Right Pressure for new Cooper ATR 285/75R16

Submitted: Monday, Mar 28, 2005 at 18:57
ThreadID: 21555 Views:2968 Replies:5 FollowUps:2
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Just fitted the new Cooper ATR tyres to my LC 100. Hva e not been off the black stuf yet planing a trip to Yerranderie next weekend. Any info on approp pressure for rock and clay surfaces????? Running 35PSI on road. They are great in the wet.
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Reply By: Diamond (Vic) - Monday, Mar 28, 2005 at 20:23

Monday, Mar 28, 2005 at 20:23
35 seems a bit high unless it carries a load.
as a rule when i was in the tyre game the bigger the tyre the less the air.
285 is from memery(whats left)around the same as 33 x 15.
i used to run them around 28-30 psi.
as for off road i usually set any tyre around 18-20 psi for rock/clay.
AnswerID: 104052

Reply By: V8Diesel - Monday, Mar 28, 2005 at 22:29

Monday, Mar 28, 2005 at 22:29
I'd be very interested in the responses to this question too. I've just fitted Cooper ATR's in 305/70/16 to my GU and am still experimenting with tyre pressures. The Tyrepower bloke said the bigger the tyre, the lower the pressure you can run on the road. I've always run my 285's at 36psi & 40psi (fair bit of gear in the back) on the blacktop, but am now at 33psi & 35psi cold. Being an old 4x4 'rag' tyre veteran for off-road usage, these pressures seem way too low and the sidewalls flex too much for my liking, but maybe I need a rethink.

BTW the ATR's are sensational on the road. Whisper quiet (did a direct comaprison with a set of new Cooper Highway Terrains and noise wise, the ATR's are 10 times better - go figure!) and the road holding is staggering. I can have the missus hanging off the grab rails on the Freeway on-ramp. Planning a Dwellingup to Collie trip in the next few weeks which will hopefully give an indication if the ATR's are worth the dough in the dirt.
AnswerID: 104072

Follow Up By: Member - Hugh (WA) - Tuesday, Mar 29, 2005 at 14:37

Tuesday, Mar 29, 2005 at 14:37
Howdy V8Diesel,

Did fitting the new tyres finally resolve the front end wobble you were suffering?

FollowupID: 361629

Follow Up By: V8Diesel - Tuesday, Mar 29, 2005 at 14:52

Tuesday, Mar 29, 2005 at 14:52
It's 98.5% fixed now Hugh, I've got a couple more things to try and then I'll post a follow up on the whole GU wobble saga.
FollowupID: 361632

Reply By: Gossy - Tuesday, Mar 29, 2005 at 11:16

Tuesday, Mar 29, 2005 at 11:16
I have ST's and ST-C so I am a bit of a cooper fan myself. Yes I agree that 35psi is a bit too high. I have just come back from Easter and noticed within minutes that I was having a rough ride (wife trying to sleep for the upcoming night shift). Tyres had gone up in pressure from the heat. Lowered to 30psi and it was very smooth and took all the bumps out.
Did some 4wding on quite rocky ground in the southern flinder and I ran 25 psi. Could have gone lower but I had a bit of a drive to get back to town on the blacktop so didn't want to go much lower. This is a good pressure though for the tyres to 'roll' over the rocks with good give without the worry of the tyre coming off the rim. 22 - 25 psi would be fine.
AnswerID: 104111

Reply By: Moose - Tuesday, Mar 29, 2005 at 13:34

Tuesday, Mar 29, 2005 at 13:34
32psi appears to be the norm on road - that's what the tyre mob I get my Coopers from always put in. However I do increase that if I'm loaded up. Search for the 4 psi trick which has been discussed in here in the past.
Off road start with about 25 psi and if that's still too hard go down a bit more. Really depends on the terrain and load but for Yerranderie 25 fully loaded should be OK. If empty could go lower. Pump back up before doing any high speed driving on blacktop. Y is a great spot - you'll love it.
AnswerID: 104125

Reply By: boogum - Wednesday, Mar 30, 2005 at 11:55

Wednesday, Mar 30, 2005 at 11:55
Have purchased new LC 100 TD and after seeing your post asked local tyreman about fitting same to my vehicle. He says won't fit unless vehicle has been lifted. He fitted set to another LC and owner found when loaded the tyres would scrape. Any clues for me. Thanks.
AnswerID: 104306

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