Just rotated my tires for the first time this morning at about 6,700 miles. The rears are wearing pretty even but the fronts were noticeably more worn on the inside of the tire than on the outside.

What would cause this?

 

Might be too much negative camber in your alignment

 

Do you frequently carry heavy loads ??

I had to recently replace my tires at just 30,000 miles. I rotated every 5000 miles. 15,000 miles pulling a 5th wheel camper which of course makes the back end sag some, throwing off the geometry of the front end. I checked back through my records, and on most of my longer camper trips the worn tires were on the front end. The other tires were in much better shape.

I had the alignment checked with an empty truck, and everything checked out with that.

P.S. I am a very conservative driver and do not take corners fast, plus I monitor my tire pressures.

 

No heavy loads but I did do a 1.5” level.

 

did you have an alignment done after the level? If not that’s more than likely where the problem is.

 

Check Toe. I have 1* negative camber with no wear like that. 5k on this rotation. I tow 16k couple times a month.

 

Or significant rubbing on something? Fender well?

 

Toe-in checked out fine. My tire guy said he could increase toe a bit, but then the truck may not track as good.

There is apparent no rubbing. Those are OEM tires with no lift.

 

That really looks like toe out.

 

Smoking Joe is correct. Wear on the inside of both tires is going to be excessive toe out. Too much negative camber can contribute to uneven wear, but the main culprit by far is going to be the toe setting.
I got 30+ years in automotive, including wheel alignment (both custom alignment and "set it in the green" alignments), so the above is a general but solid guide to go by.

 

Question: is your tire guy using an alignment rack that's big enough to actually get your truck on and do a full alignment?

My experience is that a LOT of shops can't actually do alignments on Super Duties (or anything bigger than a CCSB half-ton) because their alignment racks aren't big enough. It's actually pretty important that they get the entire truck up there and know where the rear wheels are because, even though they can't DO anything about where your rear tires sit, the relationship of all four tires is important to have a proper alignment and for the vehicle to track properly. If they can't measure where the rear tires are at, they can't accurately set anything on the front end, because they don't know where the vehicle in total is sitting.

When I lived down state, there were TWO shops that I knew of, other than dealerships, that had alignment racks big enough to handle Super Duties, that weren't big-rig shops (that come with big-rig prices). I had one place set me up an appointment for tires and a rotation, I TOLD them what truck I had (at the time a SCSB), and it wasn't until after the tires were mounted on the truck that they told me they couldn't check the alignment because it was too big for their rack.

 

What tire pressure are you at? Low pressure can cause wear on the outside of the tires.

 

Thanks for all of the suggestions, and sorry to hijack the thread.

I always keep my tire pressures inflated to the door sticker information.

I am not sure what exactly went on at my tire shop, but did say everything was within specs. They put it on their rack, but did not continue on with the alignment because the alignment guy saw the box behind my mirror and thought I had lane departure assist. Lane departure assist alignments apparently require a special high dollar alignment rack.

I will check with other alignment shops to see who can do a full alignment on a Super Duty.

Again, thanks to all for the suggestions.

 

Good idea since that shop doesn't even know that these trucks aren't available with lane departure assist. They can have lane departure alert, totally different than assist. No special alignment rack needed.

 

So, SFA tire wear as described and shown is unrelated to cornering exuberance, loading or tire pressures. It is improperly set toe and too many shops are selling customers a line of stuff. IFS could have improper camber as well, but not for the SD. Dealerships have the proper equipment and if you can't trust a local shop I would go to the dealer. My pops would always explain to a customer what was going on with their tires and suspensions. Sometimes we brought them into the alignment bay to show them if it was a problem case. Integrity is getting harder to come by in automotive field. Dealerships included, but at least they start with the correct tools and information. Special alignment for lane departure assist??? Nice.