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Old 10-03-2018, 08:04 AM   #1
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Upgrade From Load Range D to E Tires

My Coachmen Apex trailer came equipped with Constancy ST225/75R15 D tires. I'd like to get rid of this Chinese made tires and upgrade to Goodyear Endurance load range E tires. My question is: will my wheels stand up to the increase in psi from 65 to the 80 required for the E tires. I'm assuming that the wheels are also made in China and worry that they may not stand up to the higher pressure. Any ideas on this? Thanks
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Old 10-03-2018, 08:11 AM   #2
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Likely no. I did the same upgrade to Endurance tires but still run 65 psi as that still provides the load capacity my TT requires. Great improvement in towing.
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Old 10-03-2018, 08:27 AM   #3
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No need to put them at 80. 80 is simply the manufacturers max cold inflation. Look for a load/inflation chart for that particular tire, and go from there. The tires themselves are made stiffer, so unlike the old Dís, you wonít have to have them at max.

I recently upgraded my C rated TT tires to an E rated 10 ply. Looking at the loading chart, shows each tire can carry #2300 at just 60psi. The total is #9200. Thatís more weight then my axles are rated to carry, and less then any possible conflicts with a wheel that may not be rated for 80psi.
My wheels are just a 5 lug aluminum, so I only aired them to 62psi cold. It made a huge difference over the C tires.
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Old 10-03-2018, 08:37 AM   #4
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Opinions will differ on this, but while you are at it, have the wheels balanced at the same time as you swap out the tires. There is a lot riding on our trailer tires and just because you aren't sitting in the trailer when driving or feeling the effects since you aren't "driving" it, doesn't mean they shouldn't be balanced. You want top performance and longevity from your tires, spend the couple dollars to balance them.
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Old 10-03-2018, 09:15 AM   #5
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i agree with using the load inflation charts. However keep in mind that almost no trailer will have the same weight on all the tires, so take the axles weight and divide by the number of tires then add 10-20% and use that to determine the air pressure to run.

If you have not been to a scale use the GVWR-tongue weight to get the axle weight.
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Old 10-03-2018, 09:19 AM   #6
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There have been threads before that said YES they will standup to those pressures...

Lionshead is the name of the supplier of rims and tires to FR. They do have a website. Others have reported that when contacted they said YES, they will handle 80PSI... they supply the same rims for a wide range of trailers.

Just be sure that you upgrade from rubber stems to metal valve stems if you have the rubber ones now.

65 PSI to 80 PSI is not all that great of a pressure increase...

one thing you will notice about the GY Endurance is that they are a heavier tire with a much stiffer sidewall, less prone to flexing, which give truer tracking behind your TV, with less chance for sway due to sidewall flex...

I went from range C to D and I run 62# of pressure...
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Old 10-03-2018, 09:57 AM   #7
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Don't know anything about LIONSHEAD, but my rig came equipped with DEXSTAR branded wheels, 15X6JJ, 6-5.5 , rated at 2830 @ 80 PSI.
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Old 10-03-2018, 10:54 AM   #8
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Quote:
Originally Posted by rsdata View Post
There have been threads before that said YES they will standup to those pressures...

Lionshead is the name of the supplier of rims and tires to FR. They do have a website. Others have reported that when contacted they said YES, they will handle 80PSI... they supply the same rims for a wide range of trailers.

Just be sure that you upgrade from rubber stems to metal valve stems if you have the rubber ones now.

65 PSI to 80 PSI is not all that great of a pressure increase...

one thing you will notice about the GY Endurance is that they are a heavier tire with a much stiffer sidewall, less prone to flexing, which give truer tracking behind your TV, with less chance for sway due to sidewall flex...

I went from range C to D and I run 62# of pressure...


Thank you for this. Iíd seen the discussions and questions, but not a definitive answer.
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Old 10-03-2018, 01:46 PM   #9
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My original tires were D rated and at 65psi 2540lbs which were right at max with loaded trailer. bought new tires E rated and at 80psi 2840lbs which puts me at 11360lbs max and well below trailer max weight. The rims are Hispec with a max of 2840lbs for the model I have but doesn't show max inflation I'm thinking it would have to be 80 because of max weight.
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Old 10-03-2018, 03:15 PM   #10
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I believe the pressure rating is stamped on the inside of the rim
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