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Old 02-08-2017, 10:09 PM   #1
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Toyo tire pressure

Hi...made the move to replace my old michelin 235X80x22.5 tires on my workhorse 22k chassis.with toyos..245x75x22.5...what is the proper tire pressure for these tires?...the dealer put 100 lbs ...to me..seems high...the placard inside says to put 85 lbs..of course that was with the michelins...any thoughts?.the price was great...thanks
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Old 02-08-2017, 10:21 PM   #2
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I run the same tires, and yes 100lbs is too much, those Toyos are great tires!!

For my RV 85 front 90 rear that after I weighed my RV


My weights Front 7180 Rear 13860
Attached Files
File Type: pdf Toyo Tire Inflation Table.pdf (516.6 KB, 74 views)
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Old 02-08-2017, 11:24 PM   #3
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Quote:
Originally Posted by brelph View Post
Hi...made the move to replace my old michelin 235X80x22.5 tires on my workhorse 22k chassis.with toyos..245x75x22.5...what is the proper tire pressure for these tires?...the dealer put 100 lbs ...to me..seems high...the placard inside says to put 85 lbs..of course that was with the michelins...any thoughts?.the price was great...thanks
For proper inflation for safety, ride comfort, handling, and tire life you need weigh the coach. Ideally each corner individually, but per axle will will do. Then use the manufacturers load tables to determine tire pressure.
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Old 02-09-2017, 09:46 PM   #4
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Weigh, read the table CJ7365 gave you, inflate accordingly.
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Old 02-09-2017, 11:04 PM   #5
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I do remember weighing the front and rear as well as the corners about 10 years ago.If i had used michelins recommendations the pressure would have been 75lbs on each ..so i stayed with the inside manufactures 85lbs....i"m going to hunt it up..I do think the 85 front and 90 on the rear sound closer to what they should be..
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Old 02-10-2017, 02:20 AM   #6
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Some tire dealers feel 100psi is a "sweet spot" as I was told by the tire guy. Gets you out the door safely, but maybe not the best ride for your coach. I feel previous posts are right on. We axle weighed and then downloaded the tire charts from Toyo. (didn't see much difference from the replaced Michelin tire charts) I would just add to leave a margin for loading error for safety. Interesting what a 5 psi difference can make in ride, while still being at a safe psi.

But after trying different pressures , the 100 psi on our 40 ft DP actually worked pretty darn good and is a good starting point for "that" size of coach. (placard is 110 front and 95 rear) Driving at 110 front with the Michellin or Toyo was like driving on wooden wagon wheels! OK, maybe a bit exaggerated
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Old 02-11-2017, 10:10 AM   #7
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You can't use the psi on the original tire placard because you have changed tire size, so use the actual or estimated loaded weights and the Toyo inflation table to determine the correct psi. Err on the high side - you never want to be low!

If you can't get to a scale, estimate the weight on the tire by taking 1/2 the axle GAWR and adding a fudge factor because chances are the weight isn't split 50/50. I usually add 5-10%, e.g. if the axle GAWR is 10,000 lbs, half is 5000 and +10% brings it to 5500 per tire. On the rear, its 4 tires so dived by 4 instead of two.
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Old 02-11-2017, 08:55 PM   #8
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well,I found my weight#'s...10 years ago..about 1/3 filled..7100 front 13,200 rears....a lot more has been added since then...I think i will error on the high side with 86 front 90 rear....dont want those rear ones kissing...
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