Tire Advice big or small

Never tried Toyo M/T's then?

To give you an idea KM2's weigh 23Kg per tyre compared with the Toyo's 31Kg per tyre.

The extra 7Kg's must be somewhere.

Don't quite follow you on the rim change. Isn't the law a maximum of 25mm diameter extra??, regardless of rim size it is the overall diameter that matters

gooday Kev :Can you give us a tip on why BFG are better .

In most states it's 15 mm not 25 mm. There is a tyre size calculater on this site. Mike

Tyre diameter can be 15mm larger or 26mm smallervehicle mods qld

So is my one size up from the stock size bigger then 15mm?

The tyre size calculator has a compare function. Put the 2 different sizes in and it will calculate the different diameter for you. A very handy tool. If you google tyre size calculator then the exploroz one is near the top. Mike

Sorry Kev - Tire is also english spelling.

Originally in english tire and tyre could be used interchangeably then the spelling "tyre" fell out of use for a 150 years or so in english and the term was spelt "tire".

When pneumatic "tires" were invented in the late 19th century the spelling "tyre" was introduced to indicate these type of tyres - the spelling tire remained to indicate the general term and to indicate non pneumatic tyres.

So arguable in British english and Australian english both spelling is correct. In American English only "tire"is used - which indicates tyres in all there forms - pneumatic, solid rubber, water filled, steel - whatever.

Garry

Its an ST so i think i should be ok, the spares sit up on a custom carrier above some toolboxes so problem solved :)

How obvious will the power loss be do you think? Maybe i should stick with the standard size if the cons out weigh the pros?

blown4by

I thought the 50mm tyre increase for 4wds was soon going to take affect. I didn't know it was already in use. Do you have a reference to where you have your information from? it would be good to have to be sure.

Well, I've looked up the current legislation and nowhere does it mention an increase of 50mm.

In fact it mentiones that off-road passanger vehciles can increase the tyre diameter by only 15mm. Can't get much clearer then that.

See section 44 on page 65

Transport Operations (Road Use ManagementVehicle Standards and Safety) Regulation 2010

44 Alternative tyres, rims and wheels
(1) Tyres and rims fitted to a motor vehicle that is a car, car
derivative or off-road passenger vehicle need not comply with
section 7(1) or 8(1) if—
(a) the combination of tyre and rim—
(i) has a diameter that is—
(A) not more than 15mm more than the diameter
specified by the vehicle’s manufacturer; or
(B) not more than 26mm less than the diameter
specified by the vehicle’s manufacturer; and

blown4by

I've finally found what you are referring to, and you are correct, kind of.

The National Code of Practice allows for a 50mm increase on 4wd's but, (and it says so in the preface) state legislation overides NCOP's. So I am not sure if any state actually allows it. Qld certainly doesn't.

VSB14

See point 4.2.4 on page 21
Section LS Tyres, Rims, Suspension and Steering

WA allows 50mm increase in diameter on 4WD t(not AWD) tyres and has done so since VSB14 was first introduced in January 2006 or 2007. Time flies when you are having fun. VSB14 is a National Code of Practice administered by the Feds but each State Transport authority has a representative who together put the document together and update its content from time to time to cover new developments in vehicle modifications, what is happening in industry etc. Between each new version their is a public comment/submission period where individuals and specific interest groups (4WD lobby) can have input. VSB14 specifies what modifications are legal and whether approval is required and whether that approval needs to be covered by simple mod permit or engineering approval.

That appears to be correct for WA, as there is no reference to tyre modifications in their state legislation. This is not the case in some other states.