Dually Tire size question
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Cargo Master
Joined: Nov 2005
Posts: 2,051
Likes: 10
From: TEXAS
Dually Tire size question
I am looking a tire purchase soon. I want to go a bit wider and a little taller....notice I said "Bit and Little" as to the descriptions of the increased size. I want to make sure that there is no issues with the sidewalls rubbing on the DRW tires when under a full load.
I would like to go with a little more aggressive tire pattern, not that I want to go off road mudding or rock crawling, but would like to add a little more grip to the tires than what the factory supplied pattern offers.
What suggestions do you have to offer as far as size goes. I have no plans to do a level kit, lift kit nor anything that would adjust the factory clearance for tires.
Thanks in advance,
I would like to go with a little more aggressive tire pattern, not that I want to go off road mudding or rock crawling, but would like to add a little more grip to the tires than what the factory supplied pattern offers.
What suggestions do you have to offer as far as size goes. I have no plans to do a level kit, lift kit nor anything that would adjust the factory clearance for tires.
Thanks in advance,
Hotshot
Joined: Nov 2000
Posts: 11,591
Likes: 14
From: Pflugerville, tx
was a post on mileage betweem 3.73 ad 4.30 which listed + sizes
https://www.ford-trucks.com/forums/1...l#post15590220
some of these + sizes seem only available with offroad treads (I don't want that)
https://www.ford-trucks.com/forums/1...l#post15590220
some of these + sizes seem only available with offroad treads (I don't want that)
Thread Starter
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Cargo Master
Joined: Nov 2005
Posts: 2,051
Likes: 10
From: TEXAS
I appreciate the link and did look it over carefully. It does a good job as to tire size adjusting the gear ratio.
But, what I am trying to figure out is what would be the largest tire size that I could mount on a DRW and maintain an appropriate clearance between the rear dual tires when under load.
I am not against picking up an inch or two in height if there is sufficient clearance for the larger diameter with out adding a lift kit. I really don't want to go away from the stock suspension set up. Of course if the tire diameter difference were 2" it would only add 1 inch in height.
One thing I did notice on the chart in the link is that it showed the diameter of the stock 245/75-17 tires as being 30.5". The two tire calculators that I used showed the 245/75-17 tire to be 31.45 inch in diameter.
Not looking like there are many options without going full tilt mud/snow.
But, what I am trying to figure out is what would be the largest tire size that I could mount on a DRW and maintain an appropriate clearance between the rear dual tires when under load.
I am not against picking up an inch or two in height if there is sufficient clearance for the larger diameter with out adding a lift kit. I really don't want to go away from the stock suspension set up. Of course if the tire diameter difference were 2" it would only add 1 inch in height.
One thing I did notice on the chart in the link is that it showed the diameter of the stock 245/75-17 tires as being 30.5". The two tire calculators that I used showed the 245/75-17 tire to be 31.45 inch in diameter.
Not looking like there are many options without going full tilt mud/snow.
Post Fiend
Joined: Jun 2014
Posts: 6,801
Likes: 7
From: DFW, TX-GoldCanyon, AZ
Don't know if you are still under warranty but with a taller tire, it will affect your odometer and Ford might not like that too much...
Be careful with more aggressive patterns on a dually... if you end up with tire whine and harmonics, it could drive you nuts on a long trip.. Tire Rack may be a good place to check. They used to have a +1 +2 recommendation engine on their website.. Don't know if they still have it or not..
Be careful with more aggressive patterns on a dually... if you end up with tire whine and harmonics, it could drive you nuts on a long trip.. Tire Rack may be a good place to check. They used to have a +1 +2 recommendation engine on their website.. Don't know if they still have it or not..
Super Moderator
Joined: Aug 2008
Posts: 37,377
Likes: 1,861
From: Frederick, MD
I for one would like a bit taller and a switch to some coopers.
It will be starting soon as I notice that they are starting to get down there.
So I will start buying tires and setting them aside.
It will be starting soon as I notice that they are starting to get down there.
So I will start buying tires and setting them aside.
Senior User
Joined: Jul 2010
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Thread Starter
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Cargo Master
Joined: Nov 2005
Posts: 2,051
Likes: 10
From: TEXAS
I'm a pretty big fan of Cooper tires. I run them on our 5th wheel. They are one of the very few American made tires on the market.
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New User
Joined: Feb 2005
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Tire Size, Info for you
Just so you know the ECM on your truck deals with REV PER MILE ( tire revolutions per mile ) if you go to a taller or shorter tire the ECM does not know what to do and a lot of times that screws up the parade. What is tied to this well! Transmission, engine, ABS just to name a few. Next thing you find the truck is not preforming correctly! Imagine that, of course if the dealer can flash the ECM or aftermarket has software that will see the different size tire then life is good. I get to see lots of this mod stuff that turns out bad. Then someone is unhappy.
Just a thought. On my daily driver I run highway tread in all positions, 2 wheel drive limited slip rear end. Can you get this truck stuck, sure can but on a lighter note I pulled out a couple 4 wheel drives that where stuck. One was a red truck and another was a blue truck so maybe a different color is the answer. LOL
Just a thought. On my daily driver I run highway tread in all positions, 2 wheel drive limited slip rear end. Can you get this truck stuck, sure can but on a lighter note I pulled out a couple 4 wheel drives that where stuck. One was a red truck and another was a blue truck so maybe a different color is the answer. LOL
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Hotshot
Joined: Nov 2000
Posts: 11,591
Likes: 14
From: Pflugerville, tx
Just so you know the ECM on your truck deals with REV PER MILE ( tire revolutions per mile ) if you go to a taller or shorter tire the ECM does not know what to do and a lot of times that screws up the parade. What is tied to this well! Transmission, engine, ABS just to name a few. Next thing you find the truck is not preforming correctly! Imagine that, of course if the dealer can flash the ECM or aftermarket has software that will see the different size tire then life is good. I get to see lots of this mod stuff that turns out bad. Then someone is unhappy.
