Draw backs of 265/75/16

[al coholic]

How much does the gearing change? Is it good/bad?(this is what i'm worried about) - The difference was hardly noticeable to me.
How much extra fuel do you use? - Very little, I never did accurate readings with stock tyres though
How many RPM do you sit on at 100 or 110km/h? - I think my auto sits at just over 2000rpm at 100km/h (freeway) depends on the type of road of course.
Anything else? - The only downside for me as a NSW resident is 265/75's are over the allowable 15mm diameter increase, means an engineers certificate. I assume it may be similar rule for you guys

What tyres are you thinking of getting????

[sierra]

This is a really good site to use.

http://www.wheelsmaster.com/rt_specs.jsp

Your offset is p38, just put 38 in 'offset[ET]
7'' rim
Put standard figures on the left and the bigger tyre on the right.
245/70/16 265/75/16

750mm dia 804mm dia +7.2%

It's still going to read the same rpm as it did before at the same indicated speed but the speed will be 7.2% faster.
If the speedo was accurate before, which it wasn't, you will be doing 107.2kph when it reads 100kph.
When you are doing the same speed as before[real not indicated] the engine will be doing less revs, about 160rpm less around 100kph actual speed.
To compare your fuel consumption just work it out the same and then multiply the result by 0.928 to compensate for the extra 7.2% km you travelled over the odometer reading.

I thought you were only limited to 15mm dia increase if it's been raised by the max 50mm otherwise you can go 50mm???????

[daryn]

Tex, simple answer, do it

If you had auto I would be hesitant, you don't so good.

[patto]

I have a dyno run, of both 245/75/16 and 265/75/16 that was done on my truck... (auto)

You loose a little torque of the line, and the gear shifts are marginally different ( shifts a little later).. Strange as it pulled more torque through the upper revs of second gear and it then ran paralell through 3rd....

As for fuel i dont really know as my truck had been running crook for some time.....

Then there is the issue of some blokes oj here running 285's on auto's claiming great economy 10'2 and under. but my truck shot up when fitted the 265's and i though i would hate to see see what 285's will do.. still will put them on though looks much better..

And the D694's i cant fault them on and off road and i have flogged em to death over all sorts of terrain...

[Greedy]

Tex,
Mine has been affected to the stage I'm not totally convinced it was a good idea. I drive up the Crafers freeway daily and have been forced back into 4th gear where it previously sat comfortably in 5th. Fuel usage hasn't altered a great deal (0.5 ltr/100kph). Just harder to work out now the odo doesn't read correctly. Nice to have a correct speedo though. I also find it is less stable over bumps. It's a bit like it was on standard suspension but recovers a lot quicker.

[daryn]

I can see some of your points there Greedy, I timed my Tyre upgrade with putting on my DP-Chip. I have my chip and egr plate uninstalled at the moment (30,000 service tomorrow) and the thing drives like an old red dog not like its usual red rocket status.

With Chip off fuel for me is around 15.5l/100 uncorrected, so probably around 14.5, 13.5 when chip is on. The tyres do make a bigger difference without the chip but that is more I think a crap auto attached.

Patto, I wish I knew what the guys were doing to get 10.2 with 285's and an auto, my best is 10.5 on the freeway only with 265's.

[snowman]

.........The tyres do make a bigger difference without the chip but that is more I think a crap auto attached.

Patto, I wish I knew what the guys were doing to get 10.2 with 285's and an auto, my best is 10.5 on the freeway only with 265's.

My 265's were added from the beginning and apart from a small trial with Adz's standards tyres there was not too much difference. I will say the auto felt more responsive with the standard tyres and Daryn is right the auto is crap. Not totally - it seems strong (no body has had one go bang yet to my knowlege) but i am CONVINCED the software in the auto is written for a petrol motor and not the diesel.

If ANYONE knows how to mod the software on the auto please PM me.

Mileage does go up (as per my test) but the difference between standard tyres and 265 MUDDIES was only about 1ltr / 100 klms from memory. i will check my computer spreadsheet when i return to work.

i can say after about 17,000klms on the Mickey Thompson MTZ's they are bloody awesome. Not quite sure about wear but they still have plenty of tread. The noise is something you get used to but they have awesome off road grip and they have held their balance exceptionally well so far. I also can't report the steering wheel virbrations that others have complained about with larger tyres.

having said that when these wear out i am gong to buy a more road tread for the 17's and buy a set of 16" mags and get more muddies on them.

does anyone know if the LT D694 pattern are available on the 17 inch rim yet?

[snowman]

thanks Tex.

from memory i think you will be restricted to a LT tyre in any case.

i personally would use the LT as they are usually more heavily constructed.

thanks for the feedback.

[jop]

I run the D694 in 265/65/17 for daily's - impressed with the grip

[apoll]

Anything else? - The only downside for me as a NSW resident is 265/75's are over the allowable 15mm diameter increase, means an engineers certificate. I assume it may be similar rule for you guys

Hi,

I'm interested in this. I live in NSW as well but wasn't aware of this. Has everyone else in NSW running 265/75 16s got an eng cert?

