of an accident.

Just go to another tyre place. Someone will fit them.

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Originally Posted by Slunnie

Just go to another tyre place. Someone will fit them.

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If it comes to choice between tyres & a valid insurance policy, I think I will stick with the latter!

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Originally Posted by Shaker

If it comes to choice between tyres & a valid insurance policy, I think I will stick with the latter!

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and fair enough too, but that doesn't help Rossco get his tyres fitted.

Roscoe, I've been through heaps of tyres on my D2 (2x 255/85, 2x 285/75, 1x 33x10.5, 1x 34x11.5) and I have never been questioned about the fitment of oversize tyres. Likewise at anytime the beads have been resealed etc.

heh, yeah thats it slunnie , it will pan out in the end. :)

can you imagine what an insurance company or litegation lawyer would do if they found out a tyre fitter had refused to fit your tyres and told you they were illegal and you got them fitted somewhere else anyway then had an accident even offroad:eek:. The laws may be stupid but is it worth it:(

PS I held a NSW PIA lic for over 20 years its amazing what people remember if they think they may be in trouble.