Tire pressure at 80 PSI ?

[CodyClassB]

I see that the tires on my class B RV is clearly marked 80 PSI, but the previous owner have all 4 tires at around 60 PSI . Should I increase the pressure to 80 PSI ? Sorry to ask this silly question , but I am new to RVs . All the tires for my cars and SUVs are marked at around 35 PSI . Here are some pictures









Moderator had to edit photos to 640 per forum standard.

[My_Roadtrek]

To make things a little more simple. Your Class B should be 80 rear, and 65 front.

[DUNEBUGGYDOUG]

As per J-D's advice I too lowered my tire pressures.I was running 80 PSI and after weighing it and going by the Michelin pressure chart and J-D's advice I lowered the PSI, what a difference in the handling.I now run 55f/70r inthe tires on my E-450.You just can't go by what is stamped on the tire as many, including myself , did.WEIGH IT, WEIGH IT

[Handbasket]

Read the whole label on the tire, not just the big print. It's something like 'Max load xxxx lbs at 80 psi'. This is a major hint that correct inflation is weight-based.

Some upfitted vehicles take a bit more due to unusual vehicle dynamics, like my previous Roadtreks... 70 psi rear (IIRC) by weight, 50 front. But that didn't allow for the top-heaviness of a B. I ran 65 F & 80 R. No issues with good tires, other than squirrely Dodge handling.

Load as for travel, including passengers. Go to the scales. Look at the tire maker's inflation/load chart. Add some air in the rear if it drives better.

Jim, "Some people hear voices... some see invisible people... others have no imagination whatsoever."

[Old-Biscuit]

Vehicle GVWR....8700#
FAWR............4000#
RAWR............5740#

Data plate states
Front air pressure.......45 psi
Rear air pressure........80 psi

Simple.......run what the data plate states

[Islandman]

On our 2001 PW Excel on the Dodge chassis, I carried 80psi on the rear tires and usually 55-60psi on the front tires. We didn't carry full loads but always had lots of stuff so came close to the max weight rating. I used the info suppliied by PW on the door post rather than rely on opinions from different users. In over 20K of driving, some of which was on gravel and rough roads up in western BC, YK, and NT never had a problem with handling or tire wear.

[Sebtown]

My Airstream Interstate calls for 80lbs in both front and rear tires.

[Mont_G_J]

Quote: Sorry, I didn't include the manufacture's tag in the first post . Here is the tag . Why is the PSI on the front rim is 45 PSI and in the rear is 80 PSI ?

Because the rear tires carry more weight than the front.
Unless you weigh your vehicle and go by the pressure chart, then inflate your tires to the manufactures specifications as shown on the door jam decal.

[jjson775]

Your wheels look like they are on an E-350 Ford chassis like a Pleasure Way Excel. There should be a sticker somewhere in your RV that gives the recommended tire inflation pressure. For a PW Excel it is 80 psi for the rear wheels and 55 for the front. It is very dangerous to drive with underinflated tires. With water, a full gas tank and your travel stuff you will almost certainly be fully loaded and need to fully inflate your tires.

The problem is you can't get 80 psi at a gas station so you need a portable 120 volt compressor to pump up your tires. The kind that plug into your cigarette lighter are no good except for emergency use. I carry a small compressor I got at Sears. Good luck and happy RVing!

Jim

[CodyClassB]

Sorry, I didn't include the manufacture's tag in the first post . Here is the tag . Why is the PSI on the front rim is 45 PSI and in the rear is 80 PSI ?



I only added the microwave and an additional battery to the van . That shouldn't add too much weight .

thanks NHIrish, DUNEBUGGYDOUG , brirene , Mont G&J , jjson775
(and those my post after) for your help.

Moderator had to edit photo to 640

[Mont_G_J]

The Max load of 3040 Lbs is at 80 PSI. However, if you determine by weighing your Class B that the tire load is actually less than the Max (3040), you may reduce tire pressure according to the chart below.

[brirene]

I'll agree with weighing the rig to make sure you're not overweight, but also think you should inflate to the pressure indicated on the tire. 25% less that recommended is surely not doing your tires any favors.

[DUNEBUGGYDOUG]

For you to get the correct PSI, you must weigh your rig.Based on the weight will determine how much PSI in your tires, not what is stamped on the tires

[NHIrish]

Yes...assuming the wheels are rated for that psi and an e rated tire was stock on the vehicle. The tire carrying capacity is based on max psi.

Decreasing the psi de-rates the carrying/load capacity of the tire.