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Old 03-15-2013, 10:09 AM   #1
Tom462X0
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Question ST or LT tires on 2005 Montana 2980RL

Hello, I am going to need to put tires on the 2005 Montana 2980RL 5th wheel. We purchased it as a used 5th wheel in 2010. So the tires have been on there since we purchased it. It has on it right now LT 235/85R16E including the spare (looks to be original-sticker still on tread). One of the tires had to replaced due to a leaking problem (bubble in tread area). I wrote to Keystone for advice, they just mentioned the tire size but not whether to install ST or LT tires. Which type do you recommend. We had a little tow trailer and it had ST tires on it. I would think that ST would be a better choice because of the "stiffer" sidewall. I want to call ahead to the tire store to insure they will have the type of tires before we have them replaced.
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Old 03-15-2013, 05:32 PM   #2
chuck&gail
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If it was my TT, and it came with LT's, I'd replace them with LT's.

Again if it was mine they would be non-Chinese tires, with a DOT code no older than 6 months, and balanced with metal valve stems.
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Old 03-15-2013, 05:50 PM   #3
Tom462X0
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ST or LT tires on 2005 Montana 2980RL

It came with the LT's when bought it used, so I have no idea if it came with the ST's or LT's originally. Like I mentioned, Keystone was vague on its recommendation. It looks like I will need to talk to a tire place or RV repair facility like Camping World to get the proper information. Thanks for your input much appreciated.
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Old 03-15-2013, 06:20 PM   #4
f6bits
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I wish I had pictures of mine to double-check, but the sticker at the front corner of my trailer has my tire info. I thought it even listed the standard tires and their recommended pressures.
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Old 03-15-2013, 08:21 PM   #5
CWtheMan
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Look on the left forward exterior portion of the trailer for the certification label. It may also be found on the LH side of the hitch pin housing.

Keystone quit using LRE Light Truck tires on 6000# axles in model year 2006. So I’m pretty sure yours came equipped with LT235/85R16E tires. I also think most posters will advise you to stick with the LT tires.

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Old 04-14-2013, 11:42 AM   #6
FLCapt
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LT tires on my '09

Just replaced the tires on my '09 347 THT, with BF Goodrich Commercial LT 235/85 R 16, E rated. The original Goodyear Marathons ST 235/80 R 16 were still on it- they looked good, but had manufacture dates in mid 2007. Didn't want to take a chance, leaving on a 1000 mile trip this week. I don't expect any problems out of the BF Goodrich's. I keep them inflated properly and keep my highway speeds under 65 mph.
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Old 05-05-2013, 06:28 AM   #7
elkhorn98
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I would go lt. I recently switched from st to lt in the same load range and the lts are way stiffer. I read a lot online and found a comparison of the dot testing on another forum. St don't require as much testing and are intended for occasional non passenger use. If you intend to travel long distances, in hot weather, and near or above the st 65 mph speed limit I would get lt. St have 0 reserve capacity so the load capacity is higher. Lts typically have 20% reserve and are rated to a higher speed like 106 mph. I have heard some tire engineers say if you go for st you should get ones 15-20% overrated. Another thing is most st makers recommended life is 3-4 years while lt are 6-7 years. Don't get caught up in the marketing hype about special uv stuff in st...how many lt tires have you seen rot? Good luck.
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Old 05-05-2013, 07:18 PM   #8
CWtheMan
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Quote:
Originally Posted by elkhorn98 View Post
I would go lt. I recently switched from st to lt in the same load range and the lts are way stiffer. I read a lot online and found a comparison of the dot testing on another forum. St don't require as much testing and are intended for occasional non passenger use. If you intend to travel long distances, in hot weather, and near or above the st 65 mph speed limit I would get lt. St have 0 reserve capacity so the load capacity is higher. Lts typically have 20% reserve and are rated to a higher speed like 106 mph. I have heard some tire engineers say if you go for st you should get ones 15-20% overrated. Another thing is most st makers recommended life is 3-4 years while lt are 6-7 years. Don't get caught up in the marketing hype about special uv stuff in st...how many lt tires have you seen rot? Good luck.
The only acceptable load capacity for any highway tire is molded right into its sidewall.

CW
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Old 05-06-2013, 04:47 AM   #9
elkhorn98
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Cw I totally agree. If you get lt tires sized correctly you should be fine...but a st tire running near its load capacity is a blow out waiting to happen. Imho.
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Old 05-06-2013, 08:01 PM   #10
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Upgrade to a higher load rating. Put 17.5" rims and GY G114's on our Big Sky. Overkill....maybe. Safe......oh yea! First trip out was great.

Running on the high end of the load rating to me is a problem waiting to happen.

Good luck and be safe.
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