Outer Limits 4x4 Board

brendan_h wrote:sorry to hijack but i am also looking into a true 33 but need it road legal. anyone tell me what is legal and what isnt

Ryano wrote:As long as the following requirements are met and you don't increase the Overall Diameter of the tyre by more than allowed in your State, the insurance company won't have any problems with Bias Tyres on a vehicle. They will cover what is road legal.

46—Wheels and tyres—size and capacity
The wheels and tyres fitted to an axle of a vehicle must be of sufficient size and capacity to carry the part of the vehicle's gross mass transmitted to the ground through the axle.
47—Pneumatic tyres generally
A vehicle built after 1932 must be fitted with pneumatic tyres.
48—Pneumatic tyres—carcass construction
(1) A vehicle with a GVM not over 4.5 tonnes must not have pneumatic tyres of different carcass construction fitted to the same axle, but the tyres may have different cord materials and a different number of plies.
(2) However, subrule (1) does not apply to a tyre being used in an emergency as a temporary replacement for a tyre complying with the subrule.
49—Pneumatic tyres—size and capacity
The size and capacity of a pneumatic tyre to be fitted to a vehicle must be decided using a cold inflation pressure that is not more than the lesser of:
(a) the pressure recommended by the tyre manufacturer; and
(b) a pressure of:
(i) for a radial ply tyre—825 kilopascals; or
(ii) for another tyre—700 kilopascals.
50—Tyres—defects
A tyre fitted to a vehicle must be free of any apparent defect that could make the vehicle unsafe.
51—Tyres for use on vehicles with GVM over 4.5 tonnes
(1) A tyre fitted to a vehicle with a GVM over 4.5 tonnes must be suitable for road use at the lesser of:
(a) 100 kilometres an hour; and
(b) the vehicle's top speed.
(2) This rule applies to a vehicle instead of the tyre speed category requirements in the relevant ADR.
52—Tyres—manufacturer's rating
(1) This rule applies to a motor vehicle if the vehicle:
(a) has 4 or more wheels; and
(b) was built after 1972; and
(c) has a GVM not over 4.5 tonnes.
(2) However, this rule does not apply to a tyre if the tyre:
(a) is recommended by the vehicle builder as suitable for limited use on the vehicle in special circumstances at a speed less than the speed applying to the vehicle under subrule (3); or
(b) is being used in an emergency as a temporary replacement for a tyre complying with this rule.
(3) A tyre fitted to a motor vehicle must, when first manufactured, have been rated by the tyre manufacturer as suitable for road use at the lesser of:
(a) a speed of at least:
(i) for a car with special features for off road use—140 kilometres an hour; or
(ii) for another car—180 kilometres an hour; or
(iii) for another motor vehicle—120 kilometres an hour; and
(b) the vehicle's top speed.
Example—
Example for paragraph (a) (i)
A four wheel drive vehicle.
(4) This rule applies to a vehicle instead of the tyre speed category requirements in the relevant ADR.
53—Retreads
(1) A tyre that is retreaded before the commencement of this rule must not be used on a vehicle if:
(a) Australian Standard AS 1973–1976 Retreaded Pneumatic Passenger Car and Light Truck Tyreor Australian Standard AS 1973–1985 Retreaded Pneumatic Passenger and Light Truck Tyre applies to the tyre; and
(b) the tyre was retreaded after publication of the Australian Standard; and
(c) the tyre was not retreaded in accordance with Australian Standard AS 1973–1976 Retreaded Pneumatic Passenger Car and Light Truck Tyre, Australian Standard AS 1973–1985 Retreaded Pneumatic Passenger and Light Truck Tyre or Australian Standard AS 1973–1993 Pneumatic Tyres—Passenger Car, Light Truck and Truck/Bus—Retreading and Repair Processes.
(2) A tyre that is retreaded after the commencement of this rule must not be used on a vehicle if:
(a) Australian Standard AS 1973–1993 Pneumatic Tyres—Passenger Car, Light Truck and Truck/Bus—Retreading and Repair Processes applies to the tyre; and
(b) the tyre was not retreaded in accordance with the Australian Standard.
Note—
The Australian Standards mentioned in this rule require various markings on retreaded tyres. These may include a speed rating less than the rating originally marked on the tyre.
54—Tyre tread
(1) A tyre on a motor vehicle must not have cleats or other gripping devices that could damage road surfaces.
(2) Except at tread wear indicators, a tyre fitted to the vehicle must have a tread pattern at least 1.5 millimetres deep in a band that runs continuously:
(a) across:
(i) for a vehicle with a GVM over 4.5 tonnes—at least 75% of the tyre width that normally comes into contact with the road; or
(ii) for another vehicle—the tyre width that normally comes into contact with the road; and
(b) around the whole circumference of the tyre.
(3) A vehicle must not be fitted with a tyre that has been treated by recutting or regrooving the tread rubber, unless the tyre was:
(a) constructed with an extra thickness of rubber designed for recutting or regrooving; and
(b) labelled to indicate the construction.

I've just highlighted the main points that relate to the legalities of running bias tyres. This shows that a Bias tyre is legal for use under these requirements.
Mickey Thompson and Simex Bias Tyres meet these requirements. Maxxis are load and speed rated however the speed rating is not sufficient (L or 120km/h) to be road legal.

All that aside the Bias isn't designed with road handling and performance on road as a main factor. It's offroad strength and maleability over the terrain is much better though.
For on road manners, look at Radial Construction.
The Yokohama isn't a bad tyre, you will however need to rotate them very regularly as they are a little prone to uneven wear. They are also directional.

Cheers,
Ryano

joeblow wrote:don't worry about the 'tyre' being legal, 33's on zook diffs is never going to be legal anyway.............

badger wrote:Dont bother worrying about what type of tyre is legal if you want to run a 33
it doesnt exist.
i agree mtrs are great on rock and have awesome road manners. otherwise id try a silverstone or a swamper.
FWIW i recon baha claws could be out performed by the yokohama ht's i run on my 80 series for road use in 99% of qld wheeling conditions. The only thing they do average is go in straight lines in mud. and thye still dont dont do it that well compared to other tyres of the smae price.

joeblow wrote:.........silverstones..........................

mnemonix wrote:

joeblow wrote:.........silverstones..........................

Great tyres indeed, But I'd hardly recommend these for rocks.
What kind of pressure do you need to get them to bag on a zook?
I've got 33 x 10.5/15 mt117 xtremes on my zook and the amount of bagging does not vary from 40psi down to 10psi. ie: zero.
Given the reputation of this tyre for rolling off the rim, I doubt anyone is going to recommend driving it on less than 10psi.

Gwagensteve wrote:

Simexs are horrible on rock. That's if you ever get to the rock- they probably fell off the rims when you aired down.

Steve.

Gwagensteve wrote:Just my 2C. I love rock, but it's never going to be everything you drive, or we'd all be on 35 13.5 Krawlers... or highway tyres... eh Greg