Thread: Tyre rotation pattern? Including the spare.

Originally Posted by Toxic_Avenger

Tell me more... either here or new thread.
I recall reading something about hot/cold pressures and how this helps ideal tyre pressure, but I promptly forgot.

I am sure there is a thread on here somewhere, I just cant find it. It works for me BUT I am mostly on sealed roads, AND it probably depends a bit on just what tyres you are running, amongst other things. I check them regularly before a long run and the current set of tyres are wearing evenly. I regularly get those that know more than me trying to tell me my tyres are half flat! They do look low when cold, but always come up 4 psi anywhere along the way when I check them.
The trick seems to be to establish just what the starting pressure should be.

https://www.coopertires.com.au/media...-pressures.pdf

Originally Posted by Toxic_Avenger

Tell me more... either here or new thread.
I recall reading something about hot/cold pressures and how this helps ideal tyre pressure, but I promptly forgot.

The 4psi rule is the tyre pressures should increase by 4psi from cold to hot. A "hot" tyre is a tyre that has been driven for an hour at a speed not less than 100km/h.

You measure your cold pressure before you leave, after an hour you measure your pressure, if it has risen by 4psi then your starting cold pressure was correct. If it has risen by more than 4psi, then your starting cold pressure was too low, less than 4psi then it was too high. Do not adjust the pressure of a hot tyre, it will never be accurate, always do it cold. Play with pressures until you have the magic number of 4psi change in pressure.

So vehicle weight/load being carried has a fair bit to do with it i guess?
Does the 4psi rule indicate that the tyre has the correct contact patch?

I, like a couple of others here don't bother with tyre rotation anymore and have never been a fan of diagonal changes for the reasons given.

The fact that I run 235/85's on the 130 and the spares are 750's has nothing to do with it