Tire Size and Towing ? - Ford F150 Forum - Community of Ford Truck Fans



Tire Size and Towing ?

Reply
 
 
 
Thread Tools Search this Thread
Old 07-11-2012, 01:41 PM   #1
Senior Member
5 Year Member
Thread Starter
 
ABN Panzer's Avatar
 
Join Date: May 2010
Location: Some random Drop Zone on FT Bragg
Posts: 1,647
Thanked 86 Times in 65 Posts
Default Tire Size and Towing ?

Sorry if this has been asked... sitting in Afghanistan and my search is limited due to network blocks.

My issue & question.

I'm looking to get new tires when I get home.
I currenlty have 275/55/20 and am looking to go to a 275/60/20.
This really only takes it from a 31.9 to a 33 inch tire.

I'm sure I've heard that increasing tire size will affect tow capability... but at the time I thought it only really mattered on larger changes. Example a 31.9 to 35s etc.

I've got 3.55 gearing on a 2010 FX2, 5.4L with the 9800 GVR package.

Will I see any real significant drop in tow capability with a simple 1 inch increase in tire size?
ABN Panzer is offline   Reply With Quote
The Following User Says Thank You to ABN Panzer For This Useful Post:
Dobber64 (01-26-2013)
Old 07-11-2012, 03:29 PM   #2
Senior Member
 
tomb1269's Avatar
 
Join Date: Dec 2011
Location: Albany NY area
Posts: 406
Thanks: 0
Thanked 44 Times in 42 Posts
Default

I know that the 2005 owners manual states to subtract 400 lbs from max tow for 18" rims.
tomb1269 is offline   Reply With Quote
Old 07-11-2012, 09:03 PM   #3
Canuck with a truck
5 Year Member
 
f150skidoo's Avatar
 
Join Date: May 2011
Location: Ontario, Canada
Posts: 2,471
Thanked 45 Times in 41 Posts
Default

I'm no expert but when i put on oversize tires i went up 2" in tire size but went from a p rated tire to a LT E rated. So i may of lost 800 pounds towing but i feel that it was a wash because the tire can handle the weight a lot better than the stock truck.
f150skidoo is offline   Reply With Quote
Old 07-13-2012, 06:17 AM   #4
Senior Member
5 Year Member
Thread Starter
 
ABN Panzer's Avatar
 
Join Date: May 2010
Location: Some random Drop Zone on FT Bragg
Posts: 1,647
Thanked 86 Times in 65 Posts
Default

Hmmm,

Not looking to change the rim size... just the tire itself and only by 1 inch.
However it still may apply. Wouldnt think it would be that much of a difference for an extra inch of rubber.
ABN Panzer is offline   Reply With Quote
Old 07-13-2012, 03:03 PM   #5
Senior Member
 
tomb1269's Avatar
 
Join Date: Dec 2011
Location: Albany NY area
Posts: 406
Thanks: 0
Thanked 44 Times in 42 Posts
Default

The tire specs will determine any change in capacity due to the tires. Ford drops the weight due to the rims size only. I would assume it may have something to do with rim weight and height.
tomb1269 is offline   Reply With Quote
Old 07-16-2012, 11:35 AM   #6
Grumpy Old Man
5 Year Member
 
smokeywren's Avatar
 
Join Date: Nov 2011
Location: Midland County Texas, just west of the star in my avatar
Posts: 1,905
Thanked 458 Times in 362 Posts
Default

Okay, here's the math.

The percentage change is tire revs/mile will be the same as the percentage change in the effective axle ratio. (Longer legs means less towing power/torque).

BFGoodrich LongTrail tires:
275/55R20 = 652 revs/mile
275/60R20 = 630 revs/mile

652 minus 630 = 22
22 divided by 652 = 3.4%

3.55 axle ratio minus 3.4% = 3.42

So your 3.55 axle will "feel like" a 3.42.

I suspect you wouldn't be able to feel the difference.

