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Old 10-28-2016, 12:52 PM   #1
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Tire load rating vs trailer weight

so I need some help, My Wildcat came with 205/75R15 load range C tires, the tires state they hold 1820 lbs, adding all four tires I get 7280 lbs. My trailer GVWR 7620. To me this is a deficit of 340 lbs, the manufacture says these tires are certified by NTSB to be correct for the vehicle. An I supposed to subtract the tongue weight from my weight calculations ?
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Old 10-28-2016, 12:54 PM   #2
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Yes subtract tongue weight.....
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Old 10-28-2016, 02:15 PM   #3
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Thanks

Thanks, guess that puts me in the green as far as weight goes, just barely
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Old 10-28-2016, 02:29 PM   #4
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Thanks, guess that puts me in the green as far as weight goes, just barely


Correctly loaded, you should have a MINIMUM of 10% of the trailer weight as tongue weight. Take this to the maximum the trailer should ever weigh (GVWR), and you should have 762 lbs of tongue weight and 6,858 lbs on the axle. This should give you 422 lbs minimum of buffer. By not maxing out to GVWR or going more than 10% tongue weight and your buffer increases.
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Old 10-28-2016, 03:19 PM   #5
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Correctly loaded, you should have a MINIMUM of 10% of the trailer weight as tongue weight. Take this to the maximum the trailer should ever weigh (GVWR), and you should have 762 lbs of tongue weight and 6,858 lbs on the axle. This should give you 422 lbs minimum of buffer. By not maxing out to GVWR or going more than 10% tongue weight and your buffer increases.
Thanks, that doesn't seem like a great safety margin judging by some of the threads I have read, but it gets FR off the hook.
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Old 10-28-2016, 04:33 PM   #6
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And that exact reason is why I upgraded to D rated after I did the math on my unit.


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Old 10-28-2016, 04:39 PM   #7
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Correctly loaded, you should have a MINIMUM of 10% of the trailer weight as tongue weight. Take this to the maximum the trailer should ever weigh (GVWR), and you should have 762 lbs of tongue weight and 6,858 lbs on the axle. This should give you 422 lbs minimum of buffer. By not maxing out to GVWR or going more than 10% tongue weight and your buffer increases.
The tongue weight on a 5er should be between 17 and 25% of the gross weight, that's how they get by with a "C" rated tire. If I were the OP I would move up to the "D" or even "E" if the rim can hold the the "E" PSI...
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Old 10-28-2016, 07:13 PM   #8
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Yup, *just* enough. That is how they design and build them. Violently agreed that a bit of safety margin would be appreciated.
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Old 10-28-2016, 07:46 PM   #9
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Mine had C rated tires from the factory. After about a year I upgraded to load range E tires and added a TPMS system. MUCH less stress and worry.
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Old 10-28-2016, 08:44 PM   #10
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What is TMPS ? I plan on upgrading at least to "D" if not E.


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Old 10-28-2016, 09:58 PM   #11
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Tire Pressure Monitoring System
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Old 10-29-2016, 12:46 PM   #12
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I upgraded my E rated to G614's with less than 1000 miles on them. Peace of mind and our crappy pot holed roads made it a no brainer for me.
Just make sure your rims are rated for the increase psi. I was lucky and mine were rated for the G rating. This surprises me because FR and others are always looking to save a few bucks. Maybe they know many people are going to upgrade and did us a favor ?
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Old 10-29-2016, 01:55 PM   #13
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Yes- what he said. Many c rated wheels are rated to 60 psi. I just run my d tires at 60 psi.


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Old 10-29-2016, 04:38 PM   #14
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What is TMPS ? I plan on upgrading at least to "D" if not E.


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Old 10-30-2016, 11:54 AM   #15
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Tire load rating vs trailer weight

How do you know what the rims are rated for, as far as tire size and PSI???
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Old 10-30-2016, 12:12 PM   #16
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How do you know what the rims are rated for, as far as tire size and PSI???
It should be stamped on the inside of your rims. My rims were stamped 3750 which is good for a G rated tire even though FR only put E rated tires.
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Old 10-30-2016, 02:19 PM   #17
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How do you know what the rims are rated for, as far as tire size and PSI???
If you have these rims on your Rockwood here it is, most use this rim also flagstaff. Most of the time as mentioned the PSI is stamped on the inside.
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File Type: pdf Rockwood rims (1).pdf (228.4 KB, 84 views)
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Old 10-30-2016, 02:39 PM   #18
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Originally Posted by knot-my-fault View Post
so I need some help, My Wildcat came with 205/75R15 load range C tires, the tires state they hold 1820 lbs, adding all four tires I get 7280 lbs. My trailer GVWR 7620. To me this is a deficit of 340 lbs, the manufacture says these tires are certified by NTSB to be correct for the vehicle. An I supposed to subtract the tongue weight from my weight calculations ?
They never install the correct rated tire for the units . all come maxed out from the factory . TW works good on paper but not in the real world. out on the road where there will be times when all the weight of the TT is on it's own tires . always go with a better Rated tire . if you have C then D but E will work . your rim should have a weight stamp on the inside rim indicating max weight for the wheel . get a tire to match max weight and fill the tire manufactures max psi . on my unit it came with D rated not even close to carrying the full weight of my TH loaded . so i went up to E now i have almost a 2000lbs margin of safety
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Old 10-30-2016, 05:00 PM   #19
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I went from LRCs to LRDs Maxxis tires and run a TPMS. I researched going to LREs but after discussing with the tire expert on this forum he said I'd be better off running LRDs because at the weight of my rig the wheel/axle combo is not really suited for the LREs. The weight of the trailer would be running the LREs under-inflated and that is bad, whereas running the LRDs more towards max air pressure.

My rig is light @ ~9klbs, so running the LRDs is fine.

I originally thought going with the highest rated tire would be the best choice, just a few bucks more, but I found out otherwise. Your mileage may differ...
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Old 10-30-2016, 05:21 PM   #20
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I went from LRCs to LRDs Maxxis tires and run a TPMS. I researched going to LREs but after discussing with the tire expert on this forum he said I'd be better off running LRDs because at the weight of my rig the wheel/axle combo is not really suited for the LREs. The weight of the trailer would be running the LREs under-inflated and that is bad, whereas running the LRDs more towards max air pressure.

My rig is light @ ~9klbs, so running the LRDs is fine.

I originally thought going with the highest rated tire would be the best choice, just a few bucks more, but I found out otherwise. Your mileage may differ...
Why would the LRE's be run under inflated . I've seen weight ratings on rims but never psi
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