Inner tire wear

[metoo]

I have 255/40/21 Pilot Sport 4S tires on 21x9 et38 wheels which fit dead flush. The backspacing measure 165mm. On paper, they are 0.3" larger in diameter than the stock MachEGTPE shoes and the inward wall of the tire, on paper, is 2mm further from the strut. I dont see anything on the car the tires rubbed against. At full steering lock and the suspension fully extended (on a lift) I can see where th tir could potentially touch, the wheel well liner, but there is no wear there or anywhere on the wheel wells. I know I've see other flush setups with even wide tires, so if mine rubs, there's should be destructive. Im gonna get an alignment when I get the new tires on to see if that helps.
Pics: 1) 2 of the tires, but all have the wear due to rotating and not noticing the wear during rotation. 2) Pointing at the spot that I think is the closest to making contact at full lock, but there is no wear. There's actually a tiny dead brown bettle there that isnt smashed. 3) a blurry pic showing the wheel at full lock and how close it comes to the liner...at full suspension extension. 4) another pic of the liner where ai see no issues...well maybe a screw that stick into the wheel well (not pictured)?

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[markboris]

I don’t think this would be the cause of your problem but your tires are just below the load rating recommended by Ford.

I do have wider tires than you and don’t have this issue. I run a more negative camber than it comes from the factory with but it’s still within Ford’s specs.

I would definitely have your alignment checked

 

[Mach1E]

If they were rubbing, you would see where they hit.

What psi are you running? I run 36 and my front stock GTPE tires look similar after only 6900 miles. Lots of wear on the sides.

 

[metoo]

If they were rubbing, you would see where they hit.

What psi are you running? I run 36 and my front stock GTPE tires look similar after only 6900 miles. Lots of wear on the sides.

38-40psi

Dang, that's only 6900 miles? I thought I hit corners aggressively. I assume its cornering and/or off-the-line acceleration for me.

 

[metoo]

I don’t think this would be the cause of your problem but your tires are just below the load rating recommended by Ford.

I do have wider tires than you and don’t have this issue. I run a more negative camber than it comes from the factory with but it’s still within Ford’s specs.

I would definitely have your alignment checked

I thought about the load index, but its way too close in my opinion. The only tires that my size with over 102 is the same tire OEM Mercedes, with a 105.

 

[markboris]

If you corner aggressively, I would definitely add a bit more negative camber like I do to keep things a bit more even.

 

[HuntingPudel]

This wear is on the inboard side of the tire? Or is it on both of the shoulders? Only on the fronts? Only on the rears? ??

 

[markboris]

This wear is on the inboard side of the tire? Or is it on both of the shoulders? Only on the fronts? Only on the rears? ??

Good point. I assumed it was on the outside not the inboard since he mentioned he corners hard that is why I suggested the negative camber. Now I see it looks like the inboard tread. I still think an alignment would tell what is going on.

 

[Mach1E]

Update for my 6900 mile tire wear.

Did an alignment. Didn’t seem like they changed much, but you tell me. Here are the before/after-

 

[azerik]

I think you're rubbing either something in the well or the strut in the front. I can't think of anything in the rear that could rub like that. It's quite possible that while looking at the car with the wheels straight it all clears. On a hard left or right you're hitting something with a 30~45 degree angle that's sharp.

If it we me, I'd hang the front end off a curb, wheels still on the curb, (or even a speed bump but that's a lot harder to come by than your driveway) turn the wheel full lock. AND have someone hold it there, you'll need the key on to do it. When you key of the steering unwinds about 1/4 turn or more. I assume this is on purpose but mine has done it from day 1. Anyway, at full lock lay under the front and look for contact points. This is my thought based on the wear on that fender liner. Probably can see it at full lock but it might need the suspension to be compressed slightly to make contact.

 

[metoo]

If you corner aggressively, I would definitely add a bit more negative camber like I do to keep things a bit more even.

That would put even more pressure on the inside tread....assuming you mean leaning the top of the tires more inboard.

 

[markboris]

That would put even more pressure on the inside tread....assuming you mean leaning the top of the tires more inboard.

Yes you are correct. I actually didn’t read your title properly and was thinking it was the outside tread since I’ve had a few others with that problem. Disregard my comment on that.

 

[metoo]

I think you're rubbing either something in the well or the strut in the front. I can't think of anything in the rear that could rub like that. It's quite possible that while looking at the car with the wheels straight it all clears. On a hard left or right you're hitting something with a 30~45 degree angle that's sharp.

If it we me, I'd hang the front end off a curb, wheels still on the curb,....

I'll take your suggestion. That area circled is several inches from the tire. Above it, however, on the liner, it seems there may be in contact [full lock on level ground]. The contact there is relatively light and the liner isnt backed. Just in case, Im going to dent the liner in that location. Yes, the steering tries to turn back a little from full lock once you let go of the steering wheel. You can reduce it by a good bit by driving forward a bit before letting go. The angle will only change a lil bit.

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