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Old 09-23-2019, 06:05 PM   #1
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Tire pressure deviation

Background:
2014 Aspire with Michelin 295’s on the front. Tires are about 2-3 years old. Yokohama’s on rear are new and don’t deviate in pressure like my front ones do.
My recommended front tire pressure is 119.
This was based on a four corner weight done when we picked up the coach and done by the tire shop.
I’ve noticed we lose about 1lb a week sitting and during our recent trip out to South Dakota, we dropped about 2-3 lbs per tire over the course of driving.
I am using the EEZE TPMS and am always monitoring.
My question is, what amount of tire pressure deviation is “normal”?
I figure a lb or two might be ok but I will inflate as often as I need to to be safe.
Tom
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Old 09-23-2019, 06:26 PM   #2
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I adjust mine around 3 - 5 lbs plus or minus (cold)
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Old 09-23-2019, 07:16 PM   #3
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My Michelin 365s and 315 holds pretty constant with equal outside ambient air. I have an outside dual tire that seems to drop pressure about 5 or 6 pounds as read on my Valor TPMS, and that is not good to have unequal pressure in two tires in a pair on one side of a drive axle..... but when I check it with a good tire pressure gauge, I find that the problem is that my one monitor / transmitter on that tire changes.... not the actual air pressure. When it gets to more than ~ 3 psi difference with its pair, I check it with the truck tire gauge and they are the same.... so its the sensor that changes, not the tire.

Now to answer your question in a tire pair, I get nervous when the difference is greater than about 3 PSI.

Gary
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Old 09-23-2019, 09:00 PM   #4
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On my Aspire with Michelins on the front (295s) my pressures stay very consistent. In fact on this 2 month trip, my tire pressures have stayed spot on.
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Old 09-24-2019, 07:22 AM   #5
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My general feeling is to error on the safety side and always check and adjust prior to travel. Any deviation more than 2lbs will be corrected.
Question: is this something Spartan would look at while we are there for our class or should I have this addressed by a tire shop?
When we get down to ATL, we will have the Retro Bands installed.
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Old 09-24-2019, 09:26 AM   #6
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Quote:
Originally Posted by bevandtomH View Post
Question: is this something Spartan would look at while we are there for our class or should I have this addressed by a tire shop?
Hi Tom,

If the Spartan class you're referring to is the Spartan Academy AND if there's been no change to the curriculum since I attended in June 2018, there IS a section dedicated to tires. During the course of the chassis inspection that's included in the Spartan Academy, a corner weigh is accomplished. In a subsequent classroom session, they will address proper inflation, tire wear, effect of alignment on tire wear, effect of ride height on alignment, etc. They'll offer a calibration of a tire pressure gage that you provide. Well, it's sort of a calibration. They've got a K3 chassis in the classroom. They'll check the pressure on one tire with their laboratory calibrated gage to confirm the pressure and then let you use your gage to check its accuracy against their calibrated gage. I brought a several of my gages and found a couple to be off by a few psi and one to match, exactly, their gage.

Take care,
Stu
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Old 09-24-2019, 09:31 AM   #7
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Several years ago I bought a calibrated gauge at NAPA. I only use it to set one tire and then check my others against it. I threw one gauge away since it was too far out.
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Old 09-24-2019, 09:52 AM   #8
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Hi guys,

Good to know about that, yes, we are going to Chassis School and looking forward to it. I will add this to my list of things to check/inspect.

Stu/Mr. D- Interesting on the gauges, I noticed my cheapo tire gauge read fairly accurately but my Viair fancy gauge is off by 3+ lbs. I bought a better tire gauge from our local truck tire place and use that along with my TPMS to determine how much air is needed.i will bring them what I have and calibrate.

Les- on a side note, we saw our sister coach on I-90 last week and thought maybe it was you but I see you were out west.
Thanks again.
Tom
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Old 09-24-2019, 10:06 AM   #9
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I haven’t had to add air to any of my tires, except bicycle, for six months and they’re still good.
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Old 09-24-2019, 10:51 AM   #10
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What tires are you on Rollin101?
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Old 09-24-2019, 11:36 AM   #11
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Quote:
Originally Posted by Motang View Post
What tires are you on Rollin101?
Michelin 365 on front and 315 on drive and tag. Bontrager on bicycle.😀😀
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