tyre pressures on road

Quote:

---

Originally Posted by the evil twin

another will choose say 44 PSI in search of that last bit of fuel economy they can get and bugger the teeth rattle.

---

Diesel at my local roadhouse is $1.43 cpl and ULP (normal) is selling for $1.46 cpl, as we speak.

I don't have much choice and I know a great dentist! lol, sort of

Quote:

---

Originally Posted by DX grunt

Diesel at my local roadhouse is $1.43 cpl and ULP (normal) is selling for $1.46 cpl, as we speak.

I don't have much choice and I know a great dentist! lol, sort of

---

Fair enough too Roscoe... and yet another advantage of cheesecutters... less rolling resistance thus better fuel economy

Quote:

---

Originally Posted by the evil twin

I run mine at manufactureres specs initially and adjust accordingly... no maker is going to tell you pressures that chew thru his tyres deliberately.. he'll be out of business in a year.

You also cannot just compare tyre pressures... there will be anything up to 15 maybe 20 PSI difference between LT and Passenger tyres, ply's, rim width, suspension etc and so some people here will be quoting apples and others oranges... some will have utes with an ally tray that skitter everywhere at 38 PSI others will have Telstra cabs with a heap of gear that need 48 PSI

The sidewall presure is also meaningless as other than a max inflation figure which is the sole reason that it is there. Remember the bloke who made the LT tyre designed and constructed it to go on Light Trucks, thats any Truck/4WD/Vehicle single/dual wheel etc etc NOT Nissan Patrols in particular... sama sama Passenger constructs.

Given a specific tyre manufacturer, type, size, rims and identical vehicle...Some people will run at say 36 PSI looking for comfort and another will choose say 44 PSI in search of that last bit of fuel economy they can get and bugger the teeth rattle.

---

Isn't the sidewall pressure the pressure that the maker is telling you.

Sorry just a little contradicting. The sidewall pressure is the manufacturers specifications. It gives you the load and pressure recommended by the manufacturer to carry that load. We can delve deeper into this and look into load and speed rating.

Ok people here is a rule you cannot ignore for tyres no matter size, wall thickness, surface use, vehicle type:

If your side wall is bulging and you inflate only to reveal sidewall rubbing, you have been running it under inflated. You may even have to change you tyre type to remove this effect, to compensate for the weight being carried by them. Eg you may have to go up to 8ply from 6ply.

Quote:

---

Originally Posted by Dhuck

Isn't the sidewall pressure the pressure that the maker is telling you.

---

No... Sorry but IMHO you are incorrect there, Cobber, because the manufacturer doesn't know what the tyre is going to be fitted too, Surf, Frontera, Rodeo, Navara, Patrol, Hummer, Dyna, Hino, Fuso...

From Hankook website- "In addition, the maximum inflation pressure for safe driving is marked on the tyre sidewall"
From Michelin website - "...on the tire side wall shows the max allowable inflation pressure."
From Cooper website- "Do not exceed the maximum pressure indicated on the tire sidewall."
From Kuhmo website - "Do not exceed the maximum inflation pressure labeled on the tire sidewall"
etc etc they are direct quotes from the Manuf (pls excuse some paraphrasing).

There are mobs (and my local Bob Jane is one of them) who told me and other family to ignore the pressure as it is just a manuf recommendation. IMHO grab your money and run do not walk to another supplier if any pimply faced d1ckhead tries to tell you that... or better still try a Warranty Claim.

However... I MUST add one disclaimer in that there could be manufacturers out there putting a recommended pressire on the sidewall BUT I haven't heard or seen it and there are a LOT of tyres I haven't had anything to do with

Quote:

---

Originally Posted by the evil twin

No... Sorry but IMHO you are incorrect there, Cobber, because the manufacturer doesn't know what the tyre is going to be fitted too, Surf, Frontera, Rodeo, Navara, Patrol, Hummer, Dyna, Hino, Fuso...

From Hankook website- "In addition, the maximum inflation pressure for safe driving is marked on the tyre sidewall"
From Michelin website - "...on the tire side wall shows the max allowable inflation pressure."
From Cooper website- "Do not exceed the maximum pressure indicated on the tire sidewall."
From Kuhmo website - "Do not exceed the maximum inflation pressure labeled on the tire sidewall"
etc etc they are direct quotes from the Manuf (pls excuse some paraphrasing).

There are mobs (and my local Bob Jane is one of them) who told me and other family to ignore the pressure as it is just a manuf recommendation. IMHO grab your money and run do not walk to another supplier if any pimply faced d1ckhead tries to tell you that... or better still try a Warranty Claim.

However... I MUST add one disclaimer in that there could be manufacturers out there putting a recommended pressire on the sidewall BUT I haven't heard or seen it and there are a LOT of tyres I haven't had anything to do with

---

Over 20 years I have had in the industry. But as your signature says.

Where the side wall of a tyre is marked "maximum inflation pressure", it is exactly that, a maximum. That does not mean you should inflate your tyres to that pressure all the time. The correct pressure is dependant on many factors, load, speed, terrain, tyre type/construction, etc etc. There is no easy answer to the question of "what pressure should I run", you need to take into account all of the factors above.

Tony

Quote:

---

Originally Posted by YNOT

Where the side wall of a tyre is marked "maximum inflation pressure", it is exactly that, a maximum. That does not mean you should inflate your tyres to that pressure all the time. The correct pressure is dependant on many factors, load, speed, terrain, tyre type/construction, etc etc. There is no easy answer to the question of "what pressure should I run", you need to take into account all of the factors above.

Tony

---

Thats what I thought the 4/6psi rule is for, but as others say don't use it as its for the older tyre types....very confused

I've never tested the 4 Psi rule so I can't really comment on it, but as a rule of thumb it's probably not too far off the mark.

Tony

I've always used it as a guide as all tyres are different and never had an issue with tyres wearing badly...I think stick with what works.