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Old 11-19-2019, 03:40 PM   #1
Shoregrass
 
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Cool Tire pressures

I have a 2020 Vista 29VE. The info plate on the wall near the driver's seat says that I should run my 19.5" Goodyear tires at 82 psi. The tire sidewall says that the max. load pressure for these tires is 110 psi. I have started running the tires at 86 psi. to get better gas mileage... maybe I could even run them harder? I know there are some factors here that I need to be aware of - like heat expansion in the summer and the fact that I don't want to shake this thing apart on poorer road surfaces. Even fully loaded according to the sidewall, I'm still under the max. individual carrying weight for the fronts or the duals in the back. I had it weighed on a scale.

Any thoughts?
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Old 01-23-2020, 04:52 PM   #2
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Ignore the number on the tire itself; it has no bearing to YOUR RV, it is only relevant to the maximum weight that the TIRE can support, and that tire can be (and is) used on more vehicles than you can count. The placard near the driver's door reflects the pressure needed for the maximum weight that your RV should ever see; in other words, fully loaded up to it's GVWR. Can you go higher psi? Yes, but your ride (as well as control) will likely suffer, and I doubt that you will ever see an actual measurable difference in mpg. Your best bet is to actually weigh your RV, loaded for camping (4 corner weigh is best, but at the very least, each axle), and then use the tire pressure charts for your tires and adjust your pressure accordingly. That will give you the best handling, wear, and control.
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Old 01-23-2020, 08:10 PM   #3
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4x4van is correct but I'd like to expand on it a bit:

There are a lot of Winnieowners threads addressing the tire pressure issue. Rather than repeat what's already been posted I suggest you use the Google search box at the top of the page to search for "tire pressure" and read as much as you can. Pay particular attention to posts by Roger Marble who posts on Winnieowners as Tireman9. He's a retired tire engineer and is our resident expert.

