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Hey guys, this is my first time posting in the GLC group. I mostly post in the W204 and W124 group, but that has been some time.
Car Info: 2019 GLC 300, 60K miles or so.
I searched the forum for this, but didn't find much. The front tires seem to have chunks missing from them (See Pictures, apologies, the resolution came out pretty high). The rear tires are perfectly fine. I contacted the dealership, and they really didn't give me anything except to bring it in. When I Googled a bit, I found some things pop up regarding the geometry being off on the car. The car drives straight, and I do not have any odd tire wear with it. I check the tire PSI regularly, and the car isn't driven a lot. Pictures attached of the tires currently.
The only thing that comes to my mind is maybe bearings? Do those fail or go out this early on the car? Note, no noise or odd behavior from the front is happening.
It looks like you have Summer tires (not All-season) that it been operated below 45°F.
Rubber on summer tires is specialized and doesn't work well in freezing temperatures. Chunking can be the result.
These actual pictures were taken at the end of October, before the temperatures went down. I have had this problem for some time no,w across the summer. I am not certain what type of tires these are, if they are summer-only or not. I will check that.
2014 ML63, 2018 GLC43, 1929 DB victory six sports roadster
That looks pretty bad I’ve only ever seen something like that on an off road tyre. I would say it’s a faulty tyre that shouldn’t happen even with a bad alignment.
That looks pretty bad I’ve only ever seen something like that on an off road tyre. I would say it’s a faulty tyre that shouldn’t happen even with a bad alignment.
That was my first impression, but it happened on two front tires.
A six or seven year old tire is nearly aged out, so that could be an issue as well.
If the tires were rotated from the rear and the car was overloaded, could be another reason.
Hey guys, this is my first time posting in the GLC group. I mostly post in the W204 and W124 group, but that has been some time.
Car Info: 2019 GLC 300, 60K miles or so.
I searched the forum for this, but didn't find much. The front tires seem to have chunks missing from them (See Pictures, apologies, the resolution came out pretty high). The rear tires are perfectly fine. I contacted the dealership, and they really didn't give me anything except to bring it in. When I Googled a bit, I found some things pop up regarding the geometry being off on the car. The car drives straight, and I do not have any odd tire wear with it. I check the tire PSI regularly, and the car isn't driven a lot. Pictures attached of the tires currently.
The only thing that comes to my mind is maybe bearings? Do those fail or go out this early on the car? Note, no noise or odd behavior from the front is happening.
Any thoughts would be greatly appreciated.
Chunking like that is typically from aggressive driving. The heavy front end of the GLC stresses the front tires during hard cornering and braking. Factory all-season tires have a softer compound that can tear.
Since the rears are fine and alignment is good, it's not a bearing or geometry issue. Those would cause noise or uneven wear. This is just the tires being overworked.
You need new front tires. Consider a higher-performance grade if you drive hard. The dealership will see this as normal wear and tear.
That looks pretty bad I’ve only ever seen something like that on an off road tyre. I would say it’s a faulty tyre that shouldn’t happen even with a bad alignment.
The car has never been off-road. It always is on regular paved roads.
Originally Posted by mikapen
That was my first impression, but it happened on two front tires.
A six or seven year old tire is nearly aged out, so that could be an issue as well.
If the tires were rotated from the rear and the car was overloaded, could be another reason.
These tires on the car are only about 3 or 4 years old. It came with the car when it was purchased as a CPO. It has only had about 16K miles put on it since.
Originally Posted by Gazam
Chunking like that is typically from aggressive driving. The heavy front end of the GLC stresses the front tires during hard cornering and braking. Factory all-season tires have a softer compound that can tear.
Since the rears are fine and alignment is good, it's not a bearing or geometry issue. Those would cause noise or uneven wear. This is just the tires being overworked.
You need new front tires. Consider a higher-performance grade if you drive hard. The dealership will see this as normal wear and tear.
The car is barely driven. This is my mother's car. She will barely get up to the speed limit with it. Even on top of that, she drives even slower since she always has a small dog riding in the passenger seat.
The car has never been off-road. It always is on regular paved roads.
....
These tires on the car are only about 3 or 4 years old. It came with the car when it was purchased as a CPO. It has only had about 16K miles put on it since.
....
The car is barely driven. This is my mother's car. She will barely get up to the speed limit with it. Even on top of that, she drives even slower since she always has a small dog riding in the passenger seat.
Well you've answered questions A, B and C, generating another question from me.
Have the tires been properly inflated, and if so, has the TPMS sensor warning been reset to the appropriate PSI? (To ensure notification if there is pressure loss.)
Well you've answered questions A, B and C, generating another question from me.
Have the tires been properly inflated, and if so, has the TPMS sensor warning been reset to the appropriate PSI? (To ensure notification if there is pressure loss.)
I check it regularly. I follow what the car says, Front 35, Rear 42.
I did find a service bulletin that references this issue regarding front end geometry. I’m waiting to see what it actually says to do to fix this issue.
