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Old 09-13-2015, 05:44 PM   #1
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2 Bad Towmax Tires - switching to LTs - suggestions?

The tread is starting to separate in 2 of my Towmax Tires resulting in some serious bulging at the center of the tread. The date stamp on each tire is 1114, so they're only 1.5 years old with only about 5,200 miles on them.

Plan to purchase 5 new LT tires for our trailer.
Looking to go with LT235/85R16 Load Range E (Towmax are ST235/80R16 LR-E).

I know from reading the forums, that many of you have switched to LT tires.

I'm interested in hearing from those of you that have switched to LT tires, what tires you went with and how you like them.

Thanks in advance for the information.
Tom
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Old 09-13-2015, 05:52 PM   #2
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Think there might be some warranty reparations available?

I just bought and installed a new set of Maxxis RV tires for my TT.
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Old 09-13-2015, 05:58 PM   #3
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Think there might be some warranty reparations available?
Thanks Bill, Yeah, I'm working the warranty issue with Jayco, our Dealership, & Towmax. Hopefully that will come to a satisfactory resolution.
But regardless of that, I need to get 5 new tires before our next trip.
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Old 09-13-2015, 06:07 PM   #4
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Check discount tires online thru ebay They presently have a $100.00 discount on any tire purchase over $400.00 plus free shipping Not sure of the size you need but worth checking I'll be ordering 5 new Maxxis tomorrow. The $100.00 discount is only good till Tuesday
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Old 09-13-2015, 06:24 PM   #5
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I just put Goodyear G614s on my trailer (2014 361REQS). The G614 has a maximum inflation of 110 psi however I am running them at 90 psi. According to Goodyear's inflation/load tables the tires have a capacity of 3300 lbs at 90 psi. I had my rig weighed in July. The wheel weights were: DS front- 2450 lbs, DS rear- 2375 lbs, ODS front - 2850 lbs, and ODS rear- 2925 lbs (DS=door side and ODS=off door side). I would think your trailer weights would be similar. The trailer was weighed loaded as we normally travel with a full fresh water tank and empty black and grey tanks. The stock wheels are rated at 90 PSI according to Jayco. The G614 has a steel belted side wall and is G rated. The tire load ratings are at 75 mph rather than the usual 65 mph for trailer tires. I do have metal valve stems rather than the stock rubber ones. The G614s are not inexpensive but I am told they should have a longer life than regular ST tires. No, I don't drive them at 75 mph...still stay around 62 mph. FYI, the pin weight on my rig is 3025 lbs. I am told Jayco now offers the G614 as an upgrade.
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Old 09-13-2015, 06:31 PM   #6
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My observation (based on no data... only reading on this forum and talking with other owners) is that the TowMax tires start having problems around the 2 year mark...some earlier and others later. I replaced them before any problems occurred.
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Old 09-14-2015, 07:32 AM   #7
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Ok - after doing some on-line research on max load rating of various LT & ST tires, here's what I've come up with.

For LT Tires - LT235/85R16 Load Range E:
Michelin XPS - 3,042# @ 80PSI
Firestone Transforce - 3,042# @ 80PSI
BF Goodrich Commerce AT - 3,042# @ 80PSI
General Graber HTS - 3,085# @ 80PSI
Goodyear SilentArmor - 3024# @ 80PSI
&
Goodyear G614s - 3,042# @ 80PSI; 3,300# @ 90PSI; 3,415# @ 95PSI; 3,550# @ 100PSI; 3,750# @ 110PSI

For ST Tirs - ST235/80R16 Load Range E:
Goodyear Marathons - 3,420# @ 80PSI
Maxxis M8008 - 3,420# @ 80PSI

My rims are stamped for a maximum weight rating of 3,580# put no maximum PSI rating. I've asked Jayco if they can provide me with a maximum PSI rating for my rims, still waiting for a reply.

I have not gotten individual tire weights, but have weighted the trailer on multiple occasions. And taking an average tire weight from those total trailer axle weights give me ~2,950# / tire weight loading.

Guesstimating that the actual weight loading on each tire would be +/-200# of the average weight, which my estimated maximum individual tire loaded weight may be in the range of 3,150#.

I've read that it's preferred to have a tire with a maximum load rating ~20% above your tire's loaded weight.
At a tire load weight of 2,950#, that would be a max load rating of 3,540#
At a tire load weight of 3,150#, that would be a max load rating of 3,780#

So, the results of my analysis is:

The typical LT tires will not give me the maximum load capacity needed.

The only LT tire that will give me the need load capacity is the Goodyear G614s. But I may need to purchase new rims.

The Goodyear Marathon & Maxxis M8008 will give me close to the needed maximum load capacity on my current rims. They both provide a maximum load capacity ~10% above my estimated maximum tire loading.

So, my choices are:
> Goodyear G614s (may need to buy new rims to get to the desired load rating)
> Goodyear Marathons
Or
> Maxxis M8008

Decisions, Decisions.

If anyone has experience with the Goodyear Marathons or Maxxis M8008 specifically the ST235/80R16 Load Range E, I would appreciate hearing from you.

Thanks
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Old 09-14-2015, 09:07 AM   #8
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Another source of information is RVSEF (RV Safety and Education Foundation). The web site is RVSEF - RV Weighing & Safety Education. They have people who are quite knowledgeable about tires and loading. Call or email them.
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Old 09-14-2015, 09:17 AM   #9
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There is another, although more expensive option: new 17.5 wheels and tires. There is another thread on here regarding this. You will have capability far in excess of required and the tires will fit because they are actually smaller in diameter than the current. This gets you into load range G and up (4,800 lbs) a choice of Michelin XTA, Goodyear G114, and Sailun S637. Follow manufacturer inflation chart and, barring something in the road, no more tire woes.