In the meantime, inflate to your door placard pressures until you understand the process of weighing and using tire pressure tables. Note that, assuming you're not loaded to your rig's GVWR, the weight/table pressures will be less than those on the door placard and likely will give a more comfortable ride.
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Old 01-23-2020, 09:27 PM   #4
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Agree that there is a tremendous amount of info and discussion of tire pressure but I've also come around to a bit different thinking, once I got Tire pressure monitors on all wheels. I am always a bit fussy about keeping air in the tires but now I look at it in a less critical way as I see it can never be exactly "right". It will always be a bit of compromise as well as some "windage" for different temperatures and conditions. You are not likely to really be loaded the same on every trip and the outside temperature and weather is certainly going to vary.
So I've stopped sweating it quite so much! Reason for that is that I can see what the pressure does at all times and it shows me that things like sunlight on one side, does give me a different pressure. Parked at the house, the tires shaded by the fence differ from the other side! Driving for twenty minutes on a hot day gets me a quite different tire pressure than on a cold day. The inner dual gets different loading, depending on the shape of the road! Until they figure a practical way to adjust the pressure as we drive and do it automatically, I'm never going to have the exact right pressure, so I go for the best I can do and call it a day.
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Old 01-24-2020, 10:14 AM   #5
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Quote:
Originally Posted by Morich View Post
Agree that there is a tremendous amount of info and discussion of tire pressure but I've also come around to a bit different thinking, once I got Tire pressure monitors on all wheels. I am always a bit fussy about keeping air in the tires but now I look at it in a less critical way as I see it can never be exactly "right". It will always be a bit of compromise as well as some "windage" for different temperatures and conditions. You are not likely to really be loaded the same on every trip and the outside temperature and weather is certainly going to vary.
So I've stopped sweating it quite so much! Reason for that is that I can see what the pressure does at all times and it shows me that things like sunlight on one side, does give me a different pressure. Parked at the house, the tires shaded by the fence differ from the other side! Driving for twenty minutes on a hot day gets me a quite different tire pressure than on a cold day. The inner dual gets different loading, depending on the shape of the road! Until they figure a practical way to adjust the pressure as we drive and do it automatically, I'm never going to have the exact right pressure, so I go for the best I can do and call it a day.
Well said. I've weighed my RV once - 4 corner - and set the pressures on each axle accordingly. Haven't touched them since, other than to occasionally check to see if they've lost air (Manually since I don't have a TPMS). Will likely re-weigh every other year or so to make sure that I'm still in the same weight range, but I'm not too worried about "weight creep" since I am at the lower end of the weight range for the pressures I'm running. I do occasionally check temps with an infared temp gun while traveling, but I try not to overthink things.
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Old 01-25-2020, 09:28 AM   #6
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I was simply amazed at how much the small things change the pressure. My info says 82 PSI for all six wheels and I was finding the dealership had them all at 120 for cold temps, so I started working the pressure down while adding the TPMS. Going slow until I found what really was needed and got it weighted but not wanting to let too much out and have to get out the compressor to add it back!
So as I let air out in the morning and found the pressure higher when I got back to it after lunch, I began to look at why! Nobody sneaking out there to add air, so where was it coming from or was the TPMS messing with my mind?
Turns out that the sun creeping higher on a cool day and it hitting the tires on one side and back was the cause of a big jump in pressure!
I quickly became less hyper about getting all the tire pressures set just right! Small questions come up like, "do I run the inner dual on the right lower because the tailpipe runs past it?"
Just not as simple as adding the "correct" pressure, is it?
Unless I want to stop every few miles to let some air out when I hit a stretch of bumpy road which makes the tires flex more and heat more. Do I stop and add some more air if I hit a rain shower that cools the tires?
I now run what I feel is about the right pressure, make sure they are never run on too low and stopped worry about getting it right!
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Old 01-25-2020, 10:09 AM   #7
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Interesting reading..I also have the 29VE and had the Crossfire tire equalizer system installed using the 82 psi.kit on the rear wheel duals.. The tires were inflated to the required pressure reflecting the Safe Yellow flag ...too much pressure changes it to Red and too little indicates Black...Air temperature was appx 65* On our first trip out I was interested if and how the tires change and after only 30 miles we stopped at the local Pilot truck stop for gas, both sides were in the Red..So it seems to me the tires are running between the low 82 psi and whatever the ambient / road temperature is affecting the high temp range.. so I have little actual imput maintaining a perfect pressure..in this case the tires increased 12 psi according to my air gauge so now I am running at 94 psi?..So the bottom line I suppose is maintain the psi when the tires are not in direct sun or not exposed to winter conditions..The tire manufacturer obviously takes all this into consideration when they advise min and max inflation rates knowing they could be used at minus 20* or +100* degrees..To be sure you need to replace them at the suggested time interval..and it would be up to us to make a visual inspection for tread wear or separation or sidewall damage to keep us safe on the highways...
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Old 01-26-2020, 09:04 AM   #8
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In looking around for what might be best on tire pressure, I found a bit of info that is on the Winnebago site which gives me a bit more info and I thought might also be of interest to the group. I find there is way too much info available to read it all and this is one bit that I had skipped over many times but in reading it now, I may have spotted something that I might change in how I maintain my RVs.
Maintenance is almost always going to be a compromise between what is recommended and what we each find works best for us and this is certainly true when we look at our tires on RV.
Do a careful read of this item and see how it might change your routine:
https://winnebagoind.com/resources/s..._Tire_Wear.pdf
It involves why it is recommended to have the alignment checked and adjusted after you get your new RV loaded. I have to admit that I have NEVER had one aligned, my excuse being that I have never had a problem with tire wear and assumed it was aligned correctly when built!
Seems that may be more a matter of load and luck than actual good practice!
The bottom line for me seems now to be that I do need to keep a critical watch on my
tires for any signs of unusual wear but how to react to what I find is still a bit of question in my case.
This is one that certainly varies, depending on how and what we each drive as a full time roadrunning guy may have a totally different plan than somebody like me who puts just a few thousand miles on a year. We each have to balance the time, expense and nuisance of what we spend on preventive work versus what it might save us on tire replacement. RV maintenance and things like tire alignment tend to be very expensive, so the question becomes how we want to deal with that problem. Do we spend several hundred dollars to save a set of $200 tires or are we looking at saving a set of $600 tires?
Or do we worry less as we know the tires will need to be replaced before the wear gets to them as we simply do not drive that much?
I'm in the "watch and wait" group as tire wear has never forced me to replace tires on any of the multiple motorhomes I've owned.
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