what tire pressure cooper AT3 245/70/16

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mreyeball

Active Member
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97 300 tdi disco 1,Just got new set of the above tires, not sure what psi i should run, phoned company i bought from and they said 32psi front and back but on sun visor in the disco it says front 28 psi and rear 38 psi which i am guessing is the correct pressure for the tires that came with it when it rolled off the production line!
it is used primarily on road with a few odd days green laning.
what would you clever lot recommend?
thanks
 
mreyeball said:
97 300 tdi disco 1,Just got new set of the above tires, not sure what psi i should run, phoned company i bought from and they said 32psi front and back but on sun visor in the disco it says front 28 psi and rear 38 psi which i am guessing is the correct pressure for the tires that came with it when it rolled off the production line!
it is used primarily on road with a few odd days green laning.
what would you clever lot recommend?
thanks
Click to expand...

on the side of the tyre is a info box with minimum and maximum tyre pressure. Go with what tyre maker in this case cooper says. The owners manual recommendations are for factory installed tyres, which you no longer have
 
same, i hate guessing pressures, be in my bike or cars, read the tyre wall then do it a bit under maximum for road use lower a bit more for stoggy stuff
 
Slightly different tyre but... I run my 245/75 R16 Goodyear Wrangler Duratrac's (rated at a max pressure of 80psi) at between 50 and 60psi without any problems. After towing my 3t caravan around Australia for the last couple of years on the blacktop and rugged dirt roads/tracks the tyres have performed well and have worn evenly with no evidence of extra wear in the centre.
 
I've said this before, the figure quoted on the side of the tyre is the MAXIMUM pressure, not the working pressure.
The type of tyre has very little bearing on the pressure, but the axle weights of the vehicle and loading are all important. The work to which the tyre will be subjected is also important.
None of this crap about the engine being at the front so the greater pressure should be in the front, and please no more very dangerous advice that the tyre should be inflated to the maximum given pressure shown on the side of the tyre.
As an example; the figure quoted on my current set of tyres is 50 psi, which according to Thor is the pressure I should run them at, but I inflate them to the book listing of front 30psi and rear 38psi. They aren't the tyres which the factory originally fitted, they're probably the third set of Goodyear Wranglers.
The vehicle manufacturer has done all the calculations and measurements so that they can make a recommendation regarding the correct tyre pressures for tyres fitted to their vehicles.
The only tests and measurements which the tyre manufacturers can make refer to the maximum safe working pressure, the absolute maximum pressure, the maximum speed and the maximum loading. They do not manufacture tyres for a particular vehicle nor do they quote the working criteria for any particular vehicle. They only quote for their own products.

I have never seen a warning in any owner's handbook stating that the tyre pressures shown are only for the original tyres fitted in the factory and good for no more than 20,000 miles or the first 2 years of a vehicle's life.

Think about it!
 
I used to run mine at 25 unless heavy towing, then I put rears up to 40, got better ride at 25 and even wear

Must add that I drive sedately and go slow round corners to save rubber, if you drive like a chav then up the pressure
 
Last edited:
brian47 said:
I've said this before, the figure quoted on the side of the tyre is the MAXIMUM pressure, not the working pressure.
The type of tyre has very little bearing on the pressure, but the axle weights of the vehicle and loading are all important. The work to which the tyre will be subjected is also important.
None of this crap about the engine being at the front so the greater pressure should be in the front, and please no more very dangerous advice that the tyre should be inflated to the maximum given pressure shown on the side of the tyre.
As an example; the figure quoted on my current set of tyres is 50 psi, which according to Thor is the pressure I should run them at, but I inflate them to the book listing of front 30psi and rear 38psi. They aren't the tyres which the factory originally fitted, they're probably the third set of Goodyear Wranglers.
The vehicle manufacturer has done all the calculations and measurements so that they can make a recommendation regarding the correct tyre pressures for tyres fitted to their vehicles.
The only tests and measurements which the tyre manufacturers can make refer to the maximum safe working pressure, the absolute maximum pressure, the maximum speed and the maximum loading. They do not manufacture tyres for a particular vehicle nor do they quote the working criteria for any particular vehicle. They only quote for their own products.

I have never seen a warning in any owner's handbook stating that the tyre pressures shown are only for the original tyres fitted in the factory and good for no more than 20,000 miles or the first 2 years of a vehicle's life.

Think about it!
Click to expand...

When you go to a different tyre than original equipment the factory psi in the owners manual is crap. most up grade to a better tyre (higher rating) most are LT tyres, where original was a P rated (passenger tyre) On the info box on the tyres it gives minimum and max psi rating
 
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