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Old 03-15-2013, 10:09 AM
Tom462X0 Tom462X0 is offline
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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
chuck&gail chuck&gail is offline
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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
Tom462X0 Tom462X0 is offline
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Default 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
f6bits f6bits is offline
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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
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CWtheMan CWtheMan is offline
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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 Im 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
FLCapt FLCapt is offline
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Default 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 04-14-2013, 01:26 PM
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IdahoSRT10 IdahoSRT10 is offline
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The LT's like to spin faster and not fly apart at high speeds, but they don't drag sideways while turning as good as the ST's. Keep an eye on your suspension with the LT's.
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Old 04-14-2013, 01:36 PM
cathcartww cathcartww is offline
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Here is a pretty good discussion of ST vs LT ....

http://rvingwithmarkpolk.com/2012/11...s-vs-lt-tires/
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Old 04-14-2013, 01:37 PM
therink therink is offline
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Quote:
Originally Posted by IdahoSRT10 View Post
The LT's like to spin faster and not fly apart at high speeds, but they don't drag sideways while turning as good as the ST's. Keep an eye on your suspension with the LT's.
I just installed my first set of LTs on the new fiver. I have read that on sharp maneuvering turns, there is the potential to break the tire bead or stress the axles. Should I be concerned? Is tight turning on dry pavement the stressor? I just wanted tires I didn't have to worry about. Did I do the right thing? They are Firestone Transforce HT's.
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Old 04-14-2013, 04:25 PM
BeerCan BeerCan is offline
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As long as the tires meet the load rating for the axle, I would not stress about it. In general I think tires with a closed shoulder design such as ribs are better on trailers, but it is not mandatory.

Keep the pressure correct and watch for unusual wear and you should be fine.
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