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Old 09-07-2014, 07:10 PM   #1
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Tire Pressure on Freelander 19CB

Mine is a little shorter than the 21QB

Discount Tire says it should be what it says on the tire 80 pounds. All the tires are the same brand and model. It has dual tires on the rear. Are they correct?


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Old 09-07-2014, 08:26 PM   #2
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The 80 lbs is probably the max pressure for that tire. What you really need to do is load the coach then weigh it on all 4 corners then check the tire manufacturers web site. They should have a table showing the correct tire pressure based on weights for both the single and dual axles.

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Old 09-08-2014, 01:37 PM   #3
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No, they are not correct. 80# on the rear is one thing, but I can't imagine how the MH would ride with 80# in the front tires. As suggested, get it weighed fully loaded, with people and gear, with weights for each axle at least, if not able to get corner weights. Adjust tire pressure according to the Load & Inflation Tables | Michelin Truck
2014 Itasca Spirit 31K
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Old 09-11-2014, 06:41 PM   #4
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You should go back to Discount and speak to the manager. He has an employee giving very bad, as in dangerous advice. There is no way your rig has enough weight at either end to justify 80 psi. I run 60 psi in our 24" C and that includes a 20-25% fudge factor on the weight they carry as per the Michelin chart.

I had a similar experience at the Discount Tire in Lake Havesu. Stopped in just to have the pressure in all 6 checked (in the middle of a 2,000+ mile trip), and asked the guy to make sure all were set to 60#. He asked me why I didn't want 80 all around and I explained that fully loaded the rig only weighs 10,050#(GVWR 11,500 payload 3,368#). Frankly 60 is overkill but the ride/handling are still very smooth and even if I loaded the additional 1,450# of remaining payload the 60 psi would handle it.

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Old 09-12-2014, 10:43 AM   #5
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Originally Posted by rlastar View Post
Mine is a little shorter than the 21QB

Discount Tire says it should be what it says on the tire 80 pounds. All the tires are the same brand and model. It has dual tires on the rear. Are they correct?

Your chassis should have a sticker on it stating what the manufacturer recommends. In general you can use a higher pressure, within reason. If you are unsure then you can judge what the best running pressure is by monitoring the tire wear profile. If you see the center tread wearing faster, then the pressure it too high.

If you are wearing off the sidewalls, the pressure may be too low or the front end could be out of alignment if this occurs only on the front tires.

Over the decades I have found inflating to 10% over the manufacturers recommendation gives better life and fuel economy. Regardless of what pressure you use, you should monitor the wear pattern.
Phyllis & Stephen - 2014 Itasca
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Old 09-12-2014, 10:54 PM   #6
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The tire pressures suggested on those stickers from the manufacturer are more than likely the tire pressure needed for an axle loaded to it's GAWR. In many cases that would be much more than the pressures requires by the actual load. I don't see any need for increasing them by 10%. In my case when I'm fully loaded on my newer Itasca, each axle is around 81-82% of its capacity. There's no need to air the tires up to 110% of the axle rating. That would just make for a harsher ride.
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Old 09-13-2014, 10:59 AM   #7
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Two pressures that are nearly ALWAYS wrong are....

The one molded into the tire,, (Actually it is correct if you read the FULL sentence which is something like Maximum Load 20,000 pounds at maximum pressure of 100 PSI" most people only read the "Maximum pressure 80 psi" part)

And the one on the sticker somewhere inside (door, glove box, cupbord wherever)

The proper pressure is found by: Load for travel, Weigh the Wheel (All of them in most cases we call it "4 corner" weighing more in a paragraph or two.

Then look up the tire maker's inflation chart and find out what THEY say, not the dealer (he's clueless) the tire maker. Many folks like to add 5PSI, I agree with them.

How to do 4 corner weights 2 methods.

1: RV Safety & Education Foundation and follow the links to weigh my rv.

2: Find a FLAT segmented (optional) scale.. MUST be a FLAT scale, not a bridge scale.

Drive onto the scale so each axle is on a different segment, Get the printout

Now drive so only one SIDE of the vehicle is on the scale, again each axle on its own segment.

now you have wheel weights for the side on the scale
Substract those from the first pass and you have the other side.

job done.
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Old 09-13-2014, 06:15 PM   #8
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Our Freelander 28QB sticker indicates 60 front and 80 rear. We have Uniroyal Laredo's 225/75R16. I have not been able to find an inflation load table for Uniroyal. I inflate the front to 65 so that I do not have to haul out the compressor every time it loses a pound. The Uniroyals show a max pressure of 80 psi so I keep the rear 80-82 when sitting between trips. Loaded for trip rear axle weigh is 8000+ front 4000+ so we have between 1,500 and 2,000 pounds additional capacity.

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