maximum tyre pressure

thanks for your reply Kev

thanks Robin,
I will check the writing on my tyres.
Ian

Robin, I have never seen "at MINIMUM....psi on a tyre"
Show us a pic?

Cheers,
Peter
OKA196 Motorhome

Hi Peter

Nor do any of my current tyres.

They don't refer to max pressure either.

The actual writing on BFG is Max load at 65 psi.

However it is the clear and unambigous meaning as you can read off there inflation/load charts that minimum pressure is always required.

I don't agree Robin.
The word is AT.
AT 65psi (cold) does NOT mean MINIMUM 65psi(cold).
My inflation/load charts show lower inflation pressures for lower loads and lower speeds, but never do they indicate that the appropriate pressure (cold) for MAXIMUM load can be exceeded.

Cheers,
Peter
OKA196 Motorhome

Hi Peter

Its a straight out mathemacitcal relationship so it must.

However I appreciate that some might require more than me just saying so , so a add the following Toyo Tire note cut from the rv website which give substance to my asseration that typical use is
rated load pressure + 10

Robin


--------------------------------------------------------------------------------------
It is important to note that the inflation pressure molded on the side wall of a passenger-car tire is the maximim air pressure for that tire. That is not the case, however for light-truck tires.

The inflation pressure molded into the sidewall of light-truck tire is the minimum (that's right, the minimum) air pressure required for that tire to carry the maximum weight molded into the sidewall of that tire. Using less air pressure means the light-truck tire must carry a lighter load.

While the tire-load rating molded into the sidewall of a light-truck tire should not be exceeded, it is generally recommended that the tire be inflated to the minimum pressure required to carry the load plus an additional 5 - 10 psi. The extra pressure will help the tire run cooler. It also acts as a reserve to offset normal loss of air pressure. But the extra pressure will not add to the tire's load carrying capability. Just keep in mind that the maximum air pressure for a light-truck tire is the minimum air pressure molded into the side of the tire plus 10 psi.

So, Robin, you will use an unsubstantiated quote from an un-named RV website in the USA talking about Toyo LT tyres to detirmine what is best for your AT BFGs?

That's too long a reach for me.
Frankly no US forum has much credibility on any subject that I have noticed yet.
Why don't you ask BFG?
I will stick with what Michelin says about my size and model of Michelin tyres.

Cheers,
Peter
OKA196 Motorhome

Peter , you should know from previous posts that all mine can be substainiated , you only needed to ask.

But if your prepared to write off the US as well because they don't agree with you then there is little point in trying to explain the basic physics any further.

Thanks Geoff,
what type of shop sells the chucks and suitable hose?
rgds
Ian

Hi Ian,
I made the hose up well over 25 years ago!

I got the air chucks from a company here in Newcastle called Rema-TipTop I think they are still running in various parts of Australia, just no longer here! They were a supplier to the tyre industry.

A quick Google just turned them up! I'm impressed: Rema-TipTop

The hose came from I think Dunlop-Flexhide.

You should be able to find the air chucks these days at I'd guess either Repco or Supercheap.

The hose could be bought from someone such as Blackwoods or most any of those industrial suppliers.

Hope that helps,

Geoff

Hi Ian,

I just remembered something else, air chucks come in two types, open and closed end.

The open end is just that, open it has a pin which pushes the valve stem in the tyre to let the air in or out but it does not stop air flow when not on a tyre.

The one you require at least on the end you are going to use to inflate the road tyres is the closed end type. It has a valve that only opens and allows air to flow when it is connected to a valve stem.

The clip on chuck for the reservoir tyre end can be of either type but an open end is probably the best as it will vent your hose to atmosphere when you take it off the tyre.

I was just wandering around the Rema-TipTop site and found the chucks: Chucks etc

The one I used on the reservoir tyre end is about halfway down the page an "Air Chuck 315 Clip-on"

Hope all that helps,

Geoff

Thanks Michael,
I will go to that post now.
Ian

Hi there

How exactly do you do that ??

Do you have two valves on the "reservoir tyre".... 1 in 1 out?

I like the idea but have never thought of it.

Have however got a truck with stuck brakes ( blown air lines ) out of trouble by using the air from the spare tyre. But that was only to get it out of an intersection

Donks1

Donks, you dont need an in and out, just a tee piece, it is basically an accumulator.. See my post that i mentioned above. Michael