Driver side rear tire wear

[7Andrei7]

I noticed you said it's 265 as opposed to the 255 standard tires. This increased the overall diameter of the wheel and probably threw off your alignment.
Did you also change the width of the front tires?

 

[Ahawk1968]

I would beg to differ with a slight increase in section width throwing off the alignment to that extent. The overall diameter stayed the same as well. And yes, the fronts went to 235s
I did get the vehicle aligned and almost all the specs were off..
As soon as I get a chance I will post the alignment specs..

 

[D.J.]

and probably threw off your alignment.

What adjustable alignment characteristic is changed by tire width?

The overall diameter stayed the same as well.

How could the overall diameter stay the same?

 

[JSolo]

I think for a proper apples/apples comparison we need to know the exact model & sizes of the tires in question. Specs are readily available from the mfg or tire rack for overal diameter. So long as the diameter differences front to rear are the same as stock, IMO alignment should not change.

 

[7Andrei7]

What adjustable alignment characteristic is changed by tire width?

Well, if for example he had only changed the width of the rears it would mean the car would be slightly on the nose. I know 255 to 265 is just 8 mm increase in wheel diameter but it could technically throw off the car's alignment.
I agree, not to the point of causing such damage, but that's why I asked about the other tires.

 

[Ahawk1968]

Sorry I should have mentioned...tires are Michelin Pilot Sport All Season 4's. 265 35 19 and 235 40 19. Rear tire specs are negligible diameter difference not enough to cause such wear..
Again.. let me also post the alignment specs as soon as I am able...

 

[Ahawk1968]

..and front tire spec. comparison ..
Negligable diameter difference also..

 

[Ahawk1968]

Alignment specs..

 

[SRV]

Alignment specs..

It looks like the smoking-gun here is the 'before' passenger rear camber specs.

That's a lot of negative camber.

 

[D.J.]

It looks like the smoking-gun here is the 'before' passenger rear camber specs.

That's a lot of negative camber.

Except...

This thread is about a driver side rear tire.

 

[SRV]

Except...

This thread is about a driver side rear tire.

That's not what he said here though:

The rear passenger is the only one showing the crazy wear.

 

[D.J.]

That's not what he said here though:

Lol.... And then in another post in this thread, back to driver ..

Clear as mud

Nope, no vibration. No pulling, no unusual sounds... As for the burnout thing, keep in mind this is a 2018 GT-1 rwd, so it has an open differential, this was the rear DRIVER side tire. With an open diff, you are going to roast the PASSENGER rear.

 

[StingertimeNC]

I've run -2 degrees camber in the rear on my last 5 cars. never seen anything like that before. you will notice the inner wear for sure, but bald on the inside and full tread on the outside is unusual. I think it's something else. Toe is usually the culprit on sever issues isn't it?

 

[D.J.]

I've run -2 degrees camber in the rear on my last 5 cars. never seen anything like that before. you will notice the inner wear for sure, but bald on the inside and full tread on the outside is unusual. I think it's something else. Toe is usually the culprit on sever issues isn't it?

Yes it is.

This was more like a tire belt that had a very uncommon break

 

[Ahawk1968]

It was the driver side rear, my fault. Alignment shop said it was more so the toe in the rear combined with camber that caused the wear.

 

[Ahawk1968]

So I had replaced all tires on our 2018 GT-1 about 10 months ago... Went back to the tire shop for screw in the tire and they showed me this.... WTH!!
The screw was in the opposite side tire, I had no idea this was going on as well ...

Tires are all season Michelin and have 10k miles on them. The rear DRIVER side is the only one showing the crazy wear. No, the car is not driven hard nor is it lowered. Occasionally getting on it but not smokey burnouts ...

Any ideas as to why? The tire will be replaced then aligned.

 

[MerlintheMad]

^^^Short on sleep?

 

[Rodtheviking]

That drivers rear toe will cause some bad wear, toe is a tire killer. You are basically dragging the inside if the tire down the road.

 

[Ahawk1968]

Merlin, absolutely. Isn't everyone?. Rod, absolutely... Now I know.
Hopefully I will have helped someone else with similar problems. I will also take advise I have always heard which I never always did... Get a freakin' alignment with those new tires!

 

[MerlintheMad]

Merlin, absolutely. Isn't everyone?. Rod, absolutely... Now I know.
Hopefully I will have helped someone else with similar problems. I will also take advise I have always heard which I never always did... Get a freakin' alignment with those new tires!

You already made me aware of toe. When I get my A/S and OEM wheels put back on in one to three months (a window I have used in the past ), I'll have my first alignment performed since I bought the car (going on five years). But this conversation only reinforces something that I've noticed very recently: on my road trip to Milwaukee and back (four full days of high speed driving) I felt a very slight vibration/shudder above 80 MPH: it would get more rapid without getting much worse the faster I went. I'm sure I touched 120 MPH passing fast a number of times, yet the vibration didn't intensify to the degree that my speed increased (didn't seem to keep pace with the higher speed: at c. 90 MPH, I would expect, for the level of vibration, that by 110 MPH the vibration would be a lot worse than it is).

So, wanting to get to the bottom of this, I just returned from my tire and wheel guys, and they got the car in the air and immediately saw the cause: the rear tires have inner edge feathering/cupping. The pic doesn't show it, but I include it to show where my inner edge rear tire wear is at: it's even on both sides, this is the RR tire. When the tires are rotating in the air, you can easily see the inner edges dipping and rising as the cupped areas go around. I also have a slightly bent RR wheel, you can see the outer edge moving in and out c. 3/32nds of an inch (no clue when/how that occurred).

The bent wheel isn't the culprit, though (just something I will attend to when I change wheels): it is toe, pulling at the inside edges just like @Ahawk1968 's, but not nearly as bad. When I get this taken care of quite a bit later (too late to save the rear tires, and so I will just finish wearing them out: got plenty of time at this rate ), when I get the alignment done, I'll try to remember to give an update.