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Old 10-06-2015, 06:06 PM   #15
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Trouble is, they don't list 295 80R 22.5 Load range H in the drop down menu.

Janet and Todd Legg
2006 Alpine Apex M-40FDQS #75594
2014 Honda CRV w/navi
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Old 10-06-2015, 08:46 PM   #16
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Originally Posted by bcbowers View Post
FWIW ... I found this page on the Yohama site that provides a tire pressure calculator specifically for "truck" tires ...

Did you get it to work? I could not.

Plus it does not have the 295/80R22.5 as a choice so it wont work for Janet and Todd.

I did see a customer today who sold Yok's. The book had an inflation chart but again did not list the 295/80. Found this, but this is also on your sidewall...load capacity that is:295/80R22.5 H 7830@123

Janet and Todd,
I do have a phone number to Fullerton CA......800.423.4544. Tell them you have a technical question....be sure you have the tire pattern correct (104ZR?) and the size. Then tell them you want a load and inflation chart. Have them email it to you. Get it in writing. You have max load, but you need to see what weight the tire carries at 80,85,90,95,100,105,110 and 115psi.

Please let me know how it goes.

Tom, Patty, Hannah "The Big Dog" and Abby Kat, Indianapolis, Indiana 2000 36' FDS 72232 Our Photos
We live out in our old van. Travel all across this land. Drive until the city lights dissolve into a country sky, me and you - hand in hand.
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Old 10-07-2015, 09:41 AM   #17
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I have those Yokohama tires as well. Recently I was getting a valve stem replaced at a Love's truck stop and found that they do not stock a tire rated as high in weight - might be an issue if I ever shred one.
I used to have a formula that you could calculate pressure based off of actual weight vs rated weight - was a ratio with a safety factor added but I don't know where I hid that from myself. I am running 115 in the fronts, and 105 in the rears and they appear to be wearing right to me - for what it's worth.
Tim and Delilah
2004 Alpine Coach, 400 Cummins ISL, 40'
Weatherford Texas
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Old 10-07-2015, 01:02 PM   #18
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Well, I called the number and spoke to a live person who said he was with the car and light truck division. He transferred me over to the commercial account section where I had to leave a detailed message. We'll see what happens next.
Janet and Todd Legg
2006 Alpine Apex M-40FDQS #75594
2014 Honda CRV w/navi
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Old 10-07-2015, 09:49 PM   #19
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I have a 99 American tradition with 295 x 75R x 22.5 TOYO tires that are 5 years old and look to be wearing well all around , they have been filled at 100 psi all around .
the charts from Toyo start at 70 psi and go up to 115
LF tire weight is 4796 lb , RF is 4070 lb ,
LR is 8646 /2= 4323 , RR is 7788 /2= 3694
this puts me at 90 front and 75 rear taking the heaviest side of each axle
most suggest a 10% + buffer , is that 10% weight or 10% psi
weight would put me at 105 psi front and 90 rear
psi would put me at 99 (100) front and 82.5 (85)
big weight difference in left to right is probably due to single slide on left , 40 gal propane tank , kitchen , washing machine all on left , all of our stowables are on right as much as we can
the ride is good and tires seem to have even wear
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Old 10-10-2015, 09:48 AM   #20
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OK; now I'm really confused, (from Dudley-Do)

Prior to getting my back four new Goodyear 295/80R22.5 RV TL16 's installed, I got the bus weighed at my trusty local dump platform scale. It weighed (per axle) 11,300 lbs. front, and 17,860 lbs. rear, for a grand total of 29,160 lbs. This is full fuel, full propane, half water, and a reasonable amt. of personal stuff aboard with about half full basements. The gross wgt. tag says 33,000 lbs., and recommends tire inflation @ 120psi front, and 110psi rear. The dealer who installed the tires was adament about in-flating the tires to the coach mfg. specs, although the Goodyear charts were substantially less; about 95psi rear and 100psi front. Based on the current (underloaded) weight of our coach, the Goodyear chart recommends 80psi front, and 85psi rear. I think the dealer was doing some CYA re: mfg. recom., but then again I'm having some trouble discounting his experience. Maybe I'm making a mt. out of a molehill....
Dudley Do Right
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Old 10-11-2015, 12:45 PM   #21
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My experience (FWIW) is that using the original manufacturer specs causes excessive pressure when driving from typical heat. I use the Toyo tire load specifications which happens to be 105 psi front & 95 psi rear. Hopefully you're using a tire monitoring system (like TST) to observe actual driving characteristics for PSI & temperature. IIWMI'd follow tire load charts.
Bob Bowers (Surprise, AZ)
2003 Alpine Coach 40' FDTS
2014 Jeep Cherokee Lattitude
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Old 10-11-2015, 03:15 PM   #22
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Be aware that the "original manufacturer's specs" ARE correct IF, repeat IF the axle is loaded to its GAWR (Gross Axle Weight Rating) and the same tires/load range as original are used.

If a different tire and/or your actual weight is less than GAWR, then it could well be off. In fact, you HOPE it is off, as that means that your tires are not totally loaded to their capacity/you have some safety reserve.


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