What should the PSI be in the trailer?
I have a trailer which has Sailun G rated tires. The maximum PSI of air is listed as 110 PSI. I was carrying 90 PSI but recently was told that the maximum PSI, that is 110 PSI is the amount of air I ...
Forum Discussion
JIMNLIN wrote:
The OP sig shows a 3270 Big Horn trailer.
Big Horn shows a 15500 gvwr with tandem 7k axles. At full axle load is 3500 lb load per tire.
The OEM tires show to be LT235/85-16 G which is 3750 lb at 110 psi.
The same size Sailun S637 ST235/85-16 G has a 4400 lb load capacity at 110 psi.
Industry experts including Goodyear rv tire tech website tells us to use max sidewall pressures unless it causes a harsh ride..... or balloons the tire. In case of a trailer that has been over tired these folks make good cents/sense.
rvsafety.com
Tire Load and Inflation Ratings
Note: Towable – Travel Trailer/ 5th Wheel owners Due to the severe use conditions experienced by tires when axles are very close together – tire industry experts recommend maximum (sidewall) inflation pressure for towable tires unless this causes a sever over-inflation situation (20psi+), often referred to as the ‘basketball effect’. If this is your situation allow a 10 – 15psi safety margin above the minimum required inflation pressure.***
Keep in mind mfg tire pressure charts are a minimum which work good for a truck with axle toward the corners but don't work the best on a high scrub tire on a trailer with close spaced axles like our rv trailers have.
Good info. Never heard the requirement to air up to the max expressed quite like that.
