Is there an official ford guidence for "Approved tire size"?

[ThatPRDude]

I'm part of a local ranger group. A member is having some issues with his drivetrain and took it in for a diagnostic, the ford tech mentioned that since his tires are different from stock if the problem is in the differential it won't be covered by warranty.

I've searched for an official guidance and come up with nothing. So, is there an oficial guide for "aproved" tires sizes?

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[machinist85]

I've heard that if you use a different tire size than what was original or at least a factory option then Ford can deny a warranty claim.

 

[D Fresh]

The Ford Performance Tuner allows you to change the tire size. It is limited to a certain size, although I cannot remember what it is.

I would say that is the largest recommended size.

 

[CO2Ranger]

The short answer is that the Tremor tire size is the max Ford will support officially (32").

Technically the M190 and M210 axles are pretty beefy but it really depends on what you're going to do with them. Nerdy math post from the Bronco boys:
https://www.bronco6g.com/forum/thre...xles-tough-enough-to-turn-35s.2599/post-83679

 

[Trigganometry]

I would guess whatever is on your door jamb sticker is what is the approved size. Anything outside of that it will get challenged

 

[Sanctus Rimor]

I guess it depends on how you go abut it. I have a 6" lift and 33s. Truck was built by an upfitter and ordered through Ford. FMVSS compliant, full factory warranty covering all of it, financeable and insurable. Part of why I went this route.

 

[P. A. Schilke]

I'm part of a local ranger group. A member is having some issues with his drivetrain and took it in for a diagnostic, the ford tech mentioned that since his tires are different from stock if the problem is in the differential it won't be covered by warranty.

I've searched for an official guidance and come up with nothing. So, is there an oficial guide for "aproved" tires sizes?

Hi Franco,

The approved tire is on the left door jamb label along with recommended tire pressure etc.

Best,
Phil

 

[ThatPRDude]

Hi Franco,

The approved tire is on the left door jamb label along with recommended tire pressure etc.

Best,
Phil

Thanks, I figured.

My truck is still stock except for the grill, was just looking to see if there was any other information out there.

 

[Bob902]

If they are denying warranty claims because of changing tire sizes, nobody around here should be getting warranty work done.

 

[SigOris]

Hi Franco,

The approved tire is on the left door jamb label along with recommended tire pressure etc.

Best,
Phil

So a question Phil.

Does that stated PSI the same for all tire MFG’s given the same tire size is used?

in my case, I went from OEM Hanooks to BFG KO2’s but same size.

thanks in advance

 

[Rp930]

The Ford Performance Tuner allows you to change the tire size. It is limited to a certain size, although I cannot remember what it is.

I would say that is the largest recommended size.

I would not assume that to be the case.

 

[mgallo13]

Hi Franco,

The approved tire is on the left door jamb label along with recommended tire pressure etc.

Best,
Phil

Hypothetical for you Phil- how could Ford deny a warranty claim on a differential for example, because I went to a 33" tire with a total increase in unsprung weight 10lbs/whl, when the truck is rated to tow (IE addtl unsprung weight...) 7500 lbs from the factory?

I guess what i'm asking is how is the larger tire any more wear and tear on the vehicle than if I maxed my truck out every day of its life, whether it's payload or towing?...

Edit: math.

stock sport tires 36 lbs + stock rims 27lbs = 63 lbs
wildpeaks 50lbs (p rated) + KMCs 23lbs = 73 lbs

 

[D Fresh]

I would not assume that to be the case.

Ok.

https://performanceparts.ford.com/vehicles/Ranger-packs

Considering it's the same size as the Tremor tire, and also sold by Ford Performance I'd say it's a safe and logical assumption.

It is literally the largest tire size listed by Ford in any remotely official communication regarding the Ranger.

 

[Jason B]

Hypothetical for you Phil- how could Ford deny a warranty claim on a differential for example, because I went to a 33" tire with a total increase in unsprung weight 10lbs/whl, when the truck is rated to tow (IE addtl unsprung weight...) 7500 lbs from the factory?

I guess what i'm asking is how is the larger tire any more wear and tear on the vehicle than if I maxed my truck out every day of its life, whether it's payload or towing?...

Edit: math.

stock sport tires 36 lbs + stock rims 27lbs = 63 lbs
wildpeaks 50lbs (p rated) + KMCs 23lbs = 73 lbs

It's not about weight of the tires, but the additional rotational forces required to turn those tires,
as well as increased stress on suspension parts.

 

[philanderer]

so the tremor comes with 265/70/17? so i should be ok putting this size on my xlt as far as warranty issues are concerned?

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