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07-12-2014, 07:13 AM
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#1
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Member
Winnebago Owners Club LA Gulf Coast Campers
Join Date: Jun 2014
Posts: 86
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4 Corner weights
When you weigh your MH one corner at a time to calculate tire pressure do you air up each tire with a different pressure or the same air side to side, or front to back. I probably should know this but I am new to this and still learning. Thanks, Cork
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07-12-2014, 07:40 AM
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#2
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Member
Winnebago Owners Club Freightliner Owners Club
Join Date: Mar 2008
Location: Melbourne, FL
Posts: 89
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Use same pressure (highest) side to side on same axel. Different axles may have different pressures according to chart. Usually the charts will give instructions about this.
John Abbott, Melbourne, FL
2015 43' Winnebago Tour
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07-12-2014, 09:32 AM
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#3
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Senior Member
Newmar Owners Club Freightliner Owners Club
Join Date: May 2012
Location: Today? Clayton, North Carolina
Posts: 5,093
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Determine the proper inflation pressure for the heaviest tire (or pair) on each axel, then apply that same pressure to all tires on that axel.
__________________
John and Diane (RIP Lincoln, 21 FEB 22) RVM103 NHSO
Fulltimers since June, 2012
2002 Dutch Star 40, Freightliner, Cat 3126, 2004 Element
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07-12-2014, 10:51 AM
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#4
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Senior Member
Join Date: Nov 2009
Location: Warren, Oregon
Posts: 2,559
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The best way to get a true reading on coach weights is to have a 4 corner weigh. This is where they place your coach on 4 scales at one time to get a true reading, cost $60.00 Mine was done by (Weigh to Go) at an FMCA Rally.
My tires are 295/80R22.5 and comes in at 94%(under)730lbs in the front and 106%(over)1150lbs rear Total wt 12470lbs Front--21150lbs Rear and was told to run 105PSI Front and 100PSI Rear.
RF-6405lbs=LF-6065lbs RR-10195lbs=LR-10955lbs
2 stroker
__________________
2006 Country Coach Inspire 360 40ft Genoa Designer Series, Samsung 197 RR
Cat C9--STEEL & COPPER Bolt Together Radiator w/ updated rubber mounting
SilverLeaf 330 Magnum 2812 PSW 2011 Ford Edge Sport-Air Force One
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07-12-2014, 11:24 AM
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#5
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Senior Member
Damon Owners Club Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 24,024
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There are two schools of though, Some folks say to air both sides the same, I say air all tires per their load..
Reasoning: Epically on the drive axle.. The pressure in the tire will affect the tire size (Circumference, the largest night at the round table, Sir Cumference)
And you want the tires on the two sides to be the same size, so air them up per the chart.
Alas, in my case, don't matter, all tires air to max for this rig.
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Home is where I park it!
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07-12-2014, 11:27 AM
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#6
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Moderator Emeritus
Join Date: Oct 2011
Location: In a lawnchair
Posts: 11,993
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Follow the tire manufacturer's recommendation. Ours are aired the same (highest).
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07-12-2014, 12:20 PM
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#7
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Senior Member
Join Date: Sep 2012
Location: Tasmania now, USA/Canada/Alaska in April
Posts: 2,473
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Michelin have full instructions for tyres on RVs and they say air tyres on the same axle to the pressure dictated by the load on the heaviest side.
I would be concerned if tyres were of a load rating that needed the maximum allowable pressure to support the load. Doesn't leave much margin for extra load.
__________________
Tony Lee - International Grey Nomad. Picasa Album - Travel Map
RVs. USA - Airstream Cutter; in Australia - MC8 40' DIY Coach conversion & OKA 4x4 MH; in Germany - Hobby Class C; in S America - F350 with 2500 10.6 Bigfoot camper
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07-12-2014, 02:36 PM
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#8
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Senior Member
Join Date: Nov 2010
Location: Lake City, Florida
Posts: 450
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Wetsnail
Its hard to find a public scale to do a four corner weighing because often there is no room and/or so many are raised. That will tilt the coach towards the low side (off scales) and skew the weighing. Google scales near you. Check with DOT or State Police in your area to see if they can perform one, or look on this site for a rally near you: RV Safety & Education Foundation
Every manufacturer I have read about wants the same psi in all tires on the same axle. Without a four corner weighing, we are assuming the coach is balanced side to side. If it isn't, and many are not according to the folks at Josams in Orlando, it can lead to under inflation on the heavy side.
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Frank W. '09 Cayman 38 SBD '08 CRV
Lake City, Florida
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07-16-2014, 08:20 PM
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#9
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Senior Member
Fleetwood Owners Club Workhorse Chassis Owner
Join Date: Feb 2000
Location: San Jose, Ca, USA
Posts: 2,697
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Quote:
Originally Posted by 2 Stroker
The best way to get a true reading on coach weights is to have a 4 corner weigh. This is where they place your coach on 4 scales at one time to get a true reading, cost $60.00 Mine was done by (Weigh to Go) at an FMCA Rally.
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We're lucky - if you're in the San Jose, Ca area you can go to Leale's RV for service and they'll give you a 4-corner weigh for FREE!
__________________
Alan Hepburn - San Jose, Ca
2007 Bounder 35E being pushed by a 2020 Jeep Gladiator Sport S or a 2022 Jeep Wrangler Unlimited (JLU) Sport S
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