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Old 07-23-2019, 03:21 PM   #1
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New Tires

Just replaced my 5+ year old China made Marathons with US made Goodyear Endurance.

Hitting the road to cooler wx in a couple weeks so will give them a road test.
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Old 07-23-2019, 03:32 PM   #2
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Quote:
Originally Posted by mpsgolf View Post
Just replaced my 5+ year old China made Marathons with US made Goodyear Endurance.

Hitting the road to cooler wx in a couple weeks so will give them a road test.
I see you also have a 28' as do we....When we put on the Endurance last summer, the dealer inflated to 70PSI, which was too stiff for our load...we had some popped rivets, broken hinges, and the the closet door and also shower door came off. (different trips). After talking with GY and reading some on the Forum, we alooked at the GY recommended PSI load chart, and adjusted the pressure to 55lbs (cold); 15K miles later no issues.
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Old 07-23-2019, 03:46 PM   #3
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Good Choice...👍

We are on our second Season...could not be more pleased.👍

As far as PSI...I've found the closer you get to sidewall max, the less heat, the less chance of failure.
TETO

Bob
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Old 07-23-2019, 03:54 PM   #4
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Originally Posted by gypsydad View Post
I see you also have a 28' as do we....When we put on the Endurance last summer, the dealer inflated to 70PSI, which was too stiff for our load...we had some popped rivets, broken hinges, and the the closet door and also shower door came off. (different trips). After talking with GY and reading some on the Forum, we alooked at the GY recommended PSI load chart, and adjusted the pressure to 55lbs (cold); 15K miles later no issues.
I have NO IDEA why AS is putting the MAX PSI on placards. You're correct. Based on the load charts, 80# is WAY over inflated . . .
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Old 07-23-2019, 04:54 PM   #5
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I have NO IDEA why AS is putting the MAX PSI on placards. You're correct. Based on the load charts, 80# is WAY over inflated . . .
So say some...not all.🤓 TETO

Bob
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Old 07-24-2019, 06:40 AM   #6
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My dealer inflated to max too. Presumably because he didn't know the weight?? We discussed though and he agreed you should run psi relative to weight as recommended by manufacturer. 55 is about right for 28’ weight.
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Old 07-24-2019, 09:35 AM   #7
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Quote:
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I have NO IDEA why AS is putting the MAX PSI on placards. You're correct. Based on the load charts, 80# is WAY over inflated . . .
When I inquired "why list Max Pressure" question to AS, I was told because most people "do not know" their vehicle weights; they list "Max Pressure" so as not to over inflate.

I know from my experience's that running with "Max Pressure" (70-80PSI on the GYE's) can/does cause undue vibrations causing rivets/hinge issues in my AS. If your happy running with max pressure, go for it! Many of us follow the load chart. YMMV
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Old 07-24-2019, 09:49 AM   #8
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I do not agree with Bob that running max pressure gives "less chance of failure". I think that as long as the tire is not under inflated for the load there is very little chance of failure and more air does not reduce the failure chance significantly. Screws, nails, under inflation, and maybe just a bad tire are reasons for failure.

I do not run a triple axle trailer. Maybe for them more pressure would be very useful from the point of turning shear and uneven loading. But for a well leveled double axle trailer I would be okay with running less than maximum sidewall pressure.
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Old 07-24-2019, 02:00 PM   #9
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Less PSI translates into more friction and uses up gas. Bouncing could indicate suspesion issues
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Old 07-25-2019, 10:21 AM   #10
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I have NO IDEA why AS is putting the MAX PSI on placards. You're correct. Based on the load charts, 80# is WAY over inflated . . .

By regulation, the tire load capacity must be capable of supporting the GAWR. RVIA now requires that the tires be capable of supporting the GAWR +10%


I think if you do a little research you will see the above is why the certification label specifies the Max cold pressure.

If however, the RV company selected larger tires with more reserve load they could meet Federal regulations and RVIA with less than the tire sidewall pressure.
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Old 07-25-2019, 10:25 AM   #11
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I do not agree with Bob that running max pressure gives "less chance of failure". I think that as long as the tire is not under inflated for the load there is very little chance of failure and more air does not reduce the failure chance significantly. Screws, nails, under inflation, and maybe just a bad tire are reasons for failure.

I do not run a triple axle trailer. Maybe for them more pressure would be very useful from the point of turning shear and uneven loading. But for a well leveled double axle trailer I would be okay with running less than maximum sidewall pressure.

Assuming you read and understood THIS post, could you provide the information that refutes the statement that increased inflation will lower the Interply Shear and thereby would reduce the probability of having a belt separation?
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