tyre pressures

[Pedro_The_Swift]

So, the van weighs around 1750-1800.
the four LT tyres are rated to 850kgs each
and max pressure is 65psi.

other than mpg is there any reason to run them hard?

I was thinking(have NO practical knowledge) around 40??

(non-load sharing independent, if that makes any difference:p)

[Chookie]

So, the van weighs around 1750-1800.
the four LT tyres are rated to 850kgs each
and max pressure is 65psi.

other than mpg is there any reason to run them hard?

I was thinking(have NO practical knowledge) around 40??

(non-load sharing independent, if that makes any difference:p)

Pedro,
I was told that regardless of the load, a minimum inflation pressure for a LT tyre is 60% of the Max PSI or around 39 PSI.
As the load goes up, the pressure needs to as well until there is no more than a 3 PSI increase from a cold to a hot tyre... nothing set in stone..

I run my single axle 800Kg camper with 50-55 PSI depending on load.

Cheers,
Chookie
'98 300Tdi Disco

[PhilipA]

I do not think that the above is correct.

Some time ago I dug up a table of pressure vs Load rating on a USA tyre site, and the LT table started at 35PSI.

All you have to determine is the load rating vs pressure of the tyres that you have on the caravan and if it is comfortably within the load rating you can run any pressure you like.

I run 30PSI on my LT Bridgestone 694s on my RRC fronts and this is well within their load rating, which is much higher than the OEM 205X16 tyres. I have done this previously with BFG ATs for 30 years and never experienced a problem of any type with the LT tyres.

I believe the table only started at 35PSI because LT tyres in the USA are usually fitted to actual light trucks not like here where we fit them for increased puncture resistance.LOL
Regards Philip A

[PhilipA]

Here is the Michelin chart for example.
These should be available for any LT tyre brand , but I would think the Michelin values would be pretty good for each load range.
www.rvtirepressure.com/assets/.../Michelin_Rv_Load_Inflation.pdf (http://www.rvtirepressure.com/assets/.../Michelin_Rv_Load_Inflation.pdf)
Regards Philip A

[PhilipA]

Whoops that doesn't work but the source page has Bridgestone , Michelin and Goodyear on it.

PressurePro Tire Pressure Monitoring System TPMS Pressure Pro (http://www.rvtirepressure.com/)

Regards Philip A

[Sharkee]

Pedro I have always run between 40 and 50 psi (generally around 42psi) in every caravan/camper trailer or trailer I've had, (and I've had a lot) that is on ones that had L/T tyres fitted and also depending how loaded up it was.From my experience doing this and advice I've received over the years. They roll better/easier, don't seem to heat up as much and the harder they are pumped the less sidewall roll/swaying I've found. Although rated to 65psi I have'nt really gone over 50psi
I've had lots of sizes, current one is a 22ft 2t tandom
My experience with them anyway!

Most of the time I drop them around 35ish psi if I''m travelling a dirt road for a substantial distance. Just saves on tyre damage/punctures