This is the concept I used on my TT (different size, same idea) => tires are at about 75% of capacity. My TPMS shows that they run 5 degrees to 8 degrees warmer than the ambient temperature (i.e., cool).
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Old 09-14-2015, 09:28 AM   #10
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sailor - thanks for the info and link - I'll look into that.

RUSSELL5000 - yeah, I've been following the thread you referred to.
What was your cost to upgrade to 17.5 wheels and tires.

Thanks everyone for your help and suggestions.
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Old 09-14-2015, 10:11 AM   #11
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Quote:
Originally Posted by ROC-REQS View Post
If anyone has experience with the Goodyear Marathons or Maxxis M8008 specifically the ST235/80R16 Load Range E, I would appreciate hearing from you.

Thanks
I had the Goodyear Marathons load range E on my previous 38' 5er and had no problems. HOWEVER, there are plenty of folks in RV-land that would warn you against them. On the flip-side, there are plenty of people who swear by the Maxxis. I'm surprised that you haven't heard from them.
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Old 09-14-2015, 10:28 AM   #12
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ROC-REQS, I have been doing a lot of research regarding tires as HTT has 13” and there are not many options. A few things I have found, with tandem axles you must derate the load capacity of each tire by about 12%, in one of Goodyear’s documents it states up to 20%. This is due to the weight sharing and shock loads from going over bumps and so forth giving a factor of safety not to overstress any the tires.

I do not have the link with me, so I do not know the exact percentages, but was surprised by this information. P rated tires have a side wall strength of about 40% that of ST tires (ok expected) LT rated tires have a side wall strength I think it said of about 80% that of ST tires (I did not know this) and because of the weaker side walls, you must derate the tire. I thought it was by 12 to 20 percent.
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Old 09-14-2015, 03:19 PM   #13
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ROC-REQS,

My trailer is smaller - I just went from 15 inch to 16 inch.

Here is a link with more info: 17.5" Upgrade Information

Looks to me like steel wheels are $150 each, so roughly $800 or $900 after shipping for wheels and lugs. Looks like the Michelin and Goodyear will run somewhere between $400 and $450 each; Sailun around $300 each.

So, far from a cheap date.

One things I did was get a lower priced tire as a spare.
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Old 09-14-2015, 06:42 PM   #14
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I would not own another Goodyear Marathon. Both of my Jayco's had them. My 33' Jay Flight G2 had them and with less than 5000 miles, 3 of the 4 on the ground were separated. My current Pinnacle came with them as well and all 4 were separated. I personally went to Discount Tire a put the TaskMasters that they recommended. G rated, my wheels are like yours with the weight rating vs the psi rating, but the long time manager friend of mine said that he hasn't seen any wheel issues with them. Got metal valve stems, mounted, balanced, and the free replacement warranty for less than $1k for all 4. So far so good, only have 800 miles on them since March, but the rig feels better going down the road than the Goodyear Marathons (Made in China) ever did. If I was someone that traveled all over, then I would of spent the big bucks for the Goodyear G's.
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Old 09-14-2015, 07:26 PM   #15
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You should be able to find the G614 for less than $400. I paid around $320 mounted and balanced last month at a local dealer.
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Old 09-14-2015, 11:57 PM   #16
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There is another G rated tire that a local dealer told me about. It is a Sampson Long Haul 235x85x16 rated over 3700 lbs. He quoted $236 a tire. Don't know much else yet. Anybody using them?
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Old 09-15-2015, 09:50 AM   #17
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Thanks everyone for your help and suggestions.

Decided to go with the Maxxis M8008,
It seems to be the best ST tire out there now and more because of $.

To upgrade to 5 - G614 ST235/85R16 wheels & tires would cost over $2,300 priced at Trailer Tires & Wheels.

And to upgrade all 5 to 17.5" it would cost over $3,200.

Just can't afford that at this time but it's something to save for in the future.
Again thanks everyone for your input and information.
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Old 09-15-2015, 10:39 AM   #18
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Originally Posted by ROC-REQS View Post
Thanks everyone for your help and suggestions.

Decided to go with the Maxxis M8008,
It seems to be the best ST tire out there now and more because of $.

To upgrade to 5 - G614 ST235/85R16 wheels & tires would cost over $2,300 priced at Trailer Tires & Wheels.

And to upgrade all 5 to 17.5" it would cost over $3,200.

Just can't afford that at this time but it's something to save for in the future.
Again thanks everyone for your input and information.
Good decision.
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Old 09-15-2015, 11:05 AM   #19
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For those that might be interested, I believe my TPMS alerted me to the potential tire issue.

I noticed that 2 of the tires were registering lower pressure, but ~4# then the others when cooled down. That is the 2 good tires were reporting 80 PSI and the 2 other tires (ODS Frt & DS Rr) were reporting 76 PSI on the TPM.
76 PSI wasn't low enough to trigger an alarm, but it did tell me that I should do a visual inspection of the tires (and pump them up).
Upon visual inspection I noticed that both tires were starting to bulge.

My guess now is that because of the bulge and tread separation, it increased the internal area of the tire resulting in a lower tire pressure.
Not sure if this is valid, it's just my guess.

Anyway, the lower pressure reading is what caused me to do close inspection of the tires resulting in seeing the bulge and allowed me to avert what could have been a blow-out and potential damage to the trailer.

Proves that there's no substitute for visually inspecting the tires at every stop and before leaving on a trip (along with checking the tire pressure & temps).

IMO our TPMS just paid for itself.
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Old 09-15-2015, 11:05 AM   #20
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Good decision.
Thanks eldermike
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