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 09-28-2015, 03:44 PM   #15
Senior Member
 
TDI-Minnie's Avatar
 
Join Date: Sep 2013
Posts: 1,733
What difference does the wheel size make??
A 20" wheel with a low aspect ratio tire should have the same overall tire diameter as a 17" wheel with a high aspect ratio tire. Or at least very close.

Now, if you intend to get some oversized tires (regardless of wheel size), you will want the taller final gear (3.55+).

If you are towing a small trailer for the truck, a 3.31 will be fine and give you better mpg. Just don't exceed the tow rating for that gearset.
__________________

__________________
2013 Winnebago 2301BH-Red
2012 Ram 2500 Megacab HO CTD
TDI-Minnie 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 09-28-2015, 03:54 PM   #16
Senior Member
 
Join Date: Jun 2012
Location: Jacksonville, Florida
Posts: 583
The 20 inch wheel may have a higher rating than the 17.
__________________

__________________
Bob and sometimes - Nina - a Staffordshire Terrier/a SPOILED pit and her kitty Spaz
2006 Dodge SLT 2500 4x4 Cummins Quad Cab w/AT and 3.73
2007 Salem Sport LE 26FBSRV (TH) w/ my Victory Motorcycle in it or a EZ GO Shuttle cart.
NFlcamper is offline   Reply With Quote
Old 09-28-2015, 04:23 PM   #17
Registered User
 
Forest River Owners Club
Join Date: Mar 2010
Location: Western, MA
Posts: 619
Quote:
Originally Posted by NFlcamper View Post
The 20 inch wheel may have a higher rating than the 17.

Actually, in the case of Ford's, the 20" wheels have a lower capacity that the smaller sizes. This is why you can't get 20's with the camper package. The 20" tires actually have a higher rating (shorter sidewalls) than their smaller counterparts but the wheels are the weak link in the combo. I ordered the camper package to get the sway bar, sold my 18" combo on craigslist, and bought a set of Ford 20" Platinum wheels on eBay. Best of both worlds for me.
__________________
taken is offline   Reply With Quote
Old 09-28-2015, 04:26 PM   #18
Registered User
 
Forest River Owners Club
Join Date: Mar 2010
Location: Western, MA
Posts: 619
Quote:
Originally Posted by TDI-Minnie View Post
What difference does the wheel size make??
A 20" wheel with a low aspect ratio tire should have the same overall tire diameter as a 17" wheel with a high aspect ratio tire. Or at least very close.
Each size you go up or down costs you aprox an inch. That's why you can go to up or down one factory size without tripping your check engine light on your truck. Go from 17's to 20's and you get a light.
__________________
taken is offline   Reply With Quote
Old 09-28-2015, 06:24 PM   #19
Senior Member
 
Join Date: Feb 2009
Location: Ca
Posts: 1,050
Quote:
Originally Posted by AJP207 View Post
Question from the uninformed. Buying an F350 diesel, torque remains the same regardless of which rear end I purchase. I have plenty of payload capacity, haul capacity as I am not hauling a large fifth wheel. I would like some pros and cons to help me determine which rear end to get, 3.31 or 3.55. Is there much difference in the gas mileage and acceleration? Thanks in advance,

If you tow 70+ the higher ratio may help gas mileage. Would take a real world test to determine.
__________________
timetogo is offline   Reply With Quote
Old 09-28-2015, 06:37 PM   #20
Senior Member
 
tuffr2's Avatar
 
Join Date: Sep 2012
Location: Palm Coast Florida
Posts: 2,457
I would say between those two gear ratio's there will not be much difference. They are so close. You are not comparing 4:10 vs 3:52.

If I was using the truck as a daily driver and not towing a heavy trailer I would get the 3:31 gear set. My educated guess is the 3:31 gears will run maybe 500 RPM's less.
__________________
tuffr2 is offline   Reply With Quote
Old 09-28-2015, 06:45 PM   #21
RVM #74
 
PushedAround's Avatar


 
Tiffin Owners Club
Join Date: Sep 2012
Location: Ambler, PA
Posts: 2,853
Blog Entries: 7
Quote:
Originally Posted by taken View Post
Each size you go up or down costs you aprox an inch. That's why you can go to up or down one factory size without tripping your check engine light on your truck. Go from 17's to 20's and you get a light.
I can't see how that would happen.
__________________
Larry & Cheryl Oscar, Louie, Ranger & Henry (our Springers)
PushedAround is offline   Reply With Quote
Old 09-28-2015, 07:21 PM   #22
Registered User
 
Forest River Owners Club
Join Date: Mar 2010
Location: Western, MA
Posts: 619
Quote:
Originally Posted by PushedAround View Post
I can't see how that would happen.

