Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > TRAVEL TRAILER, 5th WHEEL & TRUCK CAMPER FORUMS > Trailer Towing and Tow Vehicles Discussion
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 05-10-2015, 09:02 AM   #1
Junior Member
 
Foxhole's Avatar
 
Join Date: Nov 2012
Location: Baton Rouge, Louisiana
Posts: 22
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
FOX
__________________
2007 Duramax 2500, 2001 F-350 V10 4x4
2008 Outback 310BHDS, 22" Shamrock boat
Joshua 24:15 As for me and my house, We will serve the Lord
Foxhole is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 05-10-2015, 09:44 AM   #2
Senior Member
 
Join Date: Dec 2012
Location: Oregon
Posts: 6,621
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.
Cumminsfan is offline   Reply With Quote
Old 05-10-2015, 09:51 AM   #3
Senior Member
 
Join Date: Feb 2009
Location: Ca
Posts: 1,076
If 10K MT, is trailer water-logged?

Here is a chart that may help: http://tire-size-conversion.com
timetogo is offline   Reply With Quote
Old 05-10-2015, 10:01 AM   #4
Senior Member
 
Join Date: Dec 2012
Location: Oregon
Posts: 6,621
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
Cumminsfan is offline   Reply With Quote
Old 05-10-2015, 03:29 PM   #5
Senior Member
 
Join Date: May 2001
Location: Spicewood, Tx
Posts: 708
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.
__________________
Larry Day, Texas Baptist Men volunteer
'13 Silverado LT 3500HD D/A CCSB 2wd, custom RKI bed
'19 Starcraft Telluride 292RLS
dayle1 is offline   Reply With Quote
Old 05-10-2015, 05:13 PM   #6
Senior Member
 
Join Date: Sep 2012
Posts: 4,232
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.
jesilvas is offline   Reply With Quote
Old 05-10-2015, 08:03 PM   #7
Senior Member
 
tuffr2's Avatar
 
Join Date: Sep 2012
Location: Palm Coast Florida
Posts: 12,995
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.
tuffr2 is offline   Reply With Quote
Old 05-10-2015, 10:51 PM   #8
Junior Member
 
Foxhole's Avatar
 
Join Date: Nov 2012
Location: Baton Rouge, Louisiana
Posts: 22
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. ?
Foxhole is offline   Reply With Quote
Old 05-11-2015, 05:53 AM   #9
paz
Senior Member
 
paz's Avatar
 
Join Date: May 2005
Location: Full-timers - Home is where we park it.
Posts: 4,722
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.
paz is offline   Reply With Quote
Old 05-11-2015, 06:55 AM   #10
Senior Member
 
brulaz's Avatar
 
Outdoors RV Owners Club
Join Date: Dec 2014
Location: Ontario Canada
Posts: 1,940
Quote:
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.
__________________
2014 Timber Ridge 240RKS, 70K miles
690W Rooftop + 340W Portable Solar, 215Ah GC2s@24V
2016 Ram 2500 CTD 4x4 RegCab SLT, 10-11 mpgUS tow
brulaz is offline   Reply With Quote
Old 05-11-2015, 09:45 AM   #11
Senior Member
 
Join Date: Dec 2012
Location: Oregon
Posts: 6,621
Quote:
Originally Posted by Foxhole View Post
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
Cumminsfan is offline   Reply With Quote
Old 05-11-2015, 10:43 AM   #12
Junior Member
 
Foxhole's Avatar
 
Join Date: Nov 2012
Location: Baton Rouge, Louisiana
Posts: 22
Not sure what you mean by get rims here.. Do you have a link for somewhere?
Foxhole is offline   Reply With Quote
Old 05-11-2015, 02:15 PM   #13
Senior Member
 
Join Date: Dec 2012
Location: Oregon
Posts: 6,621
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+/-
Cumminsfan is offline   Reply With Quote
Old 05-11-2015, 07:46 PM   #14
Junior Member
 
Foxhole's Avatar
 
Join Date: Nov 2012
Location: Baton Rouge, Louisiana
Posts: 22
Quote:
Originally Posted by Cumminsfan View Post
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!
__________________
2007 Duramax 2500, 2001 F-350 V10 4x4
2008 Outback 310BHDS, 22" Shamrock boat
Joshua 24:15 As for me and my house, We will serve the Lord
Foxhole is offline   Reply With Quote
Reply



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Vexing tire question - apologies for the length slowmachine Class A Motorhome Discussions 20 01-28-2015 08:22 PM
McQuerry Trailer Conversion UncleRich Vintage RV's 3 05-01-2014 07:27 AM
Toad, Tow dolly, Car trailer, or enclosed? cptgregger Toads and Motorhome Related Towing 21 04-15-2014 06:50 PM
Checking tire pressure seadogjim Class A Motorhome Discussions 14 03-19-2014 08:34 PM
Trailer tire question nunzio33 Travel Trailer Discussion 10 03-18-2014 06:47 AM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 04:55 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.