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 03-31-2013, 05:52 AM   #1
Member
 
Join Date: Feb 2013
Posts: 45
Advantages getting tires that exceed GAWR (rear)?

A splinter thread from a previous discussion:

The GAWR (rear) on my 2011 Ram 3500 Laramie Longhorn Short Bed Crew Cab SRW is 6500# (from Ram Towing Chart). I am planning on getting OEM tires - Michelin LXT MS/2 265-70-17 E rated at 3195# each. Combined, the tires can be loaded up to 6400# (100# less that GAWR (rear)). I do not ever plan on exceeding the GAWR of 6500# - my current GAW (rear) will be approx. 5900# with our hitch + pin weight (600# under GAWR (rear) and 500# under the combined tires load rating)

My question is whether folks think I need tires with a higher load rating (say 3500# each) and, if so, what are the advantages or if what I am planning will suffice? Thanks
__________________

__________________
Living in NW Montana and we don't even ski!! Oregon, here we come!
2011 Ram Laramie Longhorn Crew Cab 6.7L Turbodiesel
2013 Thor/Crossroads/Redwood 36FL (on order )
Oregonbound 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 03-31-2013, 06:04 AM   #2
Senior Member
 
94-Newmar's Avatar
 
Join Date: Nov 2009
Posts: 2,043
The weight ratings, obviously, are based upon the entire chassis' ability to handle X weight. Everything is included.... frame, tires, wheels, springs, shocks, etc etc. Unless you're changing everything included above over to something that will carry more weight then there is no "advantage" to increasing the tires carrying capacity. Therefore increasing the load carrying capacity of the tires won't help or hinder you... if you can get a good price on a higher rated tire go for it! :-)
__________________

__________________
94-Newmar Kountry Star 40-KSDP
Spartan/Cummins 8.3C-300HP/Allison 3060 WTEC-II/25yr RV Tech RVIA Certified/Onan-Cummins Certified
94-Newmar is offline   Reply With Quote
Old 03-31-2013, 01:20 PM   #3
Senior Member
 
Join Date: Dec 2012
Posts: 323
Overkill is cheaper
sometimes.
in the long run.
:-)
__________________
2005 volvo 670 12 speed auto shift
singled, hensley trailer saver smart car "on deck"
Newmar 34 rsks Torrey Pine
hone eagle is offline   Reply With Quote
Old 03-31-2013, 07:55 PM   #4
Senior Member
 
Join Date: Mar 2012
Location: Tucson, AZ
Posts: 150
Might as well put on some 275 or 285's and have a load capability of over 7000#. It's the tire load rating that determines the axle rating anyway. You'll find that 2500 and 3500 use the same axle brakes and shocks. What makes a 3500 is the extra leaf spring and the more capable tires - everything else is the same.
__________________
2009 Chevy 2500HD Duramax
2008 Everest 305T
azdryheat is offline   Reply With Quote
Old 03-31-2013, 07:58 PM   #5
Senior Member
 
Mr_D's Avatar
 
Solo Rvers Club
iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 28,382
Quote:
Originally Posted by azdryheat View Post
It's the tire load rating that determines the axle rating anyway.
Not true. It's the LESSER of anything on the vehicle, be it the tires, wheels, axles, shocks, springs, brakes, transmission, engine etc on most vehicles.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft
Charter Good Sam Lifetime Member, FMCA, SKP
RV'ing since 1957, NRA Benefactor Life, towing '14 CR-V
Mr_D is offline   Reply With Quote
Old 03-31-2013, 08:02 PM   #6
Moderator Emeritus
 
RustyJC's Avatar


 
Texas Boomers Club
Join Date: Jul 2000
Location: Cypress, Texas USA
Posts: 8,854
Quote:
Originally Posted by azdryheat View Post
Might as well put on some 275 or 285's and have a load capability of over 7000#.
I love this rationale. Carried to its (il)logical end, one could put 19.5" tires and wheels on a 4 cylinder automatic Ford Ranger and tow a 45' Teton 5th wheel.