Just a thought. On my daily driver I run highway tread in all positions, 2 wheel drive limited slip rear end. Can you get this truck stuck, sure can but on a lighter note I pulled out a couple 4 wheel drives that where stuck. One was a red truck and another was a blue truck so maybe a different color is the answer. LOL
Just a thought. On my daily driver I run highway tread in all positions, 2 wheel drive limited slip rear end. Can you get this truck stuck, sure can but on a lighter note I pulled out a couple 4 wheel drives that where stuck. One was a red truck and another was a blue truck so maybe a different color is the answer. LOL
so far, I haven't seen any reports of a mechanism to change the tire sire.
dealer or aftermarket
Post Fiend
Joined: Jun 2014
Posts: 6,801
Likes: 7
From: DFW, TX-GoldCanyon, AZ
There are still "some" Cooper tires made in the USA but by and large they have off-shored much of their manufacturing. Presumably to escape the clutches of the EPA and to get cheaper labor.
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Cargo Master
Joined: Nov 2005
Posts: 2,051
Likes: 10
From: TEXAS
It makes me sad to inform you that as of about 2008 this is no longer true. Also - Cooper is no longer an American Company as they were purchased by Apollo Tire of India back a couple years ago.
There are still "some" Cooper tires made in the USA but by and large they have off-shored much of their manufacturing. Presumably to escape the clutches of the EPA and to get cheaper labor.
There are still "some" Cooper tires made in the USA but by and large they have off-shored much of their manufacturing. Presumably to escape the clutches of the EPA and to get cheaper labor.
It's a sad state to have to say things like what you mentioned, but it is the truth... Too many American products have gone off shore due to the far reaching arm of the government control of one aspect or another creating issues.
I did read last week where Ford was moving the production of some of their heavy/medium trucks back to the US from Mexico.
Cargo Master
Joined: Sep 2007
Posts: 2,470
Likes: 535
From: Chandler, AZ
The dealer can re-program mile/rev, however can only select one of the factory available options. So if your truck came with 20" wheels (34" tire) that is already the largest parameter the dealer can choose. I was quoted $50 to do this at local stealership, however after driving awhile on 35.4" (from 32") rubber I found it unnecessary to do so. If I ever have to take my truck to Ford I may reconsider.
Logistics Pro
Joined: Mar 2005
Posts: 2,536
Likes: 200
From: southeast PA
These 255's are the winner for the duallies. Glad to see Cooper picking the size up too. Now to both Cooper and BFG, MAKE THESE TIRES IN A TREAD PATTERN THAT MAKES SENSE FOR A DUALLY! I want to see this size in the Cooper discoverer AT3 and the BFG all terrain. Then I would absolutely buy a set. I have no interest in dedicated mud tires to drag a 5th wheel.
Retired guy fixn stuff
Joined: Mar 2009
Posts: 3,220
Likes: 1,229
From: East TN
I appreciate the link and did look it over carefully. It does a good job as to tire size adjusting the gear ratio.
But, what I am trying to figure out is what would be the largest tire size that I could mount on a DRW and maintain an appropriate clearance between the rear dual tires when under load.
I am not against picking up an inch or two in height if there is sufficient clearance for the larger diameter with out adding a lift kit. I really don't want to go away from the stock suspension set up. Of course if the tire diameter difference were 2" it would only add 1 inch in height.
One thing I did notice on the chart in the link is that it showed the diameter of the stock 245/75-17 tires as being 30.5". The two tire calculators that I used showed the 245/75-17 tire to be 31.45 inch in diameter.
Not looking like there are many options without going full tilt mud/snow.
But, what I am trying to figure out is what would be the largest tire size that I could mount on a DRW and maintain an appropriate clearance between the rear dual tires when under load.
I am not against picking up an inch or two in height if there is sufficient clearance for the larger diameter with out adding a lift kit. I really don't want to go away from the stock suspension set up. Of course if the tire diameter difference were 2" it would only add 1 inch in height.
One thing I did notice on the chart in the link is that it showed the diameter of the stock 245/75-17 tires as being 30.5". The two tire calculators that I used showed the 245/75-17 tire to be 31.45 inch in diameter.
Not looking like there are many options without going full tilt mud/snow.
I have corrected the chart to reflect the correct numbers.
As far as width goes, based on the numbers the 255/80-17 tire would be fine for side clearance. Not sure on level kit, but the tire is not that much bigger than stock.
ZooDad
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Cargo Master
Joined: Nov 2005
Posts: 2,051
Likes: 10
From: TEXAS
LOL,
I wasn't out to dispute the numbers, but in my head I just couldn't get the numbers to register with what I had run myself in the past. So my next step was to pull up a couple of tire calculators.
If I hadn't done so I would have never been able to go to sleep. Strange at the information that can stick in the furthermost back corner of your brain building pressure until it is released. Usually with me it is released as cranial gas, AKA: a Brain Fart.
Thank you for the information and chart, it was a big help.
I wasn't out to dispute the numbers, but in my head I just couldn't get the numbers to register with what I had run myself in the past. So my next step was to pull up a couple of tire calculators.
If I hadn't done so I would have never been able to go to sleep. Strange at the information that can stick in the furthermost back corner of your brain building pressure until it is released. Usually with me it is released as cranial gas, AKA: a Brain Fart.
Thank you for the information and chart, it was a big help.