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Old 06-03-2010, 04:28 AM   #1
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Tire pressures

Hello,
I recently purchased a 2004 Adventurer on a W22 Workhorse chassis with Michelin 80r 22.5 tires. The side walls read 110 max psi at full load. I've read that it's not good to run them over or under inflated. They all had around 90 psi when I bought it. I'm not carrying a lot of weight other than a full tank of fuel, 2/3rds tank of water, two people, clothes and food. Should I be running more than 90 psi?
Thanks
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Old 06-03-2010, 08:43 AM   #2
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Before you change anything, weigh your coach loaded as you normally would. Then check the load charts on line.

FYI, Thereare many "CAT-Scale" locations around. Check on line for locations. Look for a truckers stop and or a large trucking terminal. There will be a small fee but the payback will be priceless.
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Old 06-04-2010, 07:13 AM   #3
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Thanks bdaball, I am finding out that this is a more complicated issue than I first thought! I will be looking for a place to weigh before our next major trip.
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Old 06-04-2010, 08:30 AM   #4
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In the meantime, there should be a sticker on the wall by the driver's seat showing the GVWR, axle weight ratings and recommended tire pressure for each axle (front and rear may be different). Use that pressure until you get a true weight. The recommnded pressure will be for max axle load and you are probably less than that, but its better to be over than under pressure.
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Old 06-04-2010, 09:40 AM   #5
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RV Safety, Merritt Island, Florida On the left side is a link to getting your rig weighed

They weigh EACH WHEEL (not tire but wheel) using portable calibrated scales and then tell you what the proper inflation is for each wheel.. They also provide some other information and service.

This is the ONLY way to get it right unless you can find a flat scale where you can do it yourself.. And that will cost about the same amount.
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Old 06-05-2010, 06:37 AM   #6
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Thanks Gary, sounds like good advice. How important are the pressure bleeding caps? Four out of the six wheels had them on when I got it. Our first weekend out, when we got to the camp we were staying, I noticed one of the outside rear tires was flat (completely off the bead). Fortunately the camp maintenance guy was able to get it pumped up and diagnosed the problem as a faulty pressure bleeding cap. I'd never heard of these before and am wondering if I should make sure I have them on all six.
thanks,
Rod
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Old 06-05-2010, 06:44 AM   #7
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Thank wa8yxm for the link, very informative. We are attending the Gypsy Journal gathering in August and the rv safety folks are going to be there weighing rigs, so if I can't get weighed before, I'll do it there.
Rod
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Old 06-05-2010, 07:34 AM   #8
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The valve stems should be covered with caps to keep out dirt. They really aren't "bleed caps" - just protective covers. Sometimes a valve extension can be faulty and bleed off air, though.
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Old 06-05-2010, 04:52 PM   #9
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Pressure too high up to the limit on the tire sidewall will not hurt anything. But pressure over what is needed will make the ride harsher. But it sounds like you have some real issues though with the tire going flat. You better make sure you get that fixed. I have one of the pressure monitors on my coach. I don't always check it, but maybe once a week I take a look. Keep in mind that cold and hot pressure are significantly different on RV tires.
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Old 06-06-2010, 05:51 AM   #10
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Thanks Bob, I have soaped up the tire twice in the past week and check the pressure three times and I think it's OK now. Pretty sure it was a faulty valve extender.
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Old 06-06-2010, 11:59 AM   #11
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FYI, "Dually-Stems" would eliminate the need for extension.

See ad in the back of FMCA
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Old 06-07-2010, 07:20 AM   #12
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thanks bdaball, I'll check into them
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