Tyre Pressures - Cooper STs on a Patrol

[Tom0]

I've heard so many different pressures it's driving me nuts.

I have a set of 285 (33") 70r17 Cooper STs on the patrol.

What pressure should I be running on the black stuff?

[Ryano]

Have you got a drawer system loaded full time? What about a winch?

If not I'd be running 34-35 front and 32 rear. If you're running drawers I'd bump the rear up a pound or two.

Cheers,
Ryano

[ddr]

I usually run 48-50 on road most of the time.

Seems to track better, & psi increases with the weight is about 5psi.

[-Scott-]

4 psi rule. Set tyre pressure cold, check again after an hour or so of highway running. If pressure has increased about 4 psi, then your cold pressure is about right.

In my shorty Paj, 36 psi is about right in 33" STTs. I imagine you'd need more in a Patrol.

[joeblow]

I usually run 48-50 on road most of the time.

Seems to track better, & psi increases with the weight is about 5psi.

WHOLLY CRAP!...hate to have you hitting the brakes behind me!...in the wet or dry.......

[ddr]

I usually run 48-50 on road most of the time.

Seems to track better, & psi increases with the weight is about 5psi.

WHOLLY CRAP!...hate to have you hitting the brakes behind me!...in the wet or dry.......

Why?

[Nev]

I usually run 48-50 on road most of the time.

Seems to track better, & psi increases with the weight is about 5psi.

WHOLLY CRAP!...hate to have you hitting the brakes behind me!...in the wet or dry.......

Why?

Probably because he would have about 2cm of tyre touching the ground. I run 38 front and 36 rear on my 4.2 GU wagon with 265/75's.

[joeblow]

x 1000,000,000,000

[ddr]

I usually run 48-50 on road most of the time.

Seems to track better, & psi increases with the weight is about 5psi.

WHOLLY CRAP!...hate to have you hitting the brakes behind me!...in the wet or dry.......

Why?

Probably because he would have about 2cm of tyre touching the ground. I run 38 front and 36 rear on my 4.2 GU wagon with 265/75's.

LOL, so you know my truck? its day to day load?

2cm of tyre touching the road LOL.

As I said earlier I have several times run the "Pirelli" measurement of 4-6psi increase between hot & cold pressures on my Patrol & it heats up usually about 5psi. Which is exactly in the range, Ive also discussed it with experts & its all good.

Im happy that its very safe, measured properly & not overheating the tyres. Lower pressures DOES cause tyre failure due to heat, & 36 PSI causes MY ST's with the weight im carrying to overheat.

Have you ever measured properly? or just making assumptions?

[-Scott-]

LOL, so you know my truck? its day to day load?

2cm of tyre touching the road LOL.

As I said earlier I have several times run the "Pirelli" measurement of 4-6psi increase between hot & cold pressures on my Patrol & it heats up usually about 5psi. Which is exactly in the range, Ive also discussed it with experts & its all good.

Im happy that its very safe, measured properly & not overheating the tyres. Lower pressures DOES cause tyre failure due to heat, & 36 PSI causes MY ST's with the weight im carrying to overheat.

Have you ever measured properly? or just making assumptions?

Perhaps if you'd mentioned weight in your original post it may have been less controversial.

48-50 psi in a lightly loaded Patrol is too much.

On the subject of weight, how much are you carrying?

[ddr]

On the subject of weight, how much are you carrying?

Too much, shhhhhhhh.


Dont know where to get the GVM increased do you?

[-Scott-]

Yep - in Adelaide or Brisbane. Where are you?

[ddr]

Yep - in Adelaide or Brisbane. Where are you?

Vic & from looking at Bruce's failed efforts is all but impossible here.

[Tom0]

According to your votes, somewhere between 34-40 is good.
That's about what I would have thought - I'd have probably gone 36 front 38 rear without the advice herein, and that's in the middle of most people's suggestion.

I won't even START on how far to let them down (if at all) when you go bush - there's a massive can of worms there.