Check your Coopers

[Brett1979 Avid PP Poster! Find all posts View Profile Close Brett1979]

40Psi! What does manufacturer say Toyota & Cooper to run the tyres at, seems high for everyday use? With out knowing age of the tyres it's wrong to make judgement on Cooper. I have just replaced my 7 yo Coopers as I think they are getting too old. OP says they were 3 years old when put on? We're they new, used?
Hendo66

40 psi is perfectly fine for a 4wd tyre. My Goodyear's can handle a max of 80 psi under max load. A 4wd tyre is much larger than a tyre to suit a sedan or little hatch. Those tyres are generally only kept at 28-32 psi. Plus, if you want your 4wd tyres to last longer, then keep them at 40 psi. It's also more economical with fuel usage to have them at that pressure. I've always kept mine at 38 psi. Not that it really makes a difference, I guess it's just a mental thing, but I keep them 2 psi less than 40 for a minor amount of ride improvement. Like I said, it probably doesn't make any difference whatsoever. There's also no need to deflate the tyres by a few psi before a long highway drive. That's a waste of time.

[Bear63 Senior Member Find all posts View Profile Close Bear63]

The maximum pressures and loads are written on the side of the tyre so you do need to be a bit careful as some 'OE' fitments on some 4x4's have a maximum pressures of 32psi
Generally all the decent non oe tyres are able to be pumped up 65 or 80 psi , all depending on their construction, C,D or E load rating
The pressures in you door pillar are only a recommendation as the manufacturer has no idea as to how they will be used and usually those pressure are way to low and set for comfort no wear

[hulbyw Senior Member Find all posts View Profile Close hulbyw]

I was told today by a tyre dealer who I trust that Cooper redesigned their tyres about 12 months ago and tested them in Australia, as they wanted to overcome the very poor reputation they had in Australia due to problems including delamination. So he reckons that the new designed Coopers have been trouble free (for his customers at least).

I have never owned Coopers however I may change my mind about the Bridgestone's or Yoko's that I was intending to buy for the 150. He has recommended the AT3 as I am unsure whether I could live with the much stronger but more aggressive ST Maxx (concerned the Maxx will be a bit harsher and noisier)
Cheers......Wayne

[Rainman Advanced Member Find all posts View Profile Close Rainman]

As I've always suspected, you're better off buying BFGs than Coopers. Theres never enough BFG's imported into the country to have them sitting on the shelf for 5 years.

[ntp Addicted PP Member Find all posts View Profile Close ntp]

I was told today by a tyre dealer who I trust that Cooper redesigned their tyres about 12 months ago and tested them in Australia, as they wanted to overcome the very poor reputation they had in Australia due to problems including delamination. So he reckons that the new designed Coopers have been trouble free (for his customers at least).

I guess if this new design is only 12 months old, we are unlikely to see the types of delamination, etc., that has been reported. Let's see how they last after 3-4 years.

[Fabes Member Find all posts View Profile Close Fabes]

I was told today by a tyre dealer who I trust that Cooper redesigned their tyres about 12 months ago and tested them in Australia, as they wanted to overcome the very poor reputation they had in Australia due to problems including delamination. So he reckons that the new designed Coopers have been trouble free (for his customers at least).

I have never owned Coopers however I may change my mind about the Bridgestone's or Yoko's that I was intending to buy for the 150. He has recommended the AT3 as I am unsure whether I could live with the much stronger but more aggressive ST Maxx (concerned the Maxx will be a bit harsher and noisier)
Cheers......Wayne

Ive got the ST MAXX fitted, fantastic off road as I'm sure a few could attest to from our last day out at City View 4wd Park, it is early days ive only done about 6k so time will tell. I see in your signature that you have a roof rack, I find a cant here the tires over the wind noise of the roof rack so don't let that put you off. I've had no issues in the wet either (which we have had a lot of lately) which I was a little bit concerned with given their aggressive pattern.

[Dueler120 Senior Member Find all posts View Profile Close Dueler120]

Ive got the ST MAXX fitted, fantastic off road as I'm sure a few could attest to from our last day out at City View 4wd Park, it is early days ive only done about 6k so time will tell. I see in your signature that you have a roof rack, I find a cant here the tires over the wind noise of the roof rack so don't let that put you off. I've had no issues in the wet either (which we have had a lot of lately) which I was a little bit concerned with given their aggressive pattern.

Completely agree mate.

