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Old 12-02-2017, 07:48 PM   #1
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Tire pressure

I finally had my 2017, 4519 weight at a cat scales is just by axel until I can get corner weight.
Front18,060 drive 18,180, tag 11,240
By the Michelin chart for the tires I can go down to
front XZA 365/70R22.5 105LBS, drive XZA1 315/80R 22.5 85LBS, tag XZA1 85LBS

I am going to put some safety factors into and operate at
front 110, drive 85, tag 95

Glen
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Old 12-02-2017, 08:23 PM   #2
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How did you arrive at the weight per tire to use on the chart? Until you can get real corner weights, about the best you can do is use 55% of each axle weigh as a corner starting weight, round up the chart weight to the next increment and add 5#. That's no substitute for having actual axle weights to work with, but it is probably a safe estimation. Remember that on duals, you split the corner weight (or estimation thereof) in half to get the appropriate pressure for each tire.

Your current tire pressures sound about right to me, but I don't have the same coach, so I can't be sure.

TJ
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Old 12-03-2017, 11:11 AM   #3
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Tire pressure information.
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Old 12-03-2017, 03:16 PM   #4
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Jim, I agee, but as I posted, until I can get corners weight.
It is not that easy to find someone that can corner weight that is calabrated, I have been trying.
Looking at the front tires the axel wt was 18,060, using the Michelin chart 105 lbs will work, I know one side will be heavier than the other so I added a safety factor of an additional 700 lbs.
Jim, I will still try to get the corners weight, but until I can find one (that is calibrated), what would you sugest, do you know any in south texas?
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Old 12-03-2017, 03:19 PM   #5
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Quote:
Originally Posted by gm77979 View Post
Jim, I agee, but as I posted, until I can get corners weight.
It is not that easy to find someone that can corner weight that is calabrated, I have been trying.
Looking at the front tires the axel wt was 18,060, using the Michelin chart 105 lbs will work, I know one side will be heavier than the other so I added a safety factor of an additional 700 lbs.
Jim, I will still try to get the corners weight, but until I can find one (that is calibrated), what would you sugest, do you know any in south texas?
Escapees in Livingston? I know they’re North but they do it anytime for about 50 bucks.
BTW, your pressures look good to me except I’m not sure why you would bump the tag?
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Old 12-03-2017, 06:23 PM   #6
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Looks like you are assuming a 50-50 weight distribution on the front axle. Personally, I wouldn't be comfortable with that assumption.

If you assume 55% of the total front axle weight (18,060#) as an approximate corner weight for each side, you get 9,933# per side. Looking at the appropriate Michelin pressure table, that weight is split between 9,820# (T/P =115#) and 10,200# (T/P = 120#). If you add the suggested + 5#, you are at the max inflation for that tire of 125#.

For me, the 110# T/P is marginal. The fact that a 55% weight distribution calcs brings you to the max inflation for that tire makes me wonder. It might be OK, but it would sure give me some incentive to get the actual corner weights with the coach fully loaded as it would be when you are traveling in it. I didn't do the calcs for your other axles, but I would use the same 55% assumption on them.

Unfortunately, I don't know any places in Texas where you can get corner weights, though one has been suggested by another poster. If the State of Texas has truck weight stations (like my home state of Washington does), you might find out if the scales are left on when the station is closed. They are up here and I was able to find a time when the station wasn't staffed to do corner weights.

Our weigh stations have scales on both sides of the scale house. It was just a matter of using both sides with one set of wheels just off the scale pads. We weighed one side, looped around through the adjacent rest area and weighed the other. I have double-checked those weights on another set of scales and they were pretty close.

TJ
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Old 12-03-2017, 07:21 PM   #7
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A question for all owners
Have you been able to get your corners weight?
And if so was it more than 5% per axel?

Thanks
Glen
2017 Mountain Aire 4519
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Old 12-03-2017, 08:31 PM   #8
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Quote:
Originally Posted by gm77979 View Post
A question for all owners
Have you been able to get your corners weight?
And if so was it more than 5% per axel?

Thanks
Glen
2017 Mountain Aire 4519
Got mine 4 corner weighed and my gestimate from the Cat scales was just fine, if that’s what you’re asking.
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Old 12-03-2017, 08:36 PM   #9
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Quote:
Originally Posted by gm77979 View Post
A question for all owners
Have you been able to get your corners weight?
And if so was it more than 5% per axel?

Thanks
Glen
2017 Mountain Aire 4519

I've not been able to find a scale for four corner weight. I've been using the truck scale weights I took 13 years ago.

Has worked fine for 87,000 miles using the Michelin suggested pressures.
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