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

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
 
Thread Tools Search this Thread Display Modes
 
Old 07-16-2011, 10:43 AM   #1
Member
 
omnicare's Avatar
 
Join Date: Jul 2010
Posts: 42
17.5 inch wheel upgrade

Any experience with upgrading 16" wheels to 17.5" wheels to be able to use a higher load rating tire? Do I need to change, hub, or Brakes, or axle or what?
__________________

__________________
omnicare 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 07-16-2011, 11:06 AM   #2
Moderator Emeritus
 
RustyJC's Avatar


 
Texas Boomers Club
Join Date: Jul 2000
Location: Cypress, Texas USA
Posts: 8,850
I upgraded the wheels and tires on our 5th wheel (see signature) from the original LT235/85R-16G Goodyear G614 RST tires (rated 3750 lbs @ 110 PSIG) to 215/75R-17.5 Michelin XTAs rated 4805 lbs @ 120 PSIG with Alcoa-style aluminum wheels. These tires are actually 0.3" shorter in diameter than the LT235/85R16G Goodyears they replaced, so clearance wasn't an issue at all.



Trailer Tires and Wheels can supply these 17.5" wheels with a choice of 17.5" tires for 1/2, 9/16 and 5/8 studs - the Alcoas require you to change the studs out to the 5/8" size. They shipped the tires and wheels already mounted and balanced with center caps and the appropriate size of lug nuts - excellent service. I'd recommend giving Scott a call.

Rusty
__________________

__________________
2011 Dodge Ram 3500 Laramie Cummins 6.7L/68RFE 6 speed auto/4.10LS crew cab LB dually
2004 Doubletree Mobile Suites 36RE3 5th wheel
Come join us on a TEXAS BOOMERS rally!
RustyJC is offline   Reply With Quote
Old 07-17-2011, 04:25 AM   #3
Member
 
omnicare's Avatar
 
Join Date: Jul 2010
Posts: 42
Thanks RUSTYJC,

No changes needed to the brake drums though? Just the Wheel studs? Does that require drilling the holes bigger to accommodate the bigger studs?
__________________
omnicare is offline   Reply With Quote
Old 07-17-2011, 07:04 AM   #4
Moderator Emeritus
 
RustyJC's Avatar


 
Texas Boomers Club
Join Date: Jul 2000
Location: Cypress, Texas USA
Posts: 8,850
If you use the wheel I showed in my post above, no changes at all are required. You just have to determine what size studs you have (my Dexter 7K axles use 9/16"), and the vendor will provide the appropriate wheels and lug nuts. It's a straight bolt-on - take off your existing wheels and tires and bolt on the new 17.5" wheels and tires. They'll arrive pre-mounted, balanced and ready to bolt on.

If you want to use the genuine Alcoa wheels, on the other hand, and don't have 5/8" studs, you'll have to pull the brake drums and hubs and have the present studs pressed out and the new 5/8" studs pressed in.

Rusty
__________________
2011 Dodge Ram 3500 Laramie Cummins 6.7L/68RFE 6 speed auto/4.10LS crew cab LB dually
2004 Doubletree Mobile Suites 36RE3 5th wheel
Come join us on a TEXAS BOOMERS rally!
RustyJC is offline   Reply With Quote
Old 07-17-2011, 11:50 PM   #5
Member
 
omnicare's Avatar
 
Join Date: Jul 2010
Posts: 42
Thanks, RUSTYJC,

Great info. I am pulling a 20K lb 5th wheel. I think I am going to go with a 235/70r17.5 tire. Most are rated load range h or j and at 6000 lbs each. I have read a few discussions about the Goodyear issues. Any knowledge out there on that?
__________________
omnicare is offline   Reply With Quote
Old 07-18-2011, 04:25 AM   #6
Moderator Emeritus
 
RustyJC's Avatar


 
Texas Boomers Club
Join Date: Jul 2000
Location: Cypress, Texas USA
Posts: 8,850
You can use the Search feature here and search on G614 RST - you'll find LOTS of reading material. I've had 2 failures on 3 year old G614s - that's why I switched to the 17.5" Michelins.

