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08-21-2015, 07:18 PM
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#1
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Member
Join Date: Jun 2015
Posts: 74
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How Often do you Air Up Your 22.5 Tires?
So we've had our coach for a couple months now and its mostly been parked, but I noticed last week that the tires were low (low 80's) so I went and aired them up (95psi). We're going to take a trip tomorrow and I'm going around and checking the tires again and low and behold they are back down to about 83-85 PSI all the way around.
If this was one tire I'd be concerned there was a leak or something but I'd like to know if this is normal? We have the Michelin XRV tires.
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08-21-2015, 07:20 PM
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#2
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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Before I got a TPMS I checked them before we left on a trip and every morning while traveling.
Now the TPMS does it for me. I have to add air maybe two times a year if that.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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08-21-2015, 07:24 PM
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#3
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Senior Member
Join Date: Feb 2011
Location: Snowbird - Waterford Mi and Citrus Springs Fl.
Posts: 3,609
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The day prior to any trip.
Mine generally are within just a couple psi of the last time they were filled - as long as there are no big temp changes on the days tires were checked. That WILL affect readings one day vs. another.
__________________
1997 37' HR Endeavor, 275hp Cat, Freightliner
03 CR-V Blue Ox, Ready Brake
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08-21-2015, 07:28 PM
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#4
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Senior Member
Join Date: Jul 2014
Posts: 35,441
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Air them up and spray some soppy water on the valves. Look for bubbles in and around the valves. If leaking in the core, get a tool to snug them up a bit.
If your not comfortable messing with the valves, go to a tire shop for help.
Tires should only loose around 2 pounds per month.
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08-21-2015, 07:31 PM
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#5
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Senior Member
Join Date: Mar 2007
Location: Apex, NC
Posts: 1,857
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My tires stay within 2 psi all year. Your tires are leaking.
__________________
2010 Winnebago Journey Express 34Y
2010 Freightliner XCS (mfd 9/'09)
'07 Saturn Vue V6
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08-21-2015, 07:36 PM
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#6
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Senior Member
Monaco Owners Club
Join Date: May 2013
Location: Burlington, VT
Posts: 563
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I have TPMS and am able to check them before each trip. I find I need to top them off about once per month. Ambient temperatures will change the pressure a few psi so take that into account.
I originally would top off the tires with our coaches air compressor but this became a pia so purchased a small Viar Compressor that works great to top off the tires. Our highest pressure tire is 120 psi.
Trying to find a place to top off the tires was nearly impossible for us.
Stuart
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Stuart & Leslie
08 Holiday Ramb Navigator, 45 ft, Cummins ISX 600, 2014 Cherokee Limited, Cashmere. Roadmaster Sterling, SMI Airforceone. Full-timing since May 2014
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08-21-2015, 07:38 PM
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#7
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Senior Member
Join Date: Oct 2014
Location: Port Orchard, WA
Posts: 4,217
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I think your tires are leaking. Mine will stay at 110 lbs for months on end. Kind of weird that all the tires are leaking the same amount though. We purchased a TPMS for the peace of mind, for the toad particularly. But I would have your tires checked out, losing 10 or so psi in a week is not normal.
__________________
Scot & Laura Kellersberger, U.S. Army (ret)
Newmar 4 wheel drive Dutch Star 3891, SOLD
Now RV'ing on the water in a Trawler!
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08-21-2015, 07:38 PM
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#8
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Senior Member
Join Date: Nov 2011
Posts: 884
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I haven't put any air in our tires for two years. They are still where I set them after the 4-corner weigh-in at Gaffney 2 years ago.
2006 Mandalay 40E, Cummins ISL 400 HP
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08-21-2015, 08:00 PM
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#9
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Senior Member
Join Date: Aug 2010
Location: Oklahoma
Posts: 297
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If you didn't have the valve stems replaced when you bought tires, I bet they are leaking. Mine did.
__________________
Retired Army, Disabled Veteran
Wife, me, and 2006 Coachman Cross Country 372DS makes three, Demco Kar Kaddy SS
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08-21-2015, 08:13 PM
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#10
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Senior Member
Monaco Owners Club Freightliner Owners Club iRV2 No Limits Club
Join Date: Jan 2011
Location: Avon Lake, Oh
Posts: 2,958
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It sounds like you need to either tighten the valves inside the stems, which can be done with a valve stem tool(about 3-5 $) or you just may need new tire valves. The will cost at least $25 per tire. Lots of labor dismounting and remounting tires to do it. If you have those braided valve extensions, they could also be suspect.
__________________
2000 HOLIDAY RAMBLER ENDEAVOR
40 FT--330HP CAT
2 SLIDES-TOAD 2012 focus
Fulltime-Home is where we park it.
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08-21-2015, 08:14 PM
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#11
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Senior Member
Join Date: Apr 2011
Posts: 2,569
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Tires of this size are going to change pressure rather quick due to temperature swings. I used to have 18 on the ground for 5 million miles. You will get accustomed to it soon.
__________________
American Tradition 42R-Cadillac SRX Blue Ox Koni 5050XL MCD Scangauge D Samsung rf197
Fulltime since 2012
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08-21-2015, 08:39 PM
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#12
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Senior Member
Join Date: Jul 2009
Posts: 2,864
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When in the garage and not in use my tire pressures will fluctuate up to 5 psi only due to the weather changes.
I agree with others who say you have leaks. Most likely in the valve stems.
I keep 95 across the rear axle and 105 in the front. One morning before a trip I checked pressure and one inside dual was 35. I aired it up and took it to a tire center and found out the valve stem nut had come loose from the rim and that's where the leak was.
Check them out. What you have is not normal.
And remember, never, never add air to hot tires meaning tires you have driven on during the day. Only "cold" tires in the morning.
Don
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08-21-2015, 08:48 PM
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#13
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Senior Member
Newmar Owners Club Fleetwood Owners Club
Join Date: Jul 2013
Location: DFW
Posts: 1,473
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Yep, 5psi fluctuation if there is a decent temp change is what I see
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2009 Fleetwood Excursion 40E
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08-21-2015, 09:04 PM
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#14
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Senior Member
Join Date: Jan 2014
Posts: 4,669
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I haven't added air to my tires since I got my rig in January. The tire pressure varies 3 to 5 psi depending on ambient temperature, but the tires all stay roughy the same psi relative to each other. It would be odd to have all tires leaking at the same time.
__________________
2023 Winnebago Travato
2023 Airstream Flying Cloud BH 30'
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