Forum Discussion

txmerlin's avatar
txmerlin
Explorer
Jun 29, 2019

Need new tires

Need to replace the 5 year old tires on my TT and need some advice about upgrading. The trailer is 38 feet and has a GVWR of #9975 and currently has Load Range D tires from the trailer manufacturer. I want to upgrade to Load Range E for a little extra comfort level (no extra weight) but do not know if the rims are suitable for the additional pressure. I pulled a tire and looked on the back of the rim for some sort of psi marking, but nothing that simple to be found. The rim has 5 spokes and these are what what on the spokes:
1) Tire max load #2150
2) Tire max load #2830
3) A960 15x6J
4) 5H-1143 and 6H-1397
5) Made in Taiwan
Around the center ring there were several QA stamps and the letters DOT-T ET0

I have tried researching the numbers on the 4th spoke and found nothing related to rims. I am a little confused as to why the rim would have 2 Tire max load markings.

Any advice on these rims or do I need to bite the bullet and get some new rims to go with the tires?

Thanks in advance
Ken
  • NWnative's avatar
    NWnative
    Explorer
    Jul 03, 2019
    Goodyear Endurance - Made in USA - For that size, they will be a Load E so you will have plenty of extra margin.
  • myredracer's avatar
    myredracer
    Explorer II
    Jul 03, 2019
    If rims are 6-lug, I'd make a guess they're rated for 80 psi. You probably won't find a psi rating stamped on the rims, but possibly a max. load rating that corresponds with LRE and thus 80 psi. I just had our 6-lug alloy wheels off to do a bearing repack. Rims are made by Sendel and marked 2830 psi. There's a model number on them that I looked up on Sendel's website and confirmed they're 80 psi.

    Without doing the math, I would guess that the ST LRD tires had a rather low reserve load capacity and that LRE would be the right tire to use. I'd also guess that the dual axles are rated 5200 or 6000 lbs with that GVWR, and not the common 3500 lb axles on lighter trailers. I think that's another indication that the rims would be 80 psi rated. You want at least 15% reserve load capacity on ST tires and the new tires will be somewhat higher than that.
  • Grit_dog's avatar
    Grit_dog
    Navigator
    Jul 03, 2019
    DownTheAvenue wrote:
    BurbMan wrote:
    I converted my 15" STs to 16" LTs a while back, and that involved putting a 2" lift onto the suspension. I bought a set of LT rims and E rated tires from a guy who said that even though the rims were stamped "65 psi max" he ran them at 80 psi no problem.

    The clearcoat is peeling off these rims and they look awful, so this time around I bought new wheels and the PSI rating says "Limited to valve stem". The weight rating is more than enough to handle an E tire, and the valve stem for the TPMS I use is rated at 100 psi.

    Here is the same rim in a 15" that says the same for PSI rating. If you don't want to go to LTs, then I would upgrade the rims and get the best E-rated ST tire you can find.


    This is the best advice. Upgrade to 16" wheels and put on "LT" tires and never again worry about your trailer tires.


    Or if a guy isn't into spending a bunch of money to bulletproof something that may not need bulletproofed.

    Slap some new E rated 225s on it. GY Endurance are the new high end tire and have good reviews for durability.
    I've had a couple different sets of Kenda Karriers now that are closer to bargain priced end of the spectrum and they've held up well so far. One set is about 4 years old now I believe.
  • DownTheAvenue's avatar
    DownTheAvenue
    Explorer
    Jul 03, 2019
    BurbMan wrote:
    I converted my 15" STs to 16" LTs a while back, and that involved putting a 2" lift onto the suspension. I bought a set of LT rims and E rated tires from a guy who said that even though the rims were stamped "65 psi max" he ran them at 80 psi no problem.

    The clearcoat is peeling off these rims and they look awful, so this time around I bought new wheels and the PSI rating says "Limited to valve stem". The weight rating is more than enough to handle an E tire, and the valve stem for the TPMS I use is rated at 100 psi.

    Here is the same rim in a 15" that says the same for PSI rating. If you don't want to go to LTs, then I would upgrade the rims and get the best E-rated ST tire you can find.


    This is the best advice. Upgrade to 16" wheels and put on "LT" tires and never again worry about your trailer tires.
  • txmerlin's avatar
    txmerlin
    Explorer
    Jul 03, 2019
    The wheels are cast aluminum with only a 6 lug pattern. The tires are ST 225/70R-15 load range D. The lines I posted above are cast into the back side of the spokes. I have continued looking and have found a chart that references the lower of the 2 tire max weights as load range C @ 50 psi. I have also seen references to the upper weight as load range E @ 80 psi. Is there a reason why they put both on the wheel? Is it a from/to rating? I did go to the local Discount Tire and all that kid could do is punch numbers into a computer. The choices around here for tires are Discount Tire, Wal-Mart and Firestone.
  • CharlesinGA's avatar
    CharlesinGA
    Explorer
    Jul 02, 2019
    txmerlin wrote:
    Need to replace the 5 year old tires on my TT and need some advice about upgrading. The trailer is 38 feet and has a GVWR of #9975 and currently has Load Range D tires from the trailer manufacturer. I want to upgrade to Load Range E for a little extra comfort level (no extra weight) but do not know if the rims are suitable for the additional pressure. I pulled a tire and looked on the back of the rim for some sort of psi marking, but nothing that simple to be found. The rim has 5 spokes and these are what what on the spokes:
    1) Tire max load #2150
    2) Tire max load #2830
    3) A960 15x6J
    4) 5H-1143 and 6H-1397
    5) Made in Taiwan
    Around the center ring there were several QA stamps and the letters DOT-T ET0

    I have tried researching the numbers on the 4th spoke and found nothing related to rims. I am a little confused as to why the rim would have 2 Tire max load markings.

    Any advice on these rims or do I need to bite the bullet and get some new rims to go with the tires?

    Thanks in advance
    Ken


    Are the wheels stamped steel wheels, or aluminum alloy wheels?

    Do these wheels, by strange chance, have two different sets of lug holes. One set being five lug, and a larger diameter 6 lug set?

    It would help to tell us what size the tires are. It will be clearly marked on the tire, something like ST225/75R15

    Did you find the tire max load markings on the TIRE or the WHEEL? As far as the two different loads marked on the tire, read closely, one, the higher number is for single wheel use, and the other is for dual wheel use (two wheels on the same spindle, just like the duals on the rear of a truck). Never seen or heard of two different ratings on wheels, possibly for single vs tandem axles? but again, never heard of such thing.

    Charles
  • BurbMan's avatar
    BurbMan
    Explorer II
    Jul 02, 2019
    I converted my 15" STs to 16" LTs a while back, and that involved putting a 2" lift onto the suspension. I bought a set of LT rims and E rated tires from a guy who said that even though the rims were stamped "65 psi max" he ran them at 80 psi no problem.

    The clearcoat is peeling off these rims and they look awful, so this time around I bought new wheels and the PSI rating says "Limited to valve stem". The weight rating is more than enough to handle an E tire, and the valve stem for the TPMS I use is rated at 100 psi.

    Here is the same rim in a 15" that says the same for PSI rating. If you don't want to go to LTs, then I would upgrade the rims and get the best E-rated ST tire you can find.
  • Huntindog's avatar
    Huntindog
    Explorer
    Jul 01, 2019
    A960 15x6J

    Those numbers mean something. Many years ago, when I was upgrading from C to Ds, I found the chart online. I cannot remember the specifics, but I believe the number of "Js" matter on the PSI.

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