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Old 09-15-2018, 09:38 AM   #1
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Michelin run psi

Just wondering what most of you run with (psi) on your Michelins. We’re towing 2018 Classic 33 with Silverado 2500 HD Duramax. Been using 75 psi but getting some rough riding to trailer.
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Old 09-15-2018, 09:50 AM   #2
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80 for 17 classic with 16 Michelins. All good.
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Old 09-15-2018, 09:59 AM   #3
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Quote:
Originally Posted by DeltaRon View Post
Just wondering what most of you run with (psi) on your Michelins. We’re towing 2018 Classic 33 with Silverado 2500 HD Duramax. Been using 75 psi but getting some rough riding to trailer.
GIYF (Google is your friend)
https://www.michelinrvtires.com/refe...tion-tables/#/
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Old 09-15-2018, 11:48 AM   #4
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60 lbs is good for over 2000 per axle. My loaded axle weight is 7340 (two axles) so I am running 65 this trip. First trip on my new Mickies.

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Old 09-15-2018, 12:11 PM   #5
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Probably you will need to get it all loaded up as you normally travel, then run over the scales to see what weight you have on each axle. If you want to be very OCD about this, measure the weight on each wheel.

Then look at the chart provided by Adventure.AS and use the appropriate pressures. My guess is you are going to be above 9000 lbs gross weight, thus 65 psi is about right.
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Old 09-15-2018, 12:42 PM   #6
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That chart is XPS RIB, not what's on AS.
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Old 09-15-2018, 03:35 PM   #7
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I used to run 75-80. But a post by a long time exceptional Airstream dealer recommends 60-65. Reason is as Ron stated limit rough ride and he said the tires can easily take the weight at this lower pressure
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Old 09-15-2018, 03:39 PM   #8
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80..and no rough ride nor damage in some 35K with LTX tires.
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Old 09-15-2018, 04:14 PM   #9
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72lbs with single axel FC20. Too rough higher and appears to be too much sidewall bulge at 65...
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Old 09-15-2018, 06:12 PM   #10
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Been running 80 psi for 6 years now on my heavy 30' Classic slide out. No signs of stress to the trailer or ill effects on the trailer. This will most likely be my last season on these tires.

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Old 09-16-2018, 05:18 AM   #11
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65psi
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Old 09-16-2018, 10:25 AM   #12
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My axle weights were from a cat scale run. Fully packed and loaded for travel, empty black and gray, full fresh water and propane.

I was surprised it came in so low - but I have a 30' International, so there should be some difference from a Classic.

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Old 09-16-2018, 11:17 AM   #13
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Old 09-16-2018, 02:50 PM   #14
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I just got my new 16” for our Eddie Bauer, had planned to run them at 55 lbs, that figures to slightly over 8000 lbs as I read the chart. Am I missing something?
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Old 09-16-2018, 05:59 PM   #15
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Trailer and tire specs on my 18 classic says 80 (cold temp) psi. That’s what I have been running as a result. Also have tire psi sensors to ensure they run at okay psi. I have seen it as low as 78 cold and as high as 90 warm. Trailer has felt great since day 1.
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Old 09-17-2018, 06:47 AM   #16
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80psi. Smooth ride and no issues.
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Old 09-19-2018, 04:59 PM   #17
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Last week we took our first trip since I installed Ford's TPMS trailer tire sensors on our 2018 30' Classic and integrated them with my 2017 F250. The Michelin LTX M/S tire pressures were set to 78 PSI (cold) before we left, which was close to the Airstream spec of 80 PSI.

On the road with ambient temperature in the mid to high 80's and at about 5000' elevation, I was somewhat surprised to find that pressure spiked at 92-94 PSI across all 4 tires, which concerned me a little. I readjusted the cold pressure to 72 PSI and during the return trip I saw hot pressure readings in the mid 80's, which seemed more appropriate.

I assume AS must take into account the pressure increase which occurs with tire heating when they recommend an 80 PSI cold setting but, OTOH, maybe they figure setting PSI on the high side is better than setting it too low and want to include a margin of safety. My thought is that it might be good to adjust cold pressures to expected conditions. Anyway, having the trailer PSI read out proved to be useful and instructive.
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Old 09-19-2018, 05:11 PM   #18
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Old 09-19-2018, 05:34 PM   #19
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72 lbs with 28’ International and zero issues after 7k miles thus far.
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Old 09-20-2018, 04:23 PM   #20
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Hi

All tire pressure numbers are for a cold tire. What happens as they heat up is not what the pressure spec is about. Checking pressure on a hot tire is not going to do much good.

The main logic for running below max pressure is that the tread wear is more even and the braking will be a bit better (more road contact). I'm not sure how many of us will wear out the new Michelin LT tires based on treads. Normal end of life for trailer tires is time ( 5 to 7 years) rather than tread or mileage.

The math:

Tires are rated for 50-60,000 miles. Warranty is for 6 years. 60,000 / 6 = 10K miles per year. That's a lot of trailer miles for most of us ....


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