[MDS69 Advanced Member Find all posts View Profile Close MDS69]

All this talk about Tyre pressures, OE tyres are passenger construction and most tyres like MT, BFG, Coopers etc are LT and will happily handle between 40 to 60psi

[REV Find all posts View Profile Close REV]

I was told by the dealer when having my BFG's fitted to start at 40 psi and take it from there but he recommended 40psi as I had a suspension lift and that would decrease the body roll when cornering. I have run mine at 40 psi ever since and rotate all 5 every 5000 km they wear beautifully the dealer has commented how well also.

On the occasion that I have dropped back to 36 psi, I really notice the increased body roll when cornering.

[Bear63 Senior Member Find all posts View Profile Close Bear63]

All this talk about Tyre pressures, OE tyres are passenger construction and most tyres like MT, BFG, Coopers etc are LT and will happily handle between 40 to 60psi

That's why i mentioned it as a lot of people have no idea , they think its a 4x4 tyre so they can do what they want , there was a big advertising campaign years ago for the 100 series ( i think) not to take the cars off road as the tyres were not rated for off road!!

[Dueler120 Senior Member Find all posts View Profile Close Dueler120]

Cooper tyre pressure chart indicates to run the ST Maxx between 32 - 38psi. Fair to say its all relative to what type of driving your doing eg. long distance bitumen and the weight or load capacity on the vehicle or towing. Ive found that the rears, once warm, are always at a higher psi than the fronts even when all set at a resting 'cold' temp. Obviously the weight on the back causes this and its pretty normal to witness this effect. Due to the fact that I dont travel long constant distance on the asphalt and really only take short trips on the black stuff until im down to the beach or off on an unsealed track I set mine at 32 psi cold and when warmed up they increase to around 36psi front/ 38psi rear. The 36psi mark is what Cooper recommend for unsealed smooth gravel tracks hence why I operate in this range to suit my driving conditions without having to air up and down and OCD the hell out of my tyre setup!

My question is, what is an acceptable tyre operating temperature? Tyre pressure directly relates to temperature. Of course ambient and road surface temps play a part in this and will give different rates of changes in pressure but who can tell me what is an acceptable operating range for tyres like Cooper and BFG? I see 'hot' temps of between 35 to 45*C during different driving conditions during different times in the day when im out and about. Considering people are saying heat kills tyres it would be beneficial to know when im running too hot to prevent worse case events like de-lamination or blowouts? Should we all be conscious to not only set our pressures to suit the driving surface but to also suit a temperature range once we are out of the thick stuff and back on easy driving?

Cheers,

[letsgoplaces Advanced Member Find all posts View Profile Close letsgoplaces]

The other week my tyres were running at 50 degrees, but the outside temp wouldn't have been much below that

[Bear63 Senior Member Find all posts View Profile Close Bear63]

There is no real hard and fast rule for tyre pressures as most cars are completely different for the same size tyre , i always look at the car , how its loaded ,how they drive and then look at the tyre wear so i can work it out , some of my customers run theirs at 60psi all day every day and they wear great
7 psi is the normal maximum pressure increase for what ever pressures and loads you run at , if they increase more than that they are under inflated
Never ever deflate a hot tyre thinking that it is over inflated , tyre pressures are always checked cold , the manufacturers build in a safety margin for this increase
Heats destroys tyres in a different way to the tyre in the op's picture , that is why a lot of 'so called' warranty claims are knocked back , you can tell pretty well straight away

[Mark from Brisbane Senior Member Find all posts View Profile Close Mark from Brisbane]

As I've always suspected, you're better off buying BFGs than Coopers. Theres never enough BFG's imported into the country to have them sitting on the shelf for 5 years.

Is that why they are often hard to get??

[Mark from Brisbane Senior Member Find all posts View Profile Close Mark from Brisbane]

There is no real hard and fast rule for tyre pressures as most cars are completely different for the same size tyre , i always look at the car , how its loaded ,how they drive and then look at the tyre wear so i can work it out , some of my customers run theirs at 60psi all day every day and they wear great
7 psi is the normal maximum pressure increase for what ever pressures and loads you run at , if they increase more than that they are under inflated
Never ever deflate a hot tyre thinking that it is over inflated , tyre pressures are always checked cold , the manufacturers build in a safety margin for this increase
Heats destroys tyres in a different way to the tyre in the op's picture , that is why a lot of 'so called' warranty claims are knocked back , you can tell pretty well straight away

Good information...I run my BFG's at 40 PSI for road use and getting great wear out of them, and never had an issue with a blowout. And they seem to handle my off road pressures well, I usually run about 24-26-28 on roads like the Cape, and then down to about 22 for sand (even been as low as 18 on the Simmo in 2011). Been happy with BFG but have a lot of mates who have Coopers / Micky T's and they haven;t had any drama's either, must just be the luck of the draw!!