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10-13-2020, 12:19 PM
Replies: 46
Views: 1,381
Posted By jadatis

If you can give the liad on axles, or better...

If you can give the liad on axles, or better axle-ends, and maximum speed you use, and wont go over for even a minute, I can calculate a pressure for that with an even safer formula and system, then...
09-16-2020, 12:51 AM
Replies: 24
Views: 934
Posted By jadatis

Especially the ST tires list Goodyear gives is...

Especially the ST tires list Goodyear gives is calculated with the old formula for diagonal tires, of 1928. For the radial tires this gives to low pressure.
people who calc lineair, do it better...
09-14-2020, 09:52 AM
Replies: 24
Views: 934
Posted By jadatis

Boats have to be put in the water, and...

Boats have to be put in the water, and underground can be soft. Then low pressure is needed to prefent the tires digging in.
09-14-2020, 06:14 AM
Replies: 24
Views: 934
Posted By jadatis

Trailers with boats, have the advantage, that...

Trailers with boats, have the advantage, that once you know the total weight( by weighing), it stays the same during the years.
and my calculation was for radial tires, for diagonal tires it would...
09-14-2020, 04:02 AM
Replies: 24
Views: 934
Posted By jadatis

With my made traveltrailer tirepressure,...

With my made traveltrailer tirepressure, calculator, set to American, so 10% on towbar, it comes to 40 psi/ 2.8 bar. This is with maximum reserve for your 3200lbs, with 320lbs on towbar.
used...
05-23-2020, 03:09 PM
Replies: 32
Views: 1,158
Posted By jadatis

https://cimg3.ibsrv.net/gimg/www.thehulltruth.com-...

https://cimg3.ibsrv.net/gimg/www.thehulltruth.com-vbulletin/1042x462/segmentexplantiondeflection_a182ec5535ada9aeb06b1c3df3b7aa0909fd63f1.png
Explains why higher loadrange needs higher pressure for...
05-23-2020, 11:39 AM
Replies: 32
Views: 1,158
Posted By jadatis

But those lists are calculated with different...

But those lists are calculated with different formula's in Europe and America.
and no reserve is added first. So in the end, you can still end up with to low pressure.

Best is to ask me :roll....
05-19-2020, 08:19 AM
Replies: 32
Views: 1,158
Posted By jadatis

What I was pointing our to topicstarter, is that...

What I was pointing our to topicstarter, is that he could even drive constant speed of 75mph without overheating any part of tire.
And thats the goal of pressure advice, that not any part of tire...
05-18-2020, 01:27 PM
Replies: 32
Views: 1,158
Posted By jadatis

And what is your front GAWR, mostly lower then...

And what is your front GAWR, mostly lower then rear, and mostly not overloaded, as rear is often.
In my motorhome tirepressure calculator, I used here, i add only 5% to front GAWR.
so your front...
05-18-2020, 09:55 AM
Replies: 32
Views: 1,158
Posted By jadatis

Yes, 56 is OK, you are not allowed to overload...

Yes, 56 is OK, you are not allowed to overload axles, and my advice with 15% adding to the GAWR, to cover litle overloading and unbalance.
in the RV world, often rhe RV is weighed per axle, and...
05-18-2020, 06:15 AM
Replies: 32
Views: 1,158
Posted By jadatis

4800 lbs rear GAWR gives 64 psi advice , is with...

4800 lbs rear GAWR gives 64 psi advice , is with maximum reserve, with still acceptable comfort and gripp.
For 75mph and still 15% added to gawr( for little overloading or unequal load R/L gives...
05-18-2020, 03:37 AM
Replies: 32
Views: 1,158
Posted By jadatis

Dual load axle means 4 tires with rimm on 1 axle...

Dual load axle means 4 tires with rimm on 1 axle , and I think that is the same as Dually.
the Gross Axle Weight Ratings are mostly on the same plate as the pressure advices in America.
05-18-2020, 12:19 AM
Replies: 32
Views: 1,158
Posted By jadatis

Tires are 123/120 S, so max speed 180kmph/112mph,...

Tires are 123/120 S, so max speed 180kmph/112mph, but maxload single 3417lbs( LI 123) AT 80 psi ( E-load), upto 99mph, or do you have Dualload behind axle?
this would cover to law a GAWR of 6834...
05-17-2020, 01:03 PM
Replies: 32
Views: 1,158
Posted By jadatis

Apart from tmps protesting, you can probably use...

Apart from tmps protesting, you can probably use much lower pressure, especially if speed is not that high.
I am able to calculate it for you, give tire specifications and axleweigts and max speed...
08-20-2019, 03:09 AM
Replies: 15
Views: 1,255
Posted By jadatis

The dealer probably only used rules of tumb for...

The dealer probably only used rules of tumb for the pressure. And filled 50 psi. That you measured 55, then is bij higher ambiënt temp cold, and/or warm measured, and/or inacuracy of your device.
...
08-18-2019, 01:22 PM
Replies: 15
Views: 1,255
Posted By jadatis

If realy 3000lbs totalweight, so including...

If realy 3000lbs totalweight, so including pinload, if AT 65 PSI 2450 lbs advice 46 psi.
At 50 psi 2150 lbs advice 40 psi.
and assuming tires being ST ( in front of sises, stands for special...
08-18-2019, 09:16 AM
Replies: 15
Views: 1,255
Posted By jadatis

I am able to calculate it for you , with my made...

I am able to calculate it for you , with my made extra safe spreadsheet and system. Gives highest pressure wit acceptable gripp and yust no bumping.

Only need 3 things of tire, but in case of ST...
04-14-2019, 03:44 AM
Replies: 24
Views: 1,827
Posted By jadatis

need from car next: weights on seperate wheels...

need from car next:
weights on seperate wheels best, 2nd best axles, in the loading you use most, but for general idea GAWR's will do, then also give GVWR and empty weight.
And maximum speed you...
04-10-2019, 08:48 AM
Replies: 24
Views: 1,827
Posted By jadatis

Sertainly front-tires of towing vehicle dont need...

Sertainly front-tires of towing vehicle dont need that maximum pressure
pressure advice is to give the tire a deflection for the speed used, that wont overheat any part of it.
this deflection is...
11-02-2018, 02:06 PM
Replies: 9
Views: 1,141
Posted By jadatis

This sise ST tire I did not see in that 95 psi...

This sise ST tire I did not see in that 95 psi so F load.
Goodyesar stops at 80 psi, I mean to remember.
It can also be the maxcold pressure, and not the pressure behons At, some brands give them...
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