Cooper ATR 265/75/16's LT

Submitted: Thursday, Apr 06, 2006 at 23:18
ThreadID: 32623 Views:2799 Replies:5 FollowUps:2
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What going on...?

I organised to have some new Cooper rubber a short time back..changing from my S/T's to some new ATR's.

The Cooper web site listed 265/75's in 8 ply and 10 ply. I asked for the 8 Ply.

Today I pick up the truck all done and was told no 8 ply's any more, only 10's and that's what I was given

Checked the web site and BINGO! 8 ply's no longer listed in LT 265/75/16 ATR!!!!

It drives very nicely on the smooth road but the bumps are 'noticable'. Feels like a new car again...all tight and stiff. Bit worried about getting sore bum on the corrogated roads though?

Anyone had experience with the 10 plys? they are suppose to last longer but no use to me if the car rattles to bits on the gravel roads 1st!!!

Supplier had 40 psi in them when I picked it up. I've lowered that to 35/36 (cold). Any experience out there in relation to safe pressures with the 10 ply?

I have Std suspension set up.

Cheers
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Reply By: web-keeper-666 - Friday, Apr 07, 2006 at 01:46

Friday, Apr 07, 2006 at 01:46
Good to here someone has tried these...!
I have just ordered my set for my Jackaroo.

Ok, I was told that the when used on the highway/bitsumen keep them at 38/40 psi, but when going off the highway/bitsumen, lower them to around 30/32.

This tyre pressure is purely to be used as a guage, and you show use you own judgement for the off road work you will be doing.

The down side....! you have to have your compressor handy to constantly adjust the tyre pressure.

Anyway I hope that helps a little.

Good luck
Jon
AnswerID: 165451

Reply By: bucky - Friday, Apr 07, 2006 at 05:32

Friday, Apr 07, 2006 at 05:32
Andrew
I use ATR's on my late Navara 3.0 TD. STR and love them.
Tyre pressure is a debatable point, as the Navara runs 1130 kgs on the front wheels, and 870 kg's on the rear. To get a ride that is 1/2 confortable at 32 psi front ( cold ) and 30 psi rear ( cold ) but thats unloaded highway use. Try running a Navara on 36-38 psi up the highway without a " neck brace ".
Load it up, and I use 38 all round, no questions asked
On a run up the Birdsville track I used 28 all round, loaded up, and found the ride great, and in the Simpson I used 18 psi.

Do yourself a favor,,, rotate them ( as they are non directional ) every 5000 km, criss cross them every other 5000 km, its a bit of a hastle, but you will be rewarded by a long lasting tyre.

So far I have done 45,000 km and there is heaps left on them, as wear is hardly noticable

Cheers Mate
Bucky

AnswerID: 165455

Follow Up By: Mark T - Friday, Apr 07, 2006 at 10:39

Friday, Apr 07, 2006 at 10:39
"Do yourself a favor,,, rotate them ( as they are non directional ) every 5000 km, criss cross them every other 5000 km, its a bit of a hastle, but you will be rewarded by a long lasting tyre."

I interested in this comment about criss crossing the tires which means changing direction of rotation. All though the tires are non directional, I was always told when I ran Pirellis on my Twin Cam Escort in the 70s I was always told not to change the direction of steel radials once they were in use. I was told it could lead to the tire seprarating.

Anyhow, I have Cooper ATRs and just love them.

Cheers

Mark T
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FollowupID: 420389

Follow Up By: bucky - Saturday, Apr 08, 2006 at 06:22

Saturday, Apr 08, 2006 at 06:22
Mark
The rotation is as follows, front to rear at 5,000 km, criss cross at 10,000 km, then every 5,000 km. I keep a diary, of at what km I rotate them, so I am not doubling up on any of the rotation.
As the boys from Tyrepower said " as long as criss cross rotation is done from new, there is not a problem ".
I would not contemplate a criss cross rotation on a directional tyre, although I believe ( only hearsay, and a lot of stuffing about ) it can be done, by removing them off the rims and turning them back in te right direction.


Would be interested in hearing thoughts on that one

So far I have done approx 47,000 km on them and they still look like new.Tread wear is perfect.
Cheers Mate
Bucky

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FollowupID: 420629

Reply By: Willem - Friday, Apr 07, 2006 at 06:52

Friday, Apr 07, 2006 at 06:52
I run 32psi in Cooper STT's 265/75/16 on bitumen, 28psi on long distanbce gravel roads and 25psi on tracks. Yes they are 10ply. Works for me.
AnswerID: 165457

Reply By: Member - Oldplodder (QLD) - Friday, Apr 07, 2006 at 07:58

Friday, Apr 07, 2006 at 07:58
Started off 8 years ago running 8 ply 235/85 - 16 LT coopers.
Have run firestone, toyo, simex as well.
Now generally find that only 10 ply available, so that is what I run.
Yes, are stiffer.
From memory, the 10 ply are 116/120 load rating - 1000kg at 80 psi max.
The 8 ply are 112/116 load rating - 850 kg - 60 psi max.
Varies from manufacturuer to manufacturer.

So I run the 10 plies on 36 to 40 psi empty.
Over 40 and unloaded they seem to wear the middle.
Under 32 they just roll under on the corners.
Loaded, I run 45/50 on the bitumen, 32/36 on slower tracks.

Looking at going to 265/75 16 since the 235/85 range is dropping.
Same diameter, but the wider tyre may be a problem.

By the way, same mileage within a few percent. 8 and 10 ply Coopers gave me 55,000 to 60,000. Better mileage out of the Simex, at 2/3 the cost, and almost as much grip.
AnswerID: 165480

Reply By: Vic - Friday, Apr 07, 2006 at 21:56

Friday, Apr 07, 2006 at 21:56
Agree with most of above!
I,ve put the 10 plies on a 100TD, and immediately noticed the tight ride, and better handling - less 'squishy' rear end.
At highway pressures (38-40) I notice the fillings collecting on the floor when we hit the gravel, but with a decent load, or at lower pressures, they're no worse than any other reasonable tyre.

Only done 20K since fitting, and no sign of wear, except very slight chipping.
Towed some logs up a 30 degree wet slope yesterday, and they bit like pit bulls. Much more inspiring than the GrandSlips they replaced, and when they did start to let go, it was nice and progressive.

I'm happy enough.

Vic
AnswerID: 165684

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