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Old 09-11-2020, 10:30 AM   #1
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ST225/75x15 to 235/80x16 Tires

Curious to know if anyone has done this and if any pitfalls from doing so?
I'm satisfied that the factory 15" wheels and tires are borderline adequate. Especially for a toy hauler. I want better.
The 235/80x16 Goodyear Endurance is 2" taller.
Plenty room in the wheel wells.
Rims are zero offset and readily available.
Tire weight carrying capacity goes up by 2000 lbs total. Understand the the axle and trailer gross rating would not change. After tire safety reserve.
Thoughts? Click image for larger version

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Old 09-12-2020, 11:53 AM   #2
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I recommend staying with the same designated size; ST225/75R15 and using the new steel cased LRF with new wheels, steel valve stems & caps.
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Old 09-12-2020, 07:09 PM   #3
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I recommend staying with the same designated size; ST225/75R15 and using the new steel cased LRF with new wheels, steel valve stems & caps.
Rational? I'm interested in your thoughts.
That said, ordered 4 Hispec 16x7 6/5.5 and 4 Goodyear Endurance ST235/80r 16 LRE. 123 for 3450 lbs. Understand that I'm not altering the GVWR. I never cared for the original rims....so here we go. Any excuse will do!
The Liger wheels are (apparently) an upgrade from natural wheels. Unsure of that. We're headed back home tomorrow. Found a spare.
Toy haulers are rough on tires with the axles biased about 2' to the rear.
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Old 09-12-2020, 07:32 PM   #4
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BTW, I got a really good deal on a slightly used Ligen alloy rim....and the tire's free...it was a 15", but probably about 14" now. See above pics for details.
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Old 09-12-2020, 08:34 PM   #5
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Rational? I'm interested in your thoughts.
That said, ordered 4 Hispec 16x7 6/5.5 and 4 Goodyear Endurance ST235/80r 16 LRE. 123 for 3450 lbs. Understand that I'm not altering the GVWR. I never cared for the original rims....so here we go. Any excuse will do!
The Liger wheels are (apparently) an upgrade from natural wheels. Unsure of that. We're headed back home tomorrow. Found a spare.
Toy haulers are rough on tires with the axles biased about 2' to the rear.
I'm surprised you have enough axle spacing for those taller tires. Looking at pictures of your trailer it looks like 32" spacing which will work well.

By the way, those new tires are rated at 3420# at 80 PSI. ST & LT tires use the load range letters for measuring tire load capacities. Here is a GY chart.

https://www.goodyearrvtires.com/pdfs/rv_inflation.pdf
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Old 09-12-2020, 10:10 PM   #6
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Thanks much! The wheels that I bought are 3200 lbs...so anything over that. Sorta...
The specs indicate 16" 235/80 tires are standard. I'm embarrassed to admit it, but I thought it had 16" tires. Duh.
The 15" are maxed out empty. I generally travel light...as in empty grey and black tanks and minimal fresh. Have an 800 lb golf cart that sometimes rides along. I don't 'collect'. All tools and heavy crap rides in the truck bed.
Below is a screenshot of the specs. Note the tire sizes. There's plenty room between the axle centerlines for the Goodyears. It looked funky really with the 15" wheels. . A lot of unused wheel well. Spousey wants to go more and further so hope this works out. Going to add TPMS...might need another mortgage if this keeps up. At least no damage to the trailer. Will look at the bearings soon. They had a bad day
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Old 09-12-2020, 10:15 PM   #7
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Full specs. A 31V can get heavy.

https://www.rvusa.com/rv-guide/2019-...an-31v-tr41048
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Old 09-13-2020, 01:28 PM   #8
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Upgrade

Maybe you can keep your tire size and just upgrade the Load rating . Maybe from an E rating to an F rating or from a F rating to a G rating. Good year tires suck. I had 4 flat tires at 4 different times last fall. My fifth wheel is only 2 years old. I had Goodyear Marathons on mine. I went from an e rating to an F rating and so far no problems except I'm still fixing things that the blowouts messed up! The E rating tires are only 10 ply. The F rating is 12 ply and the G rated is 14 ply. As the more plys you get, the tire actually gets bigger because of the more plys.
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Old 09-13-2020, 01:59 PM   #9
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Agreed. Marathons had issues. Well known.
Goodyear Endurance has a good record so far.
Too late for me. The new wheels and tires are on the way.
We made it home without issue...I might have not been clear on the spare thing, but I had a spare and good jack. My gripe related to not having a spare for our trip home.
Thanks
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Old 09-13-2020, 02:06 PM   #10
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Quote:
Originally Posted by JRBME View Post
Curious to know if anyone has done this and if any pitfalls from doing so?
I'm satisfied that the factory 15" wheels and tires are borderline adequate. Especially for a toy hauler. I want better.
The 235/80x16 Goodyear Endurance is 2" taller.
Plenty room in the wheel wells.
Rims are zero offset and readily available.
Tire weight carrying capacity goes up by 2000 lbs total. Understand the the axle and trailer gross rating would not change. After tire safety reserve.
Thoughts? Attachment 238884