Rusty
__________________
2011 Dodge Ram 3500 Laramie Cummins 6.7L/68RFE 6 speed auto/4.10LS crew cab LB dually
2004 Doubletree Mobile Suites 36RE3 5th wheel
Come join us on a TEXAS BOOMERS rally!
RustyJC is offline   Reply With Quote
Old 07-18-2011, 11:27 AM   #7
Senior Member
 
Cat320's Avatar
 
Fleetwood Owners Club
Join Date: Mar 2011
Posts: 2,836
Quote:
Originally Posted by omnicare View Post
Any experience with upgrading 16" wheels to 17.5" wheels to be able to use a higher load rating tire? Do I need to change, hub, or Brakes, or axle or what?
If you are going to increase the weight on the tires, you'll have to check ALL components related to the tires to insure they are not over loaded...rims, axles, frame, suspension, RV it's self (GVWR), etc.
__________________
2009 Amer Coach Allegiance 40X Riding On A Spartan Chassis
400 HP Cummins ISL
Pulling a Honda CRV
Cat320 is offline   Reply With Quote
Old 07-18-2011, 11:41 AM   #8
Moderator Emeritus
 
RustyJC's Avatar


 
Texas Boomers Club
Join Date: Jul 2000
Location: Cypress, Texas USA
Posts: 8,850
Quote:
Originally Posted by Cat320 View Post
If you are going to increase the weight on the tires, you'll have to check ALL components related to the tires to insure they are not over loaded...rims, axles, frame, suspension, RV it's self (GVWR), etc.
FYI, most of us who have made this swap are NOT carrying additional weight on the tires, nor are we attempting to increase the 5th wheel's axle ratings or GVWR. Rather, we are getting additional operating margin (i.e., safety factor) by going with the higher-rated 17.5" trailer-specific tires because of the troubled, failure-prone history of the 16" Goodyear G614 tires that came on our 5th wheels.

Rusty
__________________
2011 Dodge Ram 3500 Laramie Cummins 6.7L/68RFE 6 speed auto/4.10LS crew cab LB dually
2004 Doubletree Mobile Suites 36RE3 5th wheel
Come join us on a TEXAS BOOMERS rally!
RustyJC is offline   Reply With Quote
Old 07-18-2011, 06:18 PM   #9
Senior Member
 
Cat320's Avatar
 
Fleetwood Owners Club
Join Date: Mar 2011
Posts: 2,836
Quote:
Originally Posted by RustyJC View Post
FYI, most of us who have made this swap are NOT carrying additional weight on the tires, nor are we attempting to increase the 5th wheel's axle ratings or GVWR. Rather, we are getting additional operating margin (i.e., safety factor) by going with the higher-rated 17.5" trailer-specific tires because of the troubled, failure-prone history of the 16" Goodyear G614 tires that came on our 5th wheels.

Rusty
Understand. My comment was made in response to the OP's statement about possibly having to change other components.

When I swapped tires on my Montana 3400 RL, I went from STs to LTs with a lower rating (but still enough for the coach), to get rid of Chinese tires.
__________________
2009 Amer Coach Allegiance 40X Riding On A Spartan Chassis
400 HP Cummins ISL
Pulling a Honda CRV
Cat320 is offline   Reply With Quote
Old 07-19-2011, 06:41 AM   #10
Member
 
omnicare's Avatar
 
Join Date: Jul 2010
Posts: 42
Thanks to all. The trailers manufacturers gross weight is 18,000 so the axles and brake assemblies should be rated for that weight. I am changing wheels and tire to increase my margin of safety as well. I have already had one blow out a a new carlisle (NEVER AGAIN). And three on my old Airstream that could have (and probably should have) killed me on IH-10. I have only recently learned of these 17.5 in wheels and the related tires. The money I have spent on tires and repairs could have been for these upgrades.
__________________
omnicare is offline   Reply With Quote
Old 07-19-2011, 06:50 AM   #11
Moderator Emeritus
 
RustyJC's Avatar


 
Texas Boomers Club
Join Date: Jul 2000
Location: Cypress, Texas USA
Posts: 8,850
Quote:
Originally Posted by omnicare View Post
Thanks to all. The trailers manufacturers gross weight is 18,000 so the axles and brake assemblies should be rated for that weight.
Actually, most aren't. If you're referring to a 5th wheel, approximately 20% of the 5th wheel's loaded weight will be transferred to the tow vehicle as pin weight - this pin weight is NOT carried by the trailer's axles and tires, and the axles and tires are generally not sized to handle it.