Rusty
__________________
2016 Ram Longhorn 3500 Dually 4x4 CCLB, 385/900 Cummins, Aisin AS69RC, 4.10
2014.5 DRV Mobile Suites 38RSSA #6972
Come join us on a TEXAS BOOMERS rally!
RustyJC is offline   Reply With Quote
Old 03-31-2013, 08:04 PM   #7
Senior Member
 
palehorse89's Avatar


 
Newmar Owners Club
Join Date: Oct 2009
Posts: 7,721
Quote:
Originally Posted by Oregonbound View Post
A splinter thread from a previous discussion:

The GAWR (rear) on my 2011 Ram 3500 Laramie Longhorn Short Bed Crew Cab SRW is 6500# (from Ram Towing Chart). I am planning on getting OEM tires - Michelin LXT MS/2 265-70-17 E rated at 3195# each. Combined, the tires can be loaded up to 6400# (100# less that GAWR (rear)). I do not ever plan on exceeding the GAWR of 6500# - my current GAW (rear) will be approx. 5900# with our hitch + pin weight (600# under GAWR (rear) and 500# under the combined tires load rating)

My question is whether folks think I need tires with a higher load rating (say 3500# each) and, if so, what are the advantages or if what I am planning will suffice? Thanks
Don't over do it to much as the higher the ply of the tire the worse the ride will get......I would go for the tire that will do the job by the rating and nothing more.
__________________
2000 Newmar MADP 4060, 350ISC, Spartan MM, IFS 2011 Jeep JK, M&G Braking, 2014 MTI 27' Hog Hauler, Wireless brake control, 2006Ultra & 1989 Springer
palehorse89 is offline   Reply With Quote
Old 04-01-2013, 10:15 AM   #8
Moderator Emeritus
 
SmokeyWren's Avatar


 
Join Date: Jun 2011
Location: Midland County, Texas
Posts: 3,326
Quote:
Originally Posted by Oregonbound View Post
The GAWR (rear) on my 2011 Ram 3500 Laramie Longhorn Short Bed Crew Cab SRW is 6500# (from Ram Towing Chart).
Something doesn't add up. The rear GAWR should not be more than the combined weight capacity of the two rear tires. Your stock tires have a weight capacity of 3,195 pounds each, or 6,390 combined. Therefore your rear GAWR should not be more than 6,390.

Double-check your rear GAWR. It's located on a sticker on the driver's doorpost or door frame, along with other info such as VIN, tire size and PSI, GVWR and front and rear GAWRs.

There's something weird about tire size LT265/70R17E. Other 17" tire sizes that are bigger also have the same 3,195 weight capacity, whether 275, 285 or even bigger - per the tire specs on TireRack.com. So if you stick with stock wheels, nobody makes a load range E tire with more weight capacity than 3,195. To go up in tire weight capacity requires you to change to 18" wheels. then the world opens up with all sorts of tire sizes with more weight capacity.

For example, if you go to tire size LT275/65R18E, weight capacity is 3,415, and the diameter of the tire is very close to the stock 17s, so the accuracy of your speedo/odo/trip meter is not messed up. And go on up to LT285/65R18E and the weight capacity goes up to 3,640, but the diameter of the tire is a bit more, so your speedo/etc. would be about 2% slower. IOW, an indicated 70 MPH would be an actual 71.6 MPH on Officer Bob's radar gun.
__________________
Grumpy ole man with over 50 years towing experience. Now my heaviest trailer is a 7,000-pound enclosed cargo trailer, RV is a 5,600 pound Skyline Nomad Joey 196S, and my tow vehicle is a 2012 F-150 3.5L EcoBoost SuperCrew.
SmokeyWren is offline   Reply With Quote
Old 04-01-2013, 12:49 PM   #9
Junior Member
 
Join Date: Mar 2013
Posts: 7
Nitto terra grappler Lt285/70R17 E126R is rated at 3750 pounds.

http://www.nittotire.com/Tire/terragrappler#size
__________________
06cummins197 is offline   Reply With Quote
Old 04-01-2013, 08:16 PM   #10
Senior Member
 
FastEagle's Avatar
 
Join Date: Sep 2009
Posts: 818
Quote:
Originally Posted by Oregonbound View Post
A splinter thread from a previous discussion:

The GAWR (rear) on my 2011 Ram 3500 Laramie Longhorn Short Bed Crew Cab SRW is 6500# (from Ram Towing Chart). I am planning on getting OEM tires - Michelin LXT MS/2 265-70-17 E rated at 3195# each. Combined, the tires can be loaded up to 6400# (100# less that GAWR (rear)). I do not ever plan on exceeding the GAWR of 6500# - my current GAW (rear) will be approx. 5900# with our hitch + pin weight (600# under GAWR (rear) and 500# under the combined tires load rating)

My question is whether folks think I need tires with a higher load rating (say 3500# each) and, if so, what are the advantages or if what I am planning will suffice? Thanks
You’re getting the GAWR information from the wrong place. The information the vehicle manufacturer placed on the vehicle’s certification label (tire placard) is the figure the they used for tire/rim fitment.