As long as they fit I see no reason not to go to a 16" rim . then you an f are g rated tires but still limited to axle weights
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Old 09-13-2020, 07:59 PM   #11
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It's a done deal. I'm going with 235/80r 16 E rated, 123N tires. 3400+ rated capacity. . The G rated tires require 110 lbs and that can be difficult if stranded. Plus they are rock hard. The Goodyear speed rating is 87 MPH at 80 lbs inflation. That speed thingy could be some of my tire failure problem.
I think it was punctured really. But I get on down the highway with traffic. Beauty of a 1 ton dually with a big engine. I like that.
We returned without additional excitement. Cool.
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Old 09-13-2020, 08:05 PM   #12
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And yes on the axle weight capacity. The 5200 per axle is not modified by tires and wheels. I travel light. Only extraneous weight is the golf cart. Didn't have it last week. 4 Paws sez "no golf cart's."
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Old 09-19-2020, 05:59 PM   #13
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Annnnd the deed is done. Goodyear Endurance ST235/80r 16 are completed and it looks better. A lot better.
Now I'm trying to firgure how program the TST trailer wheel sensors. Reading thru this is tedious. We'll get on with it.
I now have three nice 1 year old ST225/75 15 Castle Rock mounted on Lionshead Liger wheels. These are 2800 lb assemblies. Going on Craigslist.
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Old 09-21-2020, 07:32 AM   #14
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FYI the G rated tires do not require 110 PSI while rolling down the road. I know you've already moved forward with the upgrade and I'm glad you did. However, the manufacturer if those G tires will have an internet available chart that recommends running pressure based on load. After rolling across the CAT scales my 40ft 5er has 12k lbs on the rig so I can and do run 85PSI on 235/85 16s
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Old 09-21-2020, 09:43 AM   #15
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Quote:
Originally Posted by SilhouettePenny View Post
FYI the G rated tires do not require 110 PSI while rolling down the road. I know you've already moved forward with the upgrade and I'm glad you did. However, the manufacturer if those G tires will have an internet available chart that recommends running pressure based on load. After rolling across the CAT scales my 40ft 5er has 12k lbs on the rig so I can and do run 85PSI on 235/85 16s
Well, here we go again.......Load inflation charts are not recommendations. They are standardized reference charts.

Inflating tires to the load carried eliminates the much needed load capacity reserves. Automotive tires have always been required to provide a percentage of load capacity reserves. Trailer tires now have a strong recommendation requiring 10% in load capacity reserves above vehicle GAWRs.

There is no recommendation in FMVSS or tire industry standards that would allow inflation pressures below vehicle manufacturer recommendations without special circumstances.
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Old 09-21-2020, 11:16 AM   #16
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Quote:
Originally Posted by SilhouettePenny View Post
FYI the G rated tires do not require 110 PSI while rolling down the road. I know you've already moved forward with the upgrade and I'm glad you did. However, the manufacturer if those G tires will have an internet available chart that recommends running pressure based on load. After rolling across the CAT scales my 40ft 5er has 12k lbs on the rig so I can and do run 85PSI on 235/85 16s
Agreed. Mine weighs the same. Late last year I replaced my LR E tires with the SAME SIZE LR G tires. OEM sticker on RV says to run tires at 80psi so I run the LR G at 85psi for extra cushion (on advice from my tire expert). The LR G tires have been the best move so far in regards to handling and towing comfort. Have used RV a lot this year and l love this tire change.
If you change tire sizes, use the charts for that size to find the psi with the same load as OEM specs on the sticker.
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Old 09-22-2020, 03:18 AM   #17
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Beware the charts. Most G rated tires are rated for 80/81 MPH. Lowering the pressure also lowers the speed rating.
Goodyear Enfursnce 87 MPH speed rating was one, of several reasons, for going with E rated tires. And having axles rated for 5200 lbs each. The catch 22 is even with G ratings, lowering the pressure reduces the safety factor and speed rating, and increases heat.
Maxxis had confusion over the speed ratings vs tire pressures. Both were safe if properly executed, but often the tires had issues at max rated speed when less than fully inflated. They solved the misunderstanding by setting a lower max speed.
No one's going to drive at 80+ MPH while towing a TT...but that high speed rating is a safety cushion.
One other observation. The tire pressure recommendations on the RV are only applicable to the OEM tires. A "G" rated tire should use whatever the tire chart for that specific manufacturer and load vs pressure vs speed vs heat they recommend.
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Old 09-22-2020, 03:26 AM   #18
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How does one edit, or delete offensive posts? Moderator only? I must be about half logged in? Can't even 'like' a post.
Anyway. The above gibberish should have read "Endurance".
Cheers
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Old 09-22-2020, 04:38 AM   #19
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Another thought. 6 lug RV wheels are generally rated at about 3200 lbs capacity. Also, in order to utilize G rated tires benefits, the wheels must be rated for 110 lbs pressure, and whatever max load the tires are rated for. The axles are also limitin...or not.
G rated tires are best suited to 8 lug wheels. I would assume most large 5vers have such?
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Old 09-22-2020, 09:20 AM   #20
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Another thought. 6 lug RV wheels are generally rated at about 3200 lbs capacity. Also, in order to utilize G rated tires benefits, the wheels must be rated for 110 lbs pressure, and whatever max load the tires are rated for. The axles are also limitin...or not.
G rated tires are best suited to 8 lug wheels. I would assume most large 5vers have such?
I thought that 3200# wheel load was a little high. I looked at all 15X6 wheels in two of my major references. They all max-out at 2830# - 2860#.

https://www.tredittire.com/wheel/spoke-steel/
https://www.lionsheadtireandwheel.com/
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