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Old 05-10-2015, 10:02 AM   #1
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Trailer tire clearance? HELP

Trailer tire clearance? I have a 2008 Outback 310BHS TT. It is time to buy tires and I Just got back from the scale. The trailer (Empty and dry!) weighs right at 10,000 including the 1200 tongue weight. My original tires ST225/75/15 have a 2040lb max weight rating at 65psi. I'm already overloaded from the factory!!! I have 15" 6 lug wheels now. I want to go to 16" 6 lug wheels and heavier tires either a LT or a 14ply ST tire. How much tire fender well clearance is recommended for hwy use? Clearly the more the better but what can I safely get by with? I really don't want to go with spacer blocks or flipping the axle.
Thanks
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Old 05-10-2015, 10:44 AM   #2
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225/75/15 tires have a 2540 max load rating at@65psi.
2540 x 4 equals 10,160lbs.


According to Keystone your TT weighs 7941lbs dry and the tongue weight is 865lbs.
Cargo weight capacity is 2041lbs.
7941 + 2041 = 9982lbs.


I think your getting your info mixed up.


If you load you TT to the max then you are around 10,000lbs.
Minus the tongue weight of (12%) 1200lbs and you have 8800lbs on the rear axles.
10,160 for max tire load @65 psi - 8800lbs and you have 1360lbs left for tire weight reserve. That's 340lbs per tire.


Now as to whether or not 16" tires will work that's determined by the clearance on top of the tire as well as between the tow tires. 225/75/15 tires are 28.3" dia. You need to pick which 16" tire you want and see what it's dia is and them measure what you have for clearance on your TT.
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Old 05-10-2015, 10:51 AM   #3
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If 10K MT, is trailer water-logged?

Here is a chart that may help: http://tire-size-conversion.com
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Old 05-10-2015, 11:01 AM   #4
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After dbl checking you if you have 225/75/15 D tires they're 2540lbs each.
225/75/15 C tires are 2150lbs each. 2150 x 4 =8600lbs.
You would be over weight with C tires.
Heres a tire chart. These are industry standard weights and stay the same across brands.
Goodyear
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Old 05-10-2015, 04:29 PM   #5
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If it is true that the tires have insufficient load capacity, then you need to also check the axle ratings. It is rare for manufacturers to cut corners on the tires and not do the same thing on the axles. My point is that getting higher rated tires may not provide any real improvement in margin, you may need to upgrade the entire running gear.
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Old 05-10-2015, 06:13 PM   #6
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You say that's the trailer weight, but what were the individual scale weights? Because if the entire trailer is 10K, then the trailer axles are lighter than that because the tongue carries some weight too.
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Old 05-10-2015, 09:03 PM   #7
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You do not need a lot of fender clearance. I had to trim some of the plastic fender to put larger tires on my trailer. I only trimmed the very inside corner plastic. You can't even tell it was trimmed.
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Old 05-10-2015, 11:51 PM   #8
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I will recheck the weigh tickets and report back. Thanks for the comments that is what I am looking for.. My tire guy did comment that he didn't see 15" with 6 lug 5.5 on trailers very often. The 6 lug 16" is much more common.. I pulled off the tire I have the least clearance and stuck the LT235/85/16 from my ford on the hub. I centered it as best as I could. The bolts were all wrong but I did get a pretty good idea of hight. as neer as I can tell about 2.5" with the 235/16. This is very rough but is a starting point.. It seems like I remember the spring manufacturers use 2" as max travel. ?
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Old 05-11-2015, 06:53 AM   #9
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Quote:
Originally Posted by Foxhole View Post
...I pulled off the tire I have the least clearance and stuck the LT235/85/16 from my ford on the hub. I centered it as best as I could. The bolts were all wrong but I did get a pretty good idea of hight. as neer as I can tell about 2.5" with the 235/16. This is very rough but is a starting point.. It seems like I remember the spring manufacturers use 2" as max travel. ?
Tire manufacturers have spec sheets available online that will give you tire dimensions including diameters. You can look up the diameter of your current tire and the diameters of any other size(s) you are considering and compare them. With your current tires mounted on the trailer, you can estimate where the OD of the new tires will fall in relation to any potential obstructions.
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Old 05-11-2015, 07:55 AM   #10
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Originally Posted by Foxhole View Post
...
The bolts were all wrong but I did get a pretty good idea of hight. as neer as I can tell about 2.5" with the 235/16. This is very rough but is a starting point.. It seems like I remember the spring manufacturers use 2" as max travel. ?
Think I read Dexter Axles recommends 3"?
But that may be for their Torflex (?) axles.
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Old 05-11-2015, 10:45 AM   #11
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I will recheck the weigh tickets and report back. Thanks for the comments that is what I am looking for.. My tire guy did comment that he didn't see 15" with 6 lug 5.5 on trailers very often. The 6 lug 16" is much more common.. I pulled off the tire I have the least clearance and stuck the LT235/85/16 from my ford on the hub. I centered it as best as I could. The bolts were all wrong but I did get a pretty good idea of hight. as neer as I can tell about 2.5" with the 235/16. This is very rough but is a starting point.. It seems like I remember the spring manufacturers use 2" as max travel. ?
There are a lot of trailers using 6-5.5 15" wheels. All 4400# and 5200# axles use that size.
You can get rims here that are what the current trailers are using. It's not the only place but they do sell to a lot of manufactures.


Wheels
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Old 05-11-2015, 11:43 AM   #12
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Not sure what you mean by get rims here.. Do you have a link for somewhere?
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Old 05-11-2015, 03:15 PM   #13
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Bottom of my ^post. Wheels. Click on it. It's an RV specific wheel/tire supplier that provides regional service to different RV manufactures. Also to the public. Rims run around $100.00+/-
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Old 05-11-2015, 08:46 PM   #14
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Bottom of my ^post. Wheels. Click on it. It's an RV specific wheel/tire supplier that provides regional service to different RV manufactures. Also to the public. Rims run around $100.00+/-
I see what I missed. Thanks!
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