Thanks.

[al coholic]

I dont.........I know about it, but i havent got a cert. Check the rta website and search for VSI 09. It has everything about wheels and tyres. Definately states only 15mm diameter increase in size.

[snowman]

Hi,

I'm interested in this. I live in NSW as well but wasn't aware of this. Has everyone else in NSW running 265/75 16s got an eng cert?

Thanks.

no i don't and i have a lift as well. not worried about the cops but insurance...hmmmm.

i think ag911 and kingtriton (now owns a paj) may have got the certs. they are wollongong based.

[sierra]

no i don't and i have a lift as well. not worried about the cops but insurance...hmmmm.

A friend rolled a 4x4 and the tow truck driver said it's a right off.
Suddenly the reality is that the assessor could arrive at 'any' time and their job is to value the vehicle, the repairs and make sure it's legal. The last point would score the highest with their employer because finding anything illegal allows them to reject the claim.
Anyway, friend has been desperate in a very short time window, to reduce an illegal lift but will the shocks and brake hoses get spotted, massive wheels too? Then you get into insurance fraud because these guys do this every day and have seen it all before.
It's easy to be blase about these things but when the shit hits the fan it's too late.

[patto]

Wasn't thelift andTyre law suspended indefinately for NSW???

[al coholic]

Yeah patto, it was. But that was different laws they wanted to bring in limiting a vehicle to a MAXIMUM 50mm lift, however it may be achieved ie Suspension, tyres, body lift, getting air over a speed bump. OK, so not the last one, but the tyre and wheel with a maximum 15mm increase in diametre laws have been around since '03.....apparently.

This is VSI 09 off the RTA website that pretty well explains it all for ya without me translating it. It includes the regs about increasing wheel track, and increasing rim widths too.

Like snowman, i'm not worried about the cops, most would not know one end of a car from another. But insurance is the reason to get an engineers cert..........even though i have told the insurance company that i have 265/75/16 tyres and alloy mags that are stated on the policy.........i think they would still have an "out" if things got messy. I actually made sure they were written on the policy because i know they are illegal.

[al coholic]

Funnily enough, i have never been able to find any existing rules or regs for NSW vehicles as far as suspension and body lifts go. Everyone always has a different opinion (i'm talking professionals in suspension shops, ARB, TJM, local mechanics etc that fit this stuff everyday) as to what is actually currently "legal" so to speak.

[sierra]

After finding out this week that the +15mm law applies here in SA I am going to stick with a 245/70/16.
So its booked in tomorrow morning for some Bridgestone D694LT

The D694LT comes in 255/70/16 and is 14mm bigger if you want to live on the edge?

[sierra]

Yeah I thought about that Sierra, but not a common size if you blow one up and have to get a replacement out bush.

You're right, it's not worth the trouble it could cause for 10mm and 14mm.
Better for economy too. Good looking tyres and should be as tough as according to the blurb. Saw $245 as a special so they aren't cheap.

[Greedy]

Yeah I thought about that Sierra, but not a common size if you blow one up and have to get a replacement out bush.

You're right, it's not worth the trouble it could cause for 10mm and 14mm.
Better for economy too. Good looking tyres and should be as tough as according to the blurb. Saw $245 as a special so they aren't cheap.

Funny you should mention that they aren't a common size. I think the SR5 has this size as standard

[maxtriton]

Does a 265/75x16 on a standard wheel fit into the spare wheel space under the tray guys?

[subi_man]

Certainly does

[maxtriton]

thanks subi will proceed to place second spare onto original spare rim!

[trouble]

Does a 265/75x16 on a standard wheel fit into the spare wheel space under the tray guys?

yep

[Homer]

By luck I found a reasonable alternative for those with 17" wheels. Possibly 16" in this size too?

275/65/17's give a 40mm increase in dia, which should be totally legal for those states with the 50mm rule (don't know which ones they are) and the spare fits fine.
5 tyre fitting dealers assured me they are fine on 7" rims (which they seem to be now they are on), and those with MN's and 7.5"s certainly no problems.

I have a 2" lift - probably sagged by now, will pull out the tape when the rain stops - and the tyres clear all round so no trimming needed even with the extra width. The test will be after full flexing off road I guess.
The tyres are still well inside the guards too so plod shouldn't be an issue.

Also they appear to be just under the "big wheel wobble" factor, which is a big plus for me. Can just slightly feel it maybe about to happen - but doesn't, so still feels more like a car than a bus.

[snowman]

By luck I found a reasonable alternative for those with 17" wheels.

275/65/17's give a 40mm lift, which should be totally legal for those states with the 50mm rule (don't know which ones they are) and the spare fits fine.

homer, i have not crunched the numbers but the 50mm you refer is a diameter rule. not radius, which is the effective lift. So if you go the full 50mm increase in diameter, it is only a 1" (25mm) lift.

The other 25mm gets tucked up under the guards, a bit like Blues luggage.

Damn i wish i was wrong though!!!