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Old 07-06-2020, 11:00 PM   #1
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Extra tire pressure to avoid flat spots?

I just read my recent AAA newsletter and it recommended that to avoid flat spots to inflate the tires (while in storage) an extra ten pounds. I have never heard of that before. Is it correct information?

/s/ In storage due to Covid.
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Old 07-07-2020, 12:19 AM   #2
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I’ve never heard that on steel belted radial tires .
But things may have changed since I retired.
I’d have to say a visit to your tire manufacturer’s web site is in order.
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Old 07-07-2020, 04:11 AM   #3
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Put the jacks down and there won't be much weight on the tires.
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Old 07-07-2020, 06:20 AM   #4
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I inflate tires to/near max psi for storage.
I also made blocks just shy of the clearance under my retracted Jack's. When my air suspension lowers the blocks pick up a good share of the coach wt.

HWH has advised that long term Jack's can be extended or retracted but they do suggest periodically exercising them.
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Old 07-07-2020, 06:26 AM   #5
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The 10 additional PSI for storage probably accounts for some normal PSI loss that will occur naturally over time. Flat tire spots were a problem for glass bias tires, not so much for steel belted tires. A better option for long term storage is jack the vehicle up and take 50% or more of the load off the tires sitting on boards.
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Old 07-07-2020, 07:02 AM   #6
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Don has it right. Michelin's recommendation is to inflate the tires to the pressure on the sidewalls when it will be in long term storage.
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Old 07-07-2020, 09:31 AM   #7
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When I was working as a Tire Design Engineer I and others were involved in addressing passenger tire "Flat Spotting". While in general steel belted radials are less prone to flat spotting than bias tires were, we learned that as technology of lower rolling resistance constructions (for better fuel economy) moved forward, increased levels of flat-spotting became one of the trade-offs of better fuel economy.
Yes increasing tire inflation (or lowering the load) was one action that could reduce the tendency of any tire to flatspot due to the "creep" of tread rubber.
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Old 07-07-2020, 12:14 PM   #8
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Welcome to IRV2! We're sure glad you joined us!

After reading all the comments I will be inflating our tires to the max pressure indicated on the tires! Thanks for bringing this important subject to our attention!

Good luck, happy trails, and God bless!
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Old 07-07-2020, 12:43 PM   #9
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Yes - true advice - starting to wonder if our coach was pumped up because it was destined to sit on the Yellow Brick road until Tiffin reopened mfg.

Our initial thought was that the 105-112 was because experience led the dealer to start folks there since lots of RVs get loaded to gross in a hurry.

Not so sure now.
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Old 07-07-2020, 04:44 PM   #10
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I've seen that in one of the tire company's RV Tire Guide, but I've forgotten which one.

Goodyear actually recommends 25% over the recommended pis but not greater than the sidewall max load psi. Michelin just says inflate to psi shown on sidewall for max load.


The big Tire Data Book published by the TRA shows inflations of 10 psi above sidewall pressure for some specific situations, so obviously it's an safe thing to do.


Flat spotting is not much to worry about with modern tires. It used to be a real problem with nylon tire bodies and bias ply tires, but that was over 40 years ago now.
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Old 07-08-2020, 07:18 AM   #11
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For long term storage, I leave my jacks up and put a set of wood blocks under each jack. I then dump the air bags. The coach will lower down on these blocks without extending the jacks. This takes the weight off the tires. I asked (Paul) Azpete about this procedure and said it is OK.
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Old 07-08-2020, 07:41 AM   #12
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Quote:
Originally Posted by Gary RVRoamer View Post
I've seen that in one of the tire company's RV Tire Guide, but I've forgotten which one.

Goodyear actually recommends 25% over the recommended pis but not greater than the sidewall max load psi. Michelin just says inflate to psi shown on sidewall for max load.


The big Tire Data Book published by the TRA shows inflations of 10 psi above sidewall pressure for some specific situations, so obviously it's an safe thing to do.


Flat spotting is not much to worry about with modern tires. It used to be a real problem with nylon tire bodies and bias ply tires, but that was over 40 years ago now.

Well it's B A C K,

Nylon that is. If you read the material list on tires you will seen Nylon aka aramid as a material in many Passenger and Light Truck tires. Even some ST type have this material under the tread.
This is included primaril to provide improved High Speed performance and better heat resistance.
So you can get some flat spotting in those tires.
Tread rubber also can take a set so even 17.5, 19.5 and 22.5 tires with their thick tread can get flat spotting.
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Old 07-08-2020, 08:27 AM   #13
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Quote:
Originally Posted by Tireman9 View Post
Well it's B A C K,

Nylon that is. If you read the material list on tires you will seen Nylon aka aramid as a material in many Passenger and Light Truck tires. Even some ST type have this material under the tread.
This is included primaril to provide improved High Speed performance and better heat resistance.
So you can get some flat spotting in those tires.
Tread rubber also can take a set so even 17.5, 19.5 and 22.5 tires with their thick tread can get flat spotting.
Glad to see you back, Tireman. I hadn't seen you in some of the other random tire debates on here. Thanks for the unique perspective on this--here I wasn't doing anything to address it.

So, another question--what's the timeline when someone should consider it long term? I'm assuming >3 months or so?
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Old 07-08-2020, 10:08 AM   #14
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Whenever I park my Dutch Star/Spartan/Michelin for several weeks, I put the HWH levelers down such that the whole weight of the MH is NOT on the tires.
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