Recommended tire pressure

[cygnussailor]

I looked at the tires and saw that they were rated at 110psi. While this may be true I am wondering what the recommended tire pressure really is?

Thanks,

Gary Harkins

[Jerryr]

I looked at the tires and saw that they were rated at 110psi. While this may be true I am wondering what the recommended tire pressure really is?

Thanks,

Gary Harkins

What brand and model tire
What size tire
What trailer
What does the label on the trailer side state?

[Country Campers]

My pennies worth is to inflate to pressure listed on the sidewall of the tire. Tire should state "weight at max tire pressure".

Brian

[RVRunners]

I agree having details on your rig, the weight, the tires, the rims, etc. is best for people on the forum to give accurate advice, however, I do keep my tires at the full cold pressure listed on the sidewall of the tire. Prior to changing my tires the sticker on the fifth wheel also called for the same pressure. Individual units may vary but the sticker should be near the front street side of your rig. It is in roughly the same format as the one on the door post of your truck.

[howson]

I looked at the tires and saw that they were rated at 110psi. While this may be true I am wondering what the recommended tire pressure really is?

Thanks,

Gary Harkins

Gary,
From https://www.etrailer.com/faq-trailer...questions.aspx

Special Trailer (ST) Tires and Air Pressure
Some tires are specially designed to be used on trailers. These tires include the letters "ST" in the size specification that is listed on the sidewall. The "ST" stands for "special trailer". This kind of tire has a stronger sidewall than an automobile or truck tire so it can handle higher air pressures and higher loads.

Special trailer tires should be inflated to their maximum air pressure. The value for the maximum air pressure should be listed along with the value for the maximum load on the tire's sidewall. These values will usually designate the maximum load at a maximum psi. For example, if the tire is rated at 1,610 lbs maximum at 65 psi, the tire can carry 1,610 lbs of weight if the air pressure is at the maximum of 65 psi. At the maximum air pressure, the tires will perform and wear best, and get the best gas mileage.

If a trailer tire is inflated to a lower air pressure than the maximum, the amount of weight that the tire can carry will be reduced. If a heavier load is put on the trailer tire than what is recommended for that air pressure, the sidewall of the tire could heat up and cause the tire to fail.

You should always inflate your tires when they are cold.

If a tire is over-inflated, it will wear more in the center of the tread, all the way around the tire. If a tire is under-inflated, it will wear on the outside edges of the tread, all the way around the tire.

Check out Special Trailer (ST) Tire Maintenance on Tire Rack's site (about halfway down the page): https://www.tirerack.com/tires/tiret...jsp?techid=309

I was amazed when I first saw a chart like this: http://www.yournexttire.com/trailer-...flation-chart/
What it shows is the dramatic drop in load carrying capacity of an ST tire at reduced pressures.

My .02--inflate per the manufacturer's sticker (110psi cold) and call it a day.

[arhayes]

Ditto on using max cold inflation!


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[MidwestCamper]

I looked at the tires and saw that they were rated at 110psi. While this may be true I am wondering what the recommended tire pressure really is?

Thanks,

Gary Harkins

This has been overly covered on the forum where if your tires are original to the RV, then air them to the recommended cold inflation pressure that is listed on the yellow tag installed by GDRV.
If you have tires that are of a higher load capacity than the originally supplied tires, you can use the pressure chart supplied by the tire manufacturer such as the attached from Goodyear.

[bertschb]

I always wondered what "cold" meant for tire pressures. Is 60 degrees cold? 20? I pumped my Sailun S637 tires to 106psi at 25 degrees thinking they would be at 110psi (at 60 degrees). I checked them the next morning at 55 degrees (in CA, not freezing cold central OR) and they were still 106psi! That surprised me.

What's even more surprising is these tires went to 124psi while driving at 60-70 degrees ambient. 20% jump in pressure!

[acadiaforever]

I like this definition of "cold": having not been driven, nor in the direct sun, for the past two hours. "Cold" in the summer will be warmer than "cold" in the winter. In setting the pressure at the ambient temperature, you will be accommodating roughly the same pressure increase during use, regardless of what that ambient temperature is.

So yes, as we experienced continually falling temperatures this fall, we had to add air to accommodate those lower temps.

[Edit] And your driving pressure increase seems about right. I've seen my Westlakes go over 130.

[warsw1]

I looked at the tires and saw that they were rated at 110psi. While this may be true I am wondering what the recommended tire pressure really is?

Thanks,

Gary Harkins

I always inflate mine to 110psi cold.