Tyre/Tire Pressures. What do you run? (MERGED)

A way of determining the correct pressure for on-road is that your tyres should be 4 PSI higher when hot. If less than 4 PSI then your cold pressure is too high; if greater than 4 PSI then your cold pressure is too low.
 
summer or winter 2.1 bar in city on KO2, offroad depends how much traction you need can go as low as 0.6 bar i guess.
 
Kevin said:
A way of determining the correct pressure for on-road is that your tyres should be 4 PSI higher when hot. If less than 4 PSI then your cold pressure is too high; if greater than 4 PSI then your cold pressure is too low.
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Neat! I'll give that a go.
 
Ben Up North said:
I'm working on staying on topic. kinda hard though when the last forum I was really involved with was dedicated to being off topic.

I think I'm improving.

Oh.. hang on.. what was the topic?

Ahh! I'm beginning to think I'm running my tyre pressures too high. currently about 42 psi on the road because that's what Bridgestone put them on the car at.
Thinking of dropping to 38 so it's a bit more forgiving.

Thoughts anyone?
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The correct pressure is either what is on your placard, for P-metric tires, or the calculation you can request Bridgestone to do, if you are running LT tires.

Generally, correct LT pressure is 10-12 psi higher than P pressure on the tires we tend to run. Most people run lower than ideal their LTs to preserve ride quality, basically eating into the abundant reserve available and limiting that one, sometimes by a lot.

Now, different tires won't respond identically to your standard psi. For example, my 4Runner psi is 32 but my Wildpeak are running a little underinflated at 33. This is easy to see via IR thermometer.

I guess the reason is that the Wildpeaks have a higher load capacity. But these are minor differences. 32-35 is all ok for a P-metric on either an Outback or 4Runner or Tribeca or whatever similar. But running LT at 35 means eliminating pretty much all the reserve capacity.
 
They really spec for safety above all. Ford did once spec for comfort and that did not end up very well....
 
Kevin said:
The problem with this is that manufacturers often spec for comfort rather than performance or longevity so I tend to ignore it.
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Yeah I completely ignore the tyre placard too. I've had excellent wear & grip from both the Geolandar G012 & Kumho KL71 Muddies (LT) on my Foz plus all the other cars I've owned.

The Kumhos have surprising grip for such an aggressive muddy, even on wet roads. I run them at 36psi, if I ran them any higher I probably would have had an accident by now
 
NachaLuva said:
Yeah I completely ignore the tyre placard too. I've had excellent wear & grip from both the Geolandar G012 & Kumho KL71 Muddies (LT) on my Foz plus all the other cars I've owned.

The Kumhos have surprising grip for such an aggressive muddy, even on wet roads. I run them at 36psi, if I ran them any higher I probably would have had an accident by now
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That's funny, I never realized you were running KL71--they are really distinctive. So you are saying they are a civilized, good MT? Good to know.
 
MiddleAgeSubie said:
That's funny, I never realized you were running KL71--they are really distinctive. So you are saying they are a civilized, good MT? Good to know.
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Yeah I love them, excellent tyres. Bit soft so they wear faster than other muddies but that's the trade off for the extra grip. Very aggressive tread but not too noisy

I thought the US didn't get them?
 
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