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05-05-2011, 08:58 AM
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#1
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Junior Member
Join Date: May 2011
Posts: 3
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Tire pressure???
My tires only have a maximum psi (65)cold. I'm trying to find the best operating psi?
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05-05-2011, 09:36 AM
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#2
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Senior Member
Outdoors RV Owners Club
Join Date: Oct 2003
Location: Hillsboro, OR, USA
Posts: 1,293
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Unless you can find the mfgs load/inflation data, or your TT mfg has a reccommended inflation - you should use the information on the sidewall of the tire - ie the max pressure.
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2017 Chevy 2500HD LTZ DuraMax Diesel Silver Ice Metallic
2017 Outdoors RV Timber Ridge 25RDS Mountain Series 4X Off Road Suspension Pkg
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05-05-2011, 10:12 AM
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#3
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Junior Member
Join Date: May 2011
Posts: 3
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Thanks Randy
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05-05-2011, 11:38 AM
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#4
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Senior Member
Join Date: Jul 2005
Location: Pahrump, NV
Posts: 329
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You'll also need to know the weight placed on each tire position & axle in order to adjust the PSI.
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2011 Airstream Classic Limited
2011 GMC Sierra 2500HD Duramax/Allison
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05-05-2011, 11:59 AM
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#5
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Senior Member
Join Date: Jan 2011
Location: Fall City, WA
Posts: 531
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Here's the quick and simple method to check for proper operating pressure:
Get an infrared (IR) temp gauge at Sears, HD, etc. When the tires are warmed up from driving, take a tempurature reading at each tire tread outer edge, and in the center of the tread. (3 shots per tire) If the outer temps are hotter than the center, the tire pressure is too low. If the center temp is higher, the pressure is too high. General numbers are about 1-2 psi difference for every 5 F temp difference.
This procedure should take all of three minutes to accomplish. The IR gauge is extremely handy to have around as well.
For those interested in having their RV handle as well as it can, these numbers are very useful for correcting toe-in, camber, etc.
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2012 Montana 3582RL
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05-06-2011, 07:26 PM
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#6
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,903
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If you have ST-Special Trailer tires they must be inflated to sidewall maximum. http://www.carlisletire.com/product_...are_safety.pdf Carlisle Tire(top page 2) thinks this is so important they void the warranty if operated otherwise.
Nearly all OEM trailer tires are operating withing 10% of their maximum weight rating, thus the sidewall maximum inflation recommendations.
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2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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05-06-2011, 07:46 PM
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#7
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Registered User
Monaco Owners Club
Join Date: Jan 2011
Posts: 949
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120F Is What We're Looking For
Quote:
Originally Posted by Automobilist
Here's the quick and simple method to check for proper operating pressure:
Get an infrared (IR) temp gauge at Sears, HD, etc...
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The result should be around 120F. According to another thread, damage may occur when the temp is above 180F.
I don't like inflating the tires to maximum: it is hard on the suspension, harsher riding, probably a greater chance of loosening your nuts. On the wheel, of course.
My hourly safety check is with an IR gage that cost me $15. I was 4 PSI low in a dolly tire, the temp registered 147F, compared to 120 +/- 10 on all the others.
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05-06-2011, 07:53 PM
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#8
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Senior Member
Join Date: Aug 2004
Location: Wherever we are
Posts: 4,288
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RVNeo--
Do I read you correctly that you stop hourly for a safety check?
Joe
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'16 40QBH Phaeton
'21 Sahara HA toad
'15 38RSSA Mobile Suites--traded
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05-06-2011, 10:56 PM
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#9
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Senior Member
Join Date: Sep 2009
Posts: 1,536
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Quote:
Originally Posted by dhenning
My tires only have a maximum psi (65)cold. I'm trying to find the best operating psi?
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It's on your tire placard. It's also in your owner's manual.
FastEagle
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05-08-2011, 12:25 PM
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#10
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,903
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Quote:
Originally Posted by RVNeophytes2
My hourly safety check is with an IR gage that cost me $15. I was 4 PSI low in a dolly tire, the temp registered 147F, compared to 120 +/- 10 on all the others.
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That alone is an excellent reason to keep ST tires inflated to sidewall maximum. Then there is the warranty issue.
__________________
2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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05-09-2011, 01:10 AM
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#11
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Senior Member
Monaco Owners Club Vintage RV Owners Club Holiday Rambler Owners Club
Join Date: Mar 2008
Location: Klamath County, Oregon
Posts: 245
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Quote:
Originally Posted by Ray,IN
That alone is an excellent reason to keep ST tires inflated to sidewall maximum. Then there is the warranty issue.
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It's an even better reason to change to LT tires on your trailer. Even 120 degrees is and indicator that your tires may be overloaded. When I travel I periodically stop and check my tires. They are never more than warm to the touch. At 120 degrees, it would not be possible to keep your hand on them for more than about a second.
It had never occurred to me to use a laser thermometer to check my tires. Thank you for the suggestion. I'll throw mine in the truck next time I hit the road.
JP
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Jim Price
curmudgeon: noun; a crusty, ill-tempered, irascible, cantankerous old person . . . .
79 27' Holiday Rambler Statesman, 78 32' HR Imperial, 85 36' HR Imperial 5th Wheel
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