tire pressure
just had new G rated Sailun tires put on rig. These tires are rated at 110 psi Our rig weights around 19,000 lbs Am I okay to keep the psi at 90lbs or should I always keep them at 110 psi?
Forum Discussion
Some folks do silly things like mount a load G tire at 4080-4400 lbs on 5.2k/6k axles with 2500-2800 lb load per tire. Then derate them to 80-90 psi. Most RV folks can get by with it as they don't use a tire long enough to wear it out plus a commercial grade all steel carcass tire like the S637 can take abuse like that. One newby actually went with 17.5" load H S637 at 6006 lbs capacity per tire on his trailers tandem 6k axles with 2550 lb load per tire. Aired them to 80 psi and complained about them running hot and mpg drop for his 6.7 Ford truck.
Lots of blogs from industry experts on this subject and they all run about like this one....
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.
Lots of blogs from industry experts on this subject and they all run about like this one....
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.
