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Old 07-22-2018, 03:12 PM   #1
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235/80 to 235/85

Getting new tires. 85 gives me an xtra 220lbs per tire over 80. Which are maxed according to the stickers. Works out to about .4” around. Don’t see it as an issue. Thoughts?
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Old 07-22-2018, 03:35 PM   #2
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Another poster was discussing this same thing a couple of days? ago. Seems the difference in diameter was about 1" in the tire sizes. His comment (and picture) was about how little room there was between the 2 tires once mounted. You might do a quick search and find that, it might be of interest.
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Old 07-22-2018, 03:39 PM   #3
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Old 07-22-2018, 03:48 PM   #4
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If you're talking 16" then they're almost an 1 inch more in diameter.. which equates to raising the trailer a 1/2 inch and decreasing the clearance above the tire by the same.. Also it will decrease the clearance between the tires by just less than 1"

Most likely not of any real consequence.... I'm looking at doing the same thing for a difference reason... mine is... going to the Goodyear Endurance 235/85R16 from Carlisle 235/80R16..

I have to buy another tire to replace one that a fence staple got and the remaining tires or 3516 date code... So now is as good a time to swap them all out (including the TM spare) for a higher load range and higher speed rating.. don't drive over 65 usually but occasionally passing will bump 70+... can't hurt


I'll sell the old tires for $25/$30 to someone for a 4-wheeler trailer..
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Old 07-22-2018, 09:33 PM   #5
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Originally Posted by 336 View Post
Getting new tires. 85 gives me an xtra 220lbs per tire over 80. Which are maxed according to the stickers. Works out to about .4” around. Don’t see it as an issue. Thoughts?
As someone already pointed out, there may not be enough room between the tires for the taller tires. Keystone builds a lot of trailers with 33” axle spacing. You should measure both sides before you commit to the taller tires.

The ST235/85R16 tires come with two load capacity options. The LRE has a maximum load capacity of 3640# @ 80 PSI and the LRF has a maximum load capacity of 3960# @ 95 PSI. Both may have speed ratings of 75 MPH, depending on brand.

Probably the most economical way to go would be to stay with the ST235/80R16 and go up to a LRG. The tire physical size is identical and they will use the same tire inflation chart as the OEM tires.
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Old 07-24-2018, 07:36 PM   #6
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I changed from 235/80 to 235/85 18 months ago with no problems on my 2017 HC 370BR (7000 axles).

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Old 07-25-2018, 04:50 AM   #7
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Getting new tires. 85 gives me an xtra 220lbs per tire over 80. Which are maxed according to the stickers. Works out to about .4” around. Don’t see it as an issue. Thoughts?
That 5er only has a 12,290# GVWR, have you considered going to an LT tire? Yes, lower weight rating than an ST tire, but a far better built tire that has to meet higher quality standards. A LT235/85-16E will have a weight rating of 3,042# which is 12,168# which is just shy of your GVWR, but well over the less than 10,000# that will be riding on the axles.
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Old 07-25-2018, 05:16 AM   #8
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That 5er only has a 12,290# GVWR, have you considered going to an LT tire? Yes, lower weight rating than an ST tire, but a far better built tire that has to meet higher quality standards. A LT235/85-16E will have a weight rating of 3,042# which is 12,168# which is just shy of your GVWR, but well over the less than 10,000# that will be riding on the axles.
NEVER is a strong word and one of the many reasons tire shops won't do load capacities less than vehicle manufacturer recommendations. Below is a reference as to how that manufacturer words their view of tire industry standards for replacements.

Note: This is a size designation, ST235/85R16. The load range is a feature that can vary in that size designation. This is another size designation, LT235/85R16. The load capacity difference between those size designations at LRE is more than 600# in favor of the ST design. Because of the design differences, those two examples use completely different load inflation charts.

https://www.michelinman.com/US/en/he...res.html#tab-4
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Old 07-26-2018, 04:46 PM   #9
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Firm believer in the ST tires belong on trailers group. I know there are lots of points to the argument but I’ve never seen my truck tires look like the ripping apart tipping in opposite directions being drug around in a u turn. ST tires are made for that. Went with the original equip. 235/80. Had the Trailer Kings on for 3 years in that size w no probs. One got a nail and rode low for a while. Ruined the tread on that one and prob stressed the other. Not pushing my luck any further. Carslile trail radial HD in the 235/80 from Walmart should be in tomorrow. Same specs as the TKs and a little better speed rating. 77$.
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Old 07-27-2018, 03:25 AM   #10
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Actually truck tires flex more in sidewall and are designed tougher in that regard. They have to pass tests for steering on the front where trailer tires are fixed position. Think of turning your steering wheel while stopped.
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Old 05-13-2023, 07:35 AM   #11
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I’m curious if you had any issues doing this?
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Old 05-13-2023, 07:38 AM   #12
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Did you ever change your tires to the 235/85/16? I’m looking to do the same thing.
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Old 05-13-2023, 08:03 AM   #13
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Did you ever change your tires to the 235/85/16? I’m looking to do the same thing.
Last time the original poster was on this site was about a month ago.
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Old 05-13-2023, 04:10 PM   #14
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instead of looking at a different size tire, look to go to a better brand. a cheap tire in a 80 is going to have the same issues as a cheap tire in a 85. consider something like the sailun which is stepping up a couple load ranges, but you run it at say 90 psi to give you an increased load range but not the rough ride it would have at its 110 psi capability.
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Old 05-17-2023, 08:42 PM   #15
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Getting new tires. 85 gives me an xtra 220lbs per tire over 80. Which are maxed according to the stickers. Works out to about .4” around. Don’t see it as an issue. Thoughts?
The larger tire is a "plus size" and it invalidates your trailers certification label.
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