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Old 09-13-2015, 06:44 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, 06:52 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, 06:58 PM   #3
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Quote:
Originally Posted by SmokerBill View Post
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, 07:07 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, 07:24 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, 07:31 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, 08:32 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, 10:07 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, 10:17 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, 10:28 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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