Tyre wear question
Discussion
E-bmw said:
Hard to tell without a tread gauge but they look pretty evenly worn to me.
The "missing" bit of tread from 1/2 way through the right hand tread block ring shown looks like the tread pattern if that is what you are thinking is a flat spot.
The tyres are all worn even, except on that flat spot towards the inner edge. Its totally flat. The "missing" bit of tread from 1/2 way through the right hand tread block ring shown looks like the tread pattern if that is what you are thinking is a flat spot.
Its now done it with the second set rears on the same corner. I
Munter said:
Wheel bearing? I'd have thought alignment would affect the whole tyre, not one spot. So what's going to stay inline with that flat spot. Hub/part of the bearing, brake disk, wheel rim...err...
I know... I'm keeping the can of petrol close at hand...I've not rotated them other than from front axle to the rear, to try and get as much out of them as I can.
I had them new on the front from January 2016, moving them to the rears in March 2017. On the front, they wear fine across the pattern. So after maybe 20k+ and a year on the rear, the flat spot develops. So I've actually had a pretty good innings with them I think.
Previous to that it was the original Michelins that came with the car I think
nhudson1 said:
E-bmw said:
Hard to tell without a tread gauge but they look pretty evenly worn to me.
The "missing" bit of tread from 1/2 way through the right hand tread block ring shown looks like the tread pattern if that is what you are thinking is a flat spot.
The tyres are all worn even, except on that flat spot towards the inner edge. Its totally flat. The "missing" bit of tread from 1/2 way through the right hand tread block ring shown looks like the tread pattern if that is what you are thinking is a flat spot.
Its now done it with the second set rears on the same corner. I
What you quite often find with tyres is that there is a "sacrificial" upper tread that when half/2.3 worn isn't full depth like the rest & so you can tell it is half/2/3 worn.
ETA.
New Potenza
Part worn Potenza
Edited by E-bmw on Wednesday 6th June 11:31
E-bmw said:
Like I said, that just looks like the tread pattern & seems fine to me, especially if the tread depth is even you have just backed that up in your own findings, there is nothing wrong with that tyre.
What you quite often find with tyres is that there is a "sacrificial" upper tread that when half/2.3 worn isn't full depth like the rest & so you can tell it is half/2/3 worn.
ETA.
New Potenza
Part worn Potenza
You can see one radial tread is fine at the top of the picture, go's to almost nothing in the middle, then comes back to fine.What you quite often find with tyres is that there is a "sacrificial" upper tread that when half/2.3 worn isn't full depth like the rest & so you can tell it is half/2/3 worn.
ETA.
New Potenza
Part worn Potenza
Edited by E-bmw on Wednesday 6th June 11:31
What you are showing in your pics E-BMW is not the same thing. I can see what the OP is saying has happened. But I've not heard of it before (unless one big locked up stop). If there were several flat spots it might be worn shocks, but just one. That's odd.
The obvious causes for uneven wear are distorted hubs/rims/tyres leaving a high spot on the tyre which would increase wear at that spot - eventually, they would wear back until the outer surface returns to a round shape. The pictures show the outer face of the tyre has a definite flat spot. The only reason I can think of for that is that the tyre is sliding more at that spot than elsewhere. One cause of that is a high spot on the brake causing slightly more braking at that point. It might not be obvious to the driver since the rear brakes do relatively little work under heavy braking.
I suppose it could also be something in the rear suspension allowing the wheel alignment to go out under heavy cornering. If this caused the rear suspension to 'wind up'' (since the rear wheels are no longer parallel) one wheel would eventually slide to relieve the force, and this wind-up/slide sequence could happen repeatedly under the right conditions. Any flat spot on the tyre would reduce the grip at that point making it more likely to the slide would occur at the same spot, increasing wear there and reducing grip in a vicious spiral.
I suppose it could also be something in the rear suspension allowing the wheel alignment to go out under heavy cornering. If this caused the rear suspension to 'wind up'' (since the rear wheels are no longer parallel) one wheel would eventually slide to relieve the force, and this wind-up/slide sequence could happen repeatedly under the right conditions. Any flat spot on the tyre would reduce the grip at that point making it more likely to the slide would occur at the same spot, increasing wear there and reducing grip in a vicious spiral.
Thanks for the replies.
I'm baffled.
Its an underpowered 1.6 TDCI Ford Focus, it spends 80 % of its life on the motorway and I more of a MPG driver than a 0-60 driver lol.
The tyre in question is the nearside rear, it has drums and I can't remember the last time I had to slam on the anchors, but never into a skid.
I would have possibly have gone with it being a dodgy tyre, but as this is the second time, on the same corner... I'm out of ideas.
I normally rotate my tyres front to back once they get to about halfway through the thread and replace the fronts with new and during their time on the front, I've never had an issue. No repairs, no flats, balancing and tracking have always been fine.
Then I start hearing the drone "wom, wom, wom" when going slowly on decent roads.
I'm baffled.
Its an underpowered 1.6 TDCI Ford Focus, it spends 80 % of its life on the motorway and I more of a MPG driver than a 0-60 driver lol.
The tyre in question is the nearside rear, it has drums and I can't remember the last time I had to slam on the anchors, but never into a skid.
I would have possibly have gone with it being a dodgy tyre, but as this is the second time, on the same corner... I'm out of ideas.
I normally rotate my tyres front to back once they get to about halfway through the thread and replace the fronts with new and during their time on the front, I've never had an issue. No repairs, no flats, balancing and tracking have always been fine.
Then I start hearing the drone "wom, wom, wom" when going slowly on decent roads.
nhudson1 said:
[url]
|https://thumbsnap.com/34jJxog2[/url]To be honest, if 2 sets have ended the same way it obviously can't be the tyres.
That leaves basically suspension/hub/wheel, one of them MUST be causing it.
You need someone who knows what they are looking at/for under the car with a fine tooth comb.
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