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Old 10-01-2017, 04:23 PM   #1
SMCrane1554
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Default proper tire pressure for 3326

We own a TM 3326 with new Goodyear Endurance ST215/75R14 tires. Discount Tire inflated them to 60 lbs. Max pressure is 65 lbs. The TM manual says 14" tires should be inflated to 50 lbs. Can anyone clear up my confusion?

Stewart Crane
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Old 10-01-2017, 04:51 PM   #2
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Default question answered

Found the tire specs decal on the side of the TM
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Old 10-01-2017, 08:10 PM   #3
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Quote:
Originally Posted by SMCrane1554 View Post
We own a TM 3326 with new Goodyear Endurance ST215/75R14 tires. Discount Tire inflated them to 60 lbs. Max pressure is 65 lbs. The TM manual says 14" tires should be inflated to 50 lbs. Can anyone clear up my confusion?

Stewart Crane
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Originally Posted by SMCrane1554 View Post
Found the tire specs decal on the side of the TM
Use max according to tire sidewall, IMHO.
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Old 10-01-2017, 08:35 PM   #4
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I have the same tire. I inflate them to 65. But if I was not driving at times over 65 MPH, I would inflate them to 55 PSI. But I run my tires with extra PSI's

The right answer is read the goodyear tire chart below and calculate what your PSI should be. You should inflate them to the right PSI per the load that you will be carrying on each tire. Don't forget to reduce your tongue weight.

Goodyear a few years ago had a service bulletin stating that if you were going to travel faster then 65 MPH to add 10 PSI to the inflation chart. That is what I have done with my tires because at time to time im over 65
MPH.
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File Type: pdf rv_inflation.pdf (506.1 KB, 128 views)
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Old 10-01-2017, 10:26 PM   #5
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I guess the 14 inch rim is load-range "D" then. I have the 15 inch one and it's load range "E", and has this big honking "80 PSI" in a circle molded into the sidewall! Discount Tire pumped it up to 70. I pumped it up to 80. I think the side in the sun got to 94 PSI when being pulled on a hot day. I have steel rims and can't find a pressure rating for them.
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Old 10-02-2017, 07:32 AM   #6
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At 80 psi a tire has no compliance and will rattle everything inside the trailer. 65 has some and is the peak for LR D. At 65 mine have a load rating well over 4,000 lbs.
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Old 07-22-2018, 11:37 AM   #7
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Quote:
Originally Posted by tentcamper View Post
I have the same tire. I inflate them to 65. But if I was not driving at times over 65 MPH, I would inflate them to 55 PSI. But I run my tires with extra PSI's

The right answer is read the goodyear tire chart below and calculate what your PSI should be. You should inflate them to the right PSI per the load that you will be carrying on each tire. Don't forget to reduce your tongue weight.

Goodyear a few years ago had a service bulletin stating that if you were going to travel faster then 65 MPH to add 10 PSI to the inflation chart. That is what I have done with my tires because at time to time im over 65
MPH.
If the load is per tire, should we divide the load by the number of tires on the Trailmanor? For example, if my TM weighs 3500 lbs, and it has 4 tires, wouldn't the load be 875 lbs/tire?
Thanks,
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Old 07-23-2018, 08:47 AM   #8
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The best way, is to get the weight on each tire is with a scale. You will not find the weight on all 4 tires the same because of the balance and load. Since most people, including myself never get the weight of each tire. I'm sure a TM the street side is much heavier with the fridge, kitchen sink, bathroom, water on the street side.

If you don't know the weight on each tire. I think it is recommended to use: Load less tongue weight, divided by numbers of tires, times somewhere between 1.15 and 1.25to to adjust for the load and balance and to have a safety factor. I use 130.0%
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Old 06-27-2022, 07:56 PM   #9
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Didn’t the 3326 come with 13” tires? Did you have to install a lift for the 14” ?
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Old 06-27-2022, 08:59 PM   #10
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Quote:
Originally Posted by robtherod View Post
Didn’t the 3326 come with 13” tires? Did you have to install a lift for the 14” ?
Depends on the year. My 2007 3326 has 14” wheels. Later ones might’ve had 15” wheels. You might really be overthinking this upgrade. What size are your 13” tires?
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