Only if you were loaded right up against the GCWR of your pickup, with a trailer that weighs around 9,000 pounds, should it make a feelable difference.

Quote:
I've got 3.55 gearing on a 2010 FX2, 5.4L with the 9800 GVR package.
No, you don't have a 9,800 GVWR pkg. The most Ford offered was 8,200 GVWR available only with the the HD payload Pkg and 3.73 axle ratio. You probably meant 9,800 tow rating which your truck has if it has the 145" wheelbase.
smokeywren is online now   Reply With Quote
The Following User Says Thank You to smokeywren For This Useful Post:
ABN Panzer (07-18-2012)
Old 07-16-2012, 01:51 PM   #7
Senior Member
 
IronJoce's Avatar
 
Join Date: Sep 2011
Location: Montreal, QC
Posts: 864
Thanked 27 Times in 26 Posts
Default

I'm running the same size and I tow a 5th wheel... can't really tell the difference.

The only thing, you won't find LT rated tires in that size. I went with P rated but Extra Load version (3000lbs each).

Good luck
IronJoce is offline   Reply With Quote
Old 07-18-2012, 12:31 AM   #8
Senior Member
5 Year Member
Thread Starter
 
ABN Panzer's Avatar
 
Join Date: May 2010
Location: Some random Drop Zone on FT Bragg
Posts: 1,647
Thanked 86 Times in 65 Posts
Default

Quote:
Originally Posted by smokeywren View Post
No, you don't have a 9,800 GVWR pkg. The most Ford offered was 8,200 GVWR available only with the the HD payload Pkg and 3.73 axle ratio. You probably meant 9,800 tow rating which your truck has if it has the 145" wheelbase.
Yep.. Mistyped - thanks for the catch... as well as for the other information... Very helpful!

Quote:
Originally Posted by IronJoce View Post
I'm running the same size and I tow a 5th wheel... can't really tell the difference.

The only thing, you won't find LT rated tires in that size. I went with P rated but Extra Load version (3000lbs each).
Good luck
Thanks!
My OEM tires are already P rated tires... the new ones (bigger) would be as well but have a heavier load rating.


All thanks for the replies!
ABN Panzer is offline   Reply With Quote
Old 07-18-2012, 10:09 AM   #9
ColdWar Vet-USN Shellback
 
Join Date: Aug 2011
Location: STL area
Posts: 435
Thanked 60 Times in 51 Posts
Default

Quote:
Originally Posted by IronJoce View Post
I'm running the same size and I tow a 5th wheel... can't really tell the difference.

The only thing, you won't find LT rated tires in that size. I went with P rated but Extra Load version (3000lbs each).

Good luck

So, what tires did you get and how do you like them?
RedOne is offline   Reply With Quote
Old 07-18-2012, 10:22 AM   #10
Senior Member
 
IronJoce's Avatar
 
Join Date: Sep 2011
Location: Montreal, QC
Posts: 864
Thanked 27 Times in 26 Posts
Default

Quote:
Originally Posted by RedOne

So, what tires did you get and how do you like them?
Cooper Zeon LTZ

They are quiet, drive well even when truck is loaded and they look very good IMO. I run them at 43-44PSI
IronJoce is offline   Reply With Quote
The Following User Says Thank You to IronJoce For This Useful Post:
RedOne (07-18-2012)
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
33'S? styles976 Aftermarket Products, Reviews & Installation 28 11-24-2016 06:50 PM
Looking for TRUCK LEVELING ADVICE! petercar93 2015 - Present Ford F150 29 06-30-2016 12:50 PM
Ugg! BF KO2's and 18's. Markeje 2004 - 2008 Ford F150 14 09-14-2015 08:28 AM
Engine Rebuild Question smokeater52 Maintenance Shop 0 09-01-2015 11:41 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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



All times are GMT -4. The time now is 05:17 PM.


Copyright 2006 - 2016 F150Forum.com