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Old 12-24-2016, 11:54 AM   #1
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Question Tire Pressure- BayStar

I am always getting conflicting info on air Pressure. 22.5 wheels and the Michelin chart shows a lot less than the posted 90psi on the coach sticker. Also, you would think you need a few more in the rear than you would up front since a lot more weight in back. I did weigh each axle at a truck stop.
Right now I'm running 90psi all around.
So what are you Baystar people running for Air Pressure. Just curious.
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Old 12-24-2016, 12:06 PM   #2
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Since you have the front and rear axle weights and know your tire size, check the Michelin tire chart for the correct tire pressure. The Michelin tire chart is available on the Internet. You may be pleasantly surprised how the coach handling and ride improves after adjusting to the chart tire pressure.

I run about 5# over the recommended pressures for my tires to allow for some normal leakdown of less than 1# per month.
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Old 12-24-2016, 12:07 PM   #3
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You have duals on the back, they split the load. If you have 90 up front I'd guess at 70 out back, rough guess. The Michelin chart should show you those numbers.
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Old 12-24-2016, 12:36 PM   #4
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Here is my confusion.rear axle wt= 13,560....\2. Makes each side of axle 6,780 For the front. Wt= 6,580.....\2 makes each axle 3,290.
The Michelin chart doesn't go down to 3,290!!! But if I use their chart then here are the PSI numbers I should be running. Front 70 psi, Rear 80 psi.

That sounds totally wrong to me. I must be reading the chart wrong. The tires are the Michelin XRV 235/80/22.5
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Old 12-24-2016, 01:11 PM   #5
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Hi Maddawg46,
You are correct. 70 in the front and 80 in the rear. I admit most coaches carry more PSI in the front tires than the rear. However, you are reading the chart correctly.
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Old 12-24-2016, 02:08 PM   #6
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That's ok even though my sticker on the drivers side wall next to the seat says
90 PSI?? That's kinda scary. I've been running 20 lbs over in the front for 6,700 miles!
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Old 12-24-2016, 02:29 PM   #7
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Quote:
Originally Posted by Maddawg46 View Post
That's ok even though my sticker on the drivers side wall next to the seat says
90 PSI?? That's kinda scary. I've been running 20 lbs over in the front for 6,700 miles!
20 lbs over generally would just mean a harsher ride and possibly slightly more center tire wear. It is not a dangerous condition.

Now, 20 lbs UNDER would be a whole 'nother story

RVSEF generally recommends running 5-10 psi above what the weight charts indicate when weighed as typically loaded for a trip, including all passengers in their usual spots, to give you a safety margin for changes in "stuff" that you've loaded.

Michelle
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Old 12-24-2016, 03:24 PM   #8
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The 90 is still less than what the tire can support so not to worry. The same number discrepancy exists for mine.
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Old 12-24-2016, 03:46 PM   #9
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Quote:
Originally Posted by EZDZIT View Post
Since you have the front and rear axle weights and know your tire size, check the Michelin tire chart for the correct tire pressure. The Michelin tire chart is available on the Internet. You may be pleasantly surprised how the coach handling and ride improves after adjusting to the chart tire pressure.

I run about 5# over the recommended pressures for my tires to allow for some normal leakdown of less than 1# per month.
The following link will give you some very good info on your tires needs:

https://tiretraker.com/michelin.pdf
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Old 12-24-2016, 05:35 PM   #10
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Since I could not weigh each axle end separate at my truck stop I will add 400 pounds to the devided axel weight allowing for more weight on one axel end. So I think I will leave 90 rear and lower the front to 80
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Old 12-26-2016, 08:19 AM   #11
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Hi Maddawg, I have same unit as yours but a 2015. I weighed mine this past summer ready to camp but no water. Frt axel was 6,800, rear was 12,800. Weights were quite even between left and right side. The Michelin chart said frt should be 75 to 80 psi and rear should be 80 psi. I settled on 80 psi for the front and 85 psi for the rear. During hot weather the fronts will creep up to 95 psi or so and the rears around 100 psi or a little over. Wanted to keep them under 110 psi during hot weather.
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Old 12-26-2016, 06:58 PM   #12
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Quote:
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Hi Maddawg, I have same unit as yours but a 2015. I weighed mine this past summer ready to camp but no water. Frt axel was 6,800, rear was 12,800. Weights were quite even between left and right side. The Michelin chart said frt should be 75 to 80 psi and rear should be 80 psi. I settled on 80 psi for the front and 85 psi for the rear. During hot weather the fronts will creep up to 95 psi or so and the rears around 100 psi or a little over. Wanted to keep them under 110 psi during hot weather.
Does yours ride or steer better when you lowered the pressure, or have you always run those pressures?
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Old 12-26-2016, 07:43 PM   #13
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I ran 90 psi for half a year then after weighing, lowered them to current psi. Ride improved somewhat, not as rough. I also added a Blue Ox rear track bar which improved handling when being passed by larger vehicles.
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