You can't see how what would happen?
__________________
taken is offline   Reply With Quote
Old 09-28-2015, 07:45 PM   #23
RVM #74
 
PushedAround's Avatar


 
Tiffin Owners Club
Join Date: Sep 2012
Location: Ambler, PA
Posts: 2,853
Blog Entries: 7
Quote:
Originally Posted by taken View Post
You can't see how what would happen?
How changing tire diameters would throw a check engine light. Unless the truck can independently measure its ground speed, how would it know?
__________________
Larry & Cheryl Oscar, Louie, Ranger & Henry (our Springers)
PushedAround is offline   Reply With Quote
Old 09-28-2015, 07:49 PM   #24
Registered User
 
Forest River Owners Club
Join Date: Mar 2010
Location: Western, MA
Posts: 619
Quote:
Originally Posted by PushedAround View Post
How changing tire diameters would throw a check engine light. Unless the truck can independently measure its ground speed, how would it know?

It's not ground speed. I can't remember which combination of sensors and the speedo that get thrown off when this happens but it's a well documented event on the Ford forums. It's usually guys with 3.31's and 17's that go straight to 20's. It's a code that the dealer can't clear (permanently) as you can never order 3.31's with 20's.
__________________
taken is offline   Reply With Quote
Old 09-28-2015, 08:31 PM   #25
Senior Member
 
wingnut60's Avatar
 
Join Date: Aug 2004
Location: Wherever the Suites is
Posts: 2,982
AJP--
Never seen a Ford DRW with 20" wheels from the factory...
Joe
__________________
'15 38RSSA Mobile Suites
'05 36TK3 Mobile Suites--retired but not forgotten
'17 F450--trying one more Ford
'09 F450--died, replaced with '10--retired
wingnut60 is offline   Reply With Quote
Old 09-28-2015, 08:33 PM   #26
Registered User
 
Forest River Owners Club
Join Date: Mar 2010
Location: Western, MA
Posts: 619
Quote:
Originally Posted by wingnut60 View Post
AJP--
Never seen a Ford DRW with 20" wheels from the factory...
Joe
Yep, no such animal.
__________________
taken is offline   Reply With Quote
Old 09-29-2015, 06:37 AM   #27
Senior Member
 
TDI-Minnie's Avatar
 
Join Date: Sep 2013
Posts: 1,733
Quote:
Originally Posted by PushedAround View Post
I can't see how that would happen.
Agree
If all wheels/tires are the same size, there is no way the truck could sense anything.
If they are staggered it would certainly trip the esp. And don't try to use 4wd.

Larger wheels and tire will usually reduce towing and load carrying. Gearing and brakes are negatively effected if you plus size the OVERALL diameter.
__________________
2013 Winnebago 2301BH-Red
2012 Ram 2500 Megacab HO CTD
TDI-Minnie is offline   Reply With Quote
Old 09-29-2015, 08:17 AM   #28
Senior Member
 
Scottybdivin's Avatar


 
Newmar Owners Club
Join Date: Jun 2012
Location: Spicewood Texas (West of Austin)
Posts: 3,349
The tires on the 20" wheels have a higher weight rating than 18". They go up to 3750 lbs.
__________________

__________________
Scotty and Kristen, Airedales Dagny and Wyatt
2007 Newmar Mountain Aire 4528, 450 HP ISM, Allison 4000, 8 Trojan T-105's
2014 F150 4x4 Crew Cab Platinum 157" WB
Roadmaster Blackhawk 2, RVI2 Brake System
Scottybdivin is online now   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
Monaco Roof end cap seal decaying. FixerCQI Monaco Owner's Forum 14 08-03-2015 12:34 PM
Dana Rear End Quinten Workhorse and Chevrolet Chassis Motorhome Forum 1 07-21-2015 12:06 PM
Need Suggestions for Wall/Wallpaper Repair on Damaged Rear Wall bobinyelm 5th Wheel Discussion 9 10-26-2014 07:19 PM
Meritor Rear End # Rating EZDZIT Freightliner Motorhome Chassis Forum 4 10-20-2014 05:49 PM
Best way to repair damage rear trailer wall? bobinyelm Travel Trailer Discussion 3 10-10-2014 12:30 AM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 09:50 AM.


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