Trailer Tire Pressure

Anyone know the recommended tire pressure for a single axle ramlin trailer for a 206 air? Boat is on it now if that matter.

It said 22-40.. That seems very low. They are 225/75/R15 and Ramlin tells me 65psi... does that sound correct?

scottsims1 wrote: It said 22-40.. That seems very low. They are 225/75/R15 and Ramlin tells me 65psi... does that sound correct?

As Sean mentioned, it sounds like the wrong load range tire is on your trailer.

Max tire pressure is listed on the tire itself. Only in extreme cases where the capacity of the tire is waayy beyond the weight of the boat+trailer+fluids+gear will I back off the max pressure listed on the sidewall in order to achieve a softer ride. Sometimes tandems will fall into this category... Rarely will I run a single axle at anything less than max pressure. I suspect most trailer tire problems result from being under inflated... Which leads to heat and failure

scottsims1 wrote: It said 22-40.. That seems very low. They are 225/75/R15 and Ramlin tells me 65psi... does that sound correct?

RamLin puts on ST225/70 or 75D15 tires. R tires are general use passenger tires - that's the difference. ST sidewalls are trailer tires. Use the tire itself as the guide but please put trailer tires under that 206 for everyone's safety. They will trailer better, drift less and be less likely to heat up and separate the radial. Cooper, Carlisle or Goodyear make acceptable trailer tires (but that's another thread.............)

(Oops - didn't see ya' Hollywood!)

8122pbrainard wrote: Scott, Take a look at the required pressure molded into the tire itself.

scottsims1 wrote: It said 22-40.. That seems very low. They are 225/75/R15 and Ramlin tells me 65psi... does that sound correct?

scottsims1 wrote: Not on mine, and mine was a 2012 model. I could only get 55psi at the local gas station on the 225/75/17s Ds..

Scott,
Now I'm confused. Are you saying you are trying to put 65psi in a passenger tire that's only rated to a max of 40psi! Above, Steve mentioned safety! If you are trying to overinflate the tires, you are going beyond safety!

Registered to this forum because I call myself tirepressure-specialist nowadays.
story began when I got hold of the officially used formula in Europe, to calculate pressure for a sertain load on a radial tire, and went running with it.
live and was born in Holland( Europe) , and only react to tire-related questions, so dont think its usefull to introduce myself in a seperate topic, but if wanted , let me know and I will do so.

GMacLaren gives pictures and on one you can clearly see what to read
1610 lbs AT 65 psi and Loadrange D .
Thats Loadindex 97
Nice also would be the speedcode or if they are ST ( special trailer ) tires.
Especially ST is calculated in its maximum load ( that 1610 lbs) for 65m/h and this allows more maximum load then for instance a Q speedrated LT tire of same sises and AT 65 psi.
this is because of the more deflection allowed.
Goal of all calculations and maximum load determining, is to give the tire not to much heatproduction , the higher the speed the more heatproduction , and has to be compensated by lesser heatproduction a cycle, so no part of rubber gets above a temp that it hardens and crackes in next bendings.

Best is to give St tires the same deflection as an LT tire for Q speedrated ( max speed 160km/99m/h) for maximum reserve without bumping.
If then the calculation would give more then 65 psi for this D-load tire , it is allowed up to 10 psi higher, because its not the maximum cold pressure of a tire.
On Standardload( SL) and XL/reinforced/Extraload tire they only give maximum cold pressure on sidewall and AT-pressure is
SL 35psi USA and 36psi EUR Max cold between 44 and 51 psi
XL// 41 psi USA abd 42 psi EUR. Maxcold between 44 and 60 psi.

Will give text I saved from other topic on other forum to show what info I need to calculate it for you , so I dont have to write it all over again.

Tirepressure advice is all about load on tire and speed ( and sometimes about alighnment - camber angle).

So if you can give details of car and tires , I can calculate an advice pressure with some reserve for things like, pressure-loss in time, unequall loading R/L, incidental extra load, misreadings of pressure scales,and misyudging of weight, etc.

This is from tires next and can be read from sidewall:
Maximum load or loadindex.
Kind of tire to determine the AT-pressure/pressure needed for the maximum load up to maximum speed of tire, or if lower 160km/99m/h/reference-pressure, wich is not the maximum pressure of tire.
Maximum speed of tire, most given as letter ( Q=160km/99m/h,N=140km/86m/h fi)
If you have offroad or tires looking like that , with large profile blocs that cover a part of sidewall, also mention, they are allowed lesser deflection then a normal road tire, then the tire maker used to determine the maximum load (to my conclusion the case for the Bridgestone tires on Ford Explorer in the Ford/Firestone affaire).
If you cant find all of it give sises of tire and Loadkind, then I will google for it.

From car next and mostly can be found on same plate as the original pressure advices:
GAWR and GVWR ( Gross Axle/Vehicle Weight Rating)
But best would be to determine the real weights in your use on seperate tires or estimate it as acurate as possible, by weighing per wheel(pair) or axle.
Maximum speed , you dont go over for even a minute in your use, eventually different for different situations, for instance when towing or fully loaded.This apart from trafic regulations, if you drive faster then allowed give that speed. Nature punnisches with tire-failure, police only with a penalty.
Give all that and I will calculate and give a picture of one of my filled in spreadsheets in my answer.
If other then original tires, indead as is already answered other advice is needed, a stiffer tire ( fi C-load instead of P-tire) needs a higher pressure for the same load, or the other way around, has lower loadcapacity for the same pressure.

Greatings from a Dutch pigheaded self-declared tire-pressure-specialist.