33's V 35's - Advantages & Disadvantages

Hi Rev

He is looking at putting a 5inch lift in

Why would you put a 5inch lift in a GU? You can run Q78x15 Swampers (36s) with 3inch lift, and no rubbing.

becasue thats what he wants to do Truckster. He will be able to answer you soon. He signed up yesterday but had to wait 24 hours before he can post and thats why I posed for him

also in Qld with a 5inch lift, you will be cop/RTA bait... the fines suck too

Hi Roachie

Can you explain a bit more about why you should change the dif ratios?
Thanks

Your gearing will become too tall.

I.E> Most sedans’ run 3.23-diff ratios turning say a 22-inch tyre, which gives good cruising speed and Ok take off. For better take off people may put in 3.73 or even 4.11 ratio but at 110 the car’s revving at say 2900 instead of 2100.

Now the patrol probably comes with something like 4.11 gears standard witch suites it well for the size tyres it’s running, so by putting on 35’s you will do the opposite to the above mentioned, as well as stressing components, forcing them to turn bigger tyres on sock diff ratios.

235/85 16 are 32".
Hope you don't mind the correction :-)
Depending on make, they are 814 to 810mm dia.

I run them too.

According to the BFG web site, the 235/85-16 is 813 dia, just over 32". It is interesting how the tyre companies come up with the specs, in particular the diameter. For example, 32in Centipedes are over 33' in diameter, according to their ads. It this simply the tread depth that gives it the extra height? If that's the case, then there are some wildly differing examples of misquoted diameters around the different manufacturers.

I guess that the point to this is the question of legality. A number of other posts in relation to tyre size quotes a 15mm increase in diameter, but after just reading the draft new laws on vehicle mods, it clearly says that 4x4's and commercial vehicles can have up to 50mm increase. Either way, is a 15 or 50 mm increase taken from the quoted tyre specs or an actual measurement? Is this a can of worms or what. Sorry to go slightly off topic here, and for what it's worth, 33's are probably the best compromise.

Andrew

Thanks for the correction.
Interesting that they are such a large 235/85 16.
That is draft legislation.
It is a can of worms not worth going into, since it is covered in other posts.
Just trying to work out a tyre to suit is enough of a headache. :-)
Good luck in your search.

I mainly went 235/85 16 10 years ago for easy replacement out west.
Can go 7.5/16 if I have too.

But by the way tyres are going at the moment, 265/75 16 seems to becoming a more common size. 32" OD too.

Hi truckster

At what point do you need a engineers certificate? when you go over what height in suspension and over what size in rubber?

You can't get it engineered in Qld. 15mm over standard diameter is max increase on tyres. It is just that we Qlders run the gauntlet an just fit them anyway.
Suspension is max 50mm increase.

As Ute said, 15mm over standard... And in Qld your fubar. The old "but everyone runs them" wont wash in a court room :-s

but if the new "NATIONAL RULES" that are being discussed at 'TOP LEVELS" are anything to go by, when they come in, you will be fine. But that has been discussed at levels since before I bought the GQ 4+ yrs ago.