Tire pressure question - got lighter TT
Hi to all, Our TV is a 3/4 ton 9200 GVWR 4WD Burb. We had been towing a 8500 lb TT and the Burb handled it well with Load Range E tires pumped to 80 psi. With the heavy TT/tongue the Burb had a com...
Forum Discussion
Some remarks to considder.
You asume the weights on tires to be GVWR/4 and this is not the case.
Fully loaded or when towing there is more weight on the rear then on the front.
Then also as long as you dont weigh and so estimate, there is always a unequal loading R/L on the axles and often it is even crossed, so fi front R highest weight and rear L highest weight.
Not important for the pressure wich side is heavyest, you need the pressure for the highest weight on axle for both.
It is even better to determine the pressure with a sertain reserve, but to much gives a hard ride.
I determined that border ( so verry discussable) to be when the real weight on tire is below 80% of the weight the pressure is calculated for for 160km/99m/h that then things begin to tremble loose on trailer.
For persons comfort I state it at 85% Loadpercentage ( as I babtised it).
If you have a weighdivision R/L of 55/45% on the axle you can use 95% Load% for the heavyest side and 85% for the lightest side , so you still have maximum reserve without bumping.
Last is that the list given in post above is made with a formula that is worse then the normally in America used for LT, I wonder why Michelin , a from origin European brand, does use this formula and not the in Europe used formula for all kind of tires, wich leads to lower loadcapacity's for the pressure, or higher pressure for the same load.
The weight distribution Hich you have , transports a part of the towbarload from rear axle to the front axle of car and Trailer axle. This is good for better stearing and braking is also more on front tires.
But the lighter Trailer can possibly do without the WDH.
Then the weight division between the 3 axles is different, so you have to weigh again ( best per tire, second best per axle).
Once you have the weights in the configuration you use, and tiredata of car and Trailer, I am able to calculate a save lowest and highest pressure for maximum reserve with still acceptable commfort and gripp.
For that I need also the maximum speed you drive and wont go over for even a minute in your use when towing and not towing.
Greatings from a Dutch Pigheaded Selfdeclared tirepressure-specialist.
Peter
You asume the weights on tires to be GVWR/4 and this is not the case.
Fully loaded or when towing there is more weight on the rear then on the front.
Then also as long as you dont weigh and so estimate, there is always a unequal loading R/L on the axles and often it is even crossed, so fi front R highest weight and rear L highest weight.
Not important for the pressure wich side is heavyest, you need the pressure for the highest weight on axle for both.
It is even better to determine the pressure with a sertain reserve, but to much gives a hard ride.
I determined that border ( so verry discussable) to be when the real weight on tire is below 80% of the weight the pressure is calculated for for 160km/99m/h that then things begin to tremble loose on trailer.
For persons comfort I state it at 85% Loadpercentage ( as I babtised it).
If you have a weighdivision R/L of 55/45% on the axle you can use 95% Load% for the heavyest side and 85% for the lightest side , so you still have maximum reserve without bumping.
Last is that the list given in post above is made with a formula that is worse then the normally in America used for LT, I wonder why Michelin , a from origin European brand, does use this formula and not the in Europe used formula for all kind of tires, wich leads to lower loadcapacity's for the pressure, or higher pressure for the same load.
The weight distribution Hich you have , transports a part of the towbarload from rear axle to the front axle of car and Trailer axle. This is good for better stearing and braking is also more on front tires.
But the lighter Trailer can possibly do without the WDH.
Then the weight division between the 3 axles is different, so you have to weigh again ( best per tire, second best per axle).
Once you have the weights in the configuration you use, and tiredata of car and Trailer, I am able to calculate a save lowest and highest pressure for maximum reserve with still acceptable commfort and gripp.
For that I need also the maximum speed you drive and wont go over for even a minute in your use when towing and not towing.
Greatings from a Dutch Pigheaded Selfdeclared tirepressure-specialist.
Peter