Here is a typical reference for truck tire replacements.

http://www.google.com/url?sa=t&rct=j...4S0Di_rmaPw-mw

This reference contains the best description for plus sizing your tires and using industry standards.

http://www.tiresafety.com/images/Tir...t%20Manual.pdf

Complete rim/wheel dimensions are not always depicted on the actual rim/wheel. It is not a DOT requirement to do so. Surprisingly, the rim/wheel load capacities and psi (air pressure) figures are set by the SAE. The best place to seek answers for those figures is from the actual rim/wheel manufacturer.


FastEagle
FastEagle is offline   Reply With Quote
Old 04-01-2013, 09:54 PM   #11
Senior Member
 
Join Date: Apr 2004
Posts: 1,077
Dodge shows the 3500 SRW up to a '12 model has a 6200 RAWR. In '13 it goes on up to 7000 lbs RAWR.

looking at Dodge specs shows the rear spring pack at 6500 lbs but with a 6200 RAWR. I think Dodge has a typo on some of their website spec charts.
__________________
'03 Dodge 2500 Cummins HO 3.73 NV5600 Jacobs
'98 3500 DRW 454 4x4 4.10 crew cab
'97 Park Avanue RK 28' 2 slides
JIMNLIN is offline   Reply With Quote
Old 04-02-2013, 06:26 AM   #12
Member
 
Join Date: Feb 2013
Posts: 45
Quote:
Originally Posted by JIMNLIN View Post
Dodge shows the 3500 SRW up to a '12 model has a 6200 RAWR. In '13 it goes on up to 7000 lbs RAWR.

looking at Dodge specs shows the rear spring pack at 6500 lbs but with a 6200 RAWR. I think Dodge has a typo on some of their website spec charts.
I'm not sure what you are using for a reference but at - http://www.rambodybuilder.com/2011/d...ammlup3500.pdf - it shows for a 2011 Ram Crew Cab 4x4 Longhorn SRW, the RAWR ("GAWR (rear)"on pdf) is 6500#.
__________________
Living in NW Montana and we don't even ski!! Oregon, here we come!
2011 Ram Laramie Longhorn Crew Cab 6.7L Turbodiesel
2013 Thor/Crossroads/Redwood 36FL (on order )
Oregonbound is offline   Reply With Quote
Old 04-02-2013, 09:48 PM   #13
Senior Member
 
Join Date: Apr 2004
Posts: 1,077
Thats what I'm referring to. The '08/'09/'12 specs shows a 6200 RAWR then the '10/'11 spec shows a 6500 RAWR. Most 3500 SRW owners report a 6200 RAWR door tag. I'm guessing the '10 and '11 specs could be a typo as the OEM tires at 3195 lb don't = 6500 RAWR per the FMVSS's.
__________________
'03 Dodge 2500 Cummins HO 3.73 NV5600 Jacobs
'98 3500 DRW 454 4x4 4.10 crew cab
'97 Park Avanue RK 28' 2 slides
JIMNLIN is offline   Reply With Quote
Old 04-03-2013, 10:59 AM   #14
Member
 
Join Date: Feb 2013
Posts: 45
Quote:
Originally Posted by JIMNLIN View Post
Thats what I'm referring to. The '08/'09/'12 specs shows a 6200 RAWR then the '10/'11 spec shows a 6500 RAWR. Most 3500 SRW owners report a 6200 RAWR door tag. I'm guessing the '10 and '11 specs could be a typo as the OEM tires at 3195 lb don't = 6500 RAWR per the FMVSS's.
Not sure what "FMVSS" means(?). I'm going to call Dodge directly and am getting it in for service on Thursday so will ask then as well. Thanks.
__________________

__________________
Living in NW Montana and we don't even ski!! Oregon, here we come!
2011 Ram Laramie Longhorn Crew Cab 6.7L Turbodiesel
2013 Thor/Crossroads/Redwood 36FL (on order )
Oregonbound is offline   Reply With Quote
Reply

Tags
tires



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


» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 07:57 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.