Tyre sizes?

Thanks Mud, excellent, answers my question spot on

I tired bigger wheel on my 3L hilux just to see how it would go , I went from a 30x9.5 x15 to a 7.50x16 and it died just at the sight of the hill coming, but in saying that the 2.8 was a much better motor than the 3L pile of junk so you may be ok with yours.

The other thing I can think of is going higher in the side wall is it probably won't corner so well as it will give more "roll" in the tyres but then it all depends on where and how you want to drive it

Just my thoughs

Trevor

thanks Trev, may stick to the same size as I have

Thanks Josh, did not give that a thought. Assumed that they would be capable of handling the weight of a loaded vehicle.

Rgds

Not to mention the legality of it all. Even the 31's may not be legal, they're not in my state.

Mmmmm, did not know there were illegal in some states, like to see that one go to court.

If you're REGISTERED in Queensland, this is the regulation that applies. Don' t know about other states.

"The rim diameter may be varied from the standard size
but the overall diameter of the tyre must not vary by
more than +15mm or -26mm."

Hi Lex, now I understand, they may be big, not that they are 31".

Hi Penchy, yes the larger tyres in the Jack put the speedo out by 10% checked by several GPS's in convoy. easy once you got used to it, a bugger when you were doing night navigations though, trying to work out 13.3 km less 10%

The following is taken from Vehicle Standard (Australian Design Rule 18/03 – Instrumentation) 2006:

5.3. The speed indicated shall not be less than the true speed of the vehicle. At the
test speeds specified in paragraph 5.2.5. above, there shall be the following
relationship between the speed displayed (V1) and the true speed (V).

0 = (V1 - V2) = 0.1 V2 + 4 km/h

If you put tyres on your vehicle that put your speedo out of that range you should change the calibration of it to keep your vehicle roadworthy.

I was able to copy the correct symbols into the reply correctly but they were changed by the forum after I hit submit.

Those = symbols were supposed to be a combination of the < symbol and the = symbol meaning equal or less than. In other words 0 must be equal to or less than V1 - V2 (etc)

Also the line "relationship between the speed displayed (V1) and the true speed (V)." should read:

relationship between the speed displayed (V1) and the true speed (V2).

Geeze Pete I hope they don't check my bus, at 80kph I'm actually doing 100.

Note your sig block, I did 15 yrs in the services as a Tech