In your case, using the 20% number, 3,600 lbs (18,000 x 20%) would be carried by the tow vehicle leaving 14,400 lbs (18,000 - 3,600) to be carried by the 5th wheel's axles and tires. In that case, I'd typically expect to find 2 each 8,000 lb axles under the trailer - 16,000 lb total axle rating. However, if they use 4 each LT235/85R-16G Goodyear G614 RST tires, the axle rating would be dropped to 7500 lbs since each tire is only good for 3750 lbs giving a total axle rating of 15,000 lbs (3,750 x 4).

Rusty
__________________
2011 Dodge Ram 3500 Laramie Cummins 6.7L/68RFE 6 speed auto/4.10LS crew cab LB dually
2004 Doubletree Mobile Suites 36RE3 5th wheel
Come join us on a TEXAS BOOMERS rally!
RustyJC is offline   Reply With Quote
Old 07-20-2011, 06:48 AM   #12
Member
 
omnicare's Avatar
 
Join Date: Jul 2010
Posts: 42
RUSTYJC,

WOW THANKS AGAIN. Your knowledge and experience is obvious. I have three (3) axles. So the margin of safety is there. I have added a MORERYDE pin box and a 8inch extension(with MORYDE's less than ideal blessing) because I have a short bed with a PULLRITE 24K SUPERGLIDE HITCH. There is a leveling issue and I fear the rear axle/tires take extra weight but I will be "trimming the pin box to level the trailer by taking off one bolt pattern from the box.
I am going with the Alcoa forged wheel (6050 lbs weight rating) and Goodyear G-114 235/75R17.5 tires H rated to 60052125 PSI. That oughta do it, huh?
__________________
omnicare is offline   Reply With Quote
Old 07-20-2011, 05:54 PM   #13
Senior Member
 
Kurmudgeon's Avatar
 
Monaco Owners Club
Vintage RV Owners Club
Holiday Rambler Owners Club
Join Date: Mar 2008
Location: La Pine, Oregon
Posts: 234
Quote:
Originally Posted by omnicare View Post
I am going with the Alcoa forged wheel (6050 lbs weight rating) and Goodyear G-114 235/75R17.5 tires H rated to 60052125 PSI. That oughta do it, huh?
Considering all of the stories of tire failure with the Goodyears, you might consider some other tire brands.

JP
__________________
Jim Price
curmudgeon: noun; a crusty, ill-tempered, irascible, cantankerous old person . . . .
79 27' Holiday Rambler Statesman, 78 32' HR Imperial, 85 36' HR Imperial 5th Wheel
Kurmudgeon is offline   Reply With Quote
Old 07-21-2011, 08:23 AM   #14
Member
 
omnicare's Avatar
 
Join Date: Jul 2010
Posts: 42
Kurmudgeon,

Point taken. But from my reading it was G-614's that caused the problems. The G-114's are supposed to be better but I am all ears. If you know of more reliable sources or from personal experience please tell me. I am not 100% sold on the Goodyear and have not purchased yet.

Rob
__________________

__________________
omnicare 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
Windows 7 Upgrade RustyJC Technology: Internet, TV, Satellite, Cell Phones, etc. 22 01-23-2010 02:37 PM
MH Handles Worse After Wheel Alignment dhind Workhorse and Chevrolet Chassis Motorhome Forum 12 08-13-2009 06:21 PM
Steering Wheel Lock rvingrampa Toads and Motorhome Related Towing 5 02-01-2008 01:22 PM
Wheel balancers don't fit on W20? HMS Beagle Workhorse and Chevrolet Chassis Motorhome Forum 1 08-02-2006 09:01 PM
2.5" Stabilizer Bar Upgrade DriVer Workhorse and Chevrolet Chassis Motorhome Forum 17 04-01-2006 02:43 PM

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

RV & Travel Trailer Communities

Our RV & Travel Trailer sites encompasses virtually all types of Recreational Vehicles, from brand-specific to general RV communities.

» More about our RV Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities


Copyright 2002-2012 Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 07:50 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2014, vBulletin Solutions, Inc.