TSB LI40.10-P-058472
I will keep you guys updated of my findings with this.
I check it regularly. I follow what the car says, Front 35, Rear 42.
I did find a service bulletin that references this issue regarding front end geometry. I’m waiting to see what it actually says to do to fix this issue.
TSB LI40.10-P-058472
I will keep you guys updated of my findings with this.
Our '19 GLC with 19" (Runflat) tires shows 36/36 recommended pressures on the gas flap.
It sounds like you're using the driver's door post sticker, which would be the wrong setting. Not that it would cause this situation.
Does your Mom have 19" runflats? If not, the gas flap will be different.
Are you sure that the TSB doesn't refer to the transmission?
Mysteries abound.
Our '19 GLC with 19" (Runflat) tires shows 36/36 recommended pressures on the gas flap.
It sounds like you're using the driver's door post sticker, which would be the wrong setting. Not that it would cause this situation.
Does your Mom have 19" runflats? If not, the gas flap will be different.
Are you sure that the TSB doesn't refer to the transmission?
Mysteries abound.
I see what you are saying. I didn’t ever look at the gas door numbers. The car has 20 inch wheels. I do believe that they are run flat as there is not a spare on-board.
When I spoke with the Mercedes dealership yesterday, they said that Service bulletin is in reference to front end geometry.
AI says old car tires can lose chunks of rubber due to age related rubber degradation...starting around 5-6 years old. Your grandma's car need new shoes.
AI says old car tires can lose chunks of rubber due to age related rubber degradation...starting around 5-6 years old. Your grandma's car need new shoes.
These aren’t the tires that came with the car. They are 3-4 years old. They aren’t dry rotted or anything of that nature. I do not believe that this is an issue regarding the tires itself.
These aren’t the tires that came with the car. They are 3-4 years old. They aren’t dry rotted or anything of that nature. I do not believe that this is an issue regarding the tires itself.
Based on the questions and answers in this thread, I agree. I think it's tire failure.
There's a four digit DOT code on the sidewall of the tire. The first two digits represent the week of the year of manufacture and the second two-digit represents the year of manufacture. A good practice is to get a look at the tires before they get mounted and check the date is less than 12 months old. Why give up a year unless you were going to wear them out in 4 years anyway. Doesn't make sense to me to pay the same price for older tires.
Obviously, these tires must be replaced so get fresh ones.
Based on the questions and answers in this thread, I agree. I think it's tire failure.
That makes the most sense. Its just puzzling that its just the front tires. Not the rears.
Originally Posted by no_mulligan
Can you confirm the age by interpreting the code on the sidewall? What tire expert said it wasn't the tire?
I will get this and post a little later.
Originally Posted by sn202020
Just "Clunking" and a couple of blurry tire picture are not enough information.
It could be the tire, engine mount or other suspension parts.
What's wrong with my pictures mate? They look reasonable to me. Also, I doubt engine mount. I would notice it more in other places rather than tires.
Originally Posted by no_mulligan
There's a four digit DOT code on the sidewall of the tire. The first two digits represent the week of the year of manufacture and the second two-digit represents the year of manufacture. A good practice is to get a look at the tires before they get mounted and check the date is less than 12 months old. Why give up a year unless you were going to wear them out in 4 years anyway. Doesn't make sense to me to pay the same price for older tires.
Obviously, these tires must be replaced so get fresh ones.
Yeah, I understand that. These came with the car when it was purchased as a CPO. Typically, I have more control over the tires when I purchase them myself.
That puts it right at 4 years old. Replace immediately.
Six years is the standard age-out number.
It's important if you don't exercise the tires. Carbon black migrating throughout the tire prolongs life.
I don't think that's the problem here, though. Looks failure-esque.
We bought a CPO 2021 GLC 300 4matic with 46,500 kms. It came with these exact tires and size. They were chunking in exactly the same fashion as yours. I did a lot of searching only to find out it is a common problem with these Goodyears in general and especially on a GLC. I dumped them 5,000kms. later for a set of Michelin Cross Climates for all weather use and have been very happy so far and so is the wife. I had the alignment checked at installation and it was in spec. Just a poor tire. These were factory installed tires during the Covid years with supply problems and they took what they could get.
We bought a CPO 2021 GLC 300 4matic with 46,500 kms. It came with these exact tires and size. They were chunking in exactly the same fashion as yours. I did a lot of searching only to find out it is a common problem with these Goodyears in general and especially on a GLC. I dumped them 5,000kms. later for a set of Michelin Cross Climates for all weather use and have been very happy so far and so is the wife. I had the alignment checked at installation and it was in spec. Just a poor tire. These were factory installed tires during the Covid years with supply problems and they took what they could get.
Thanks for this information. Since my issue was only on the fronts, I had them rotated. I am going to monitor the wear pattern and see how it performs from here. Chances are I will go to Michelins at some point since that is the brand I typically prefer to use.
Thanks for this information. Since my issue was only on the fronts, I had them rotated. I am going to monitor the wear pattern and see how it performs from here. Chances are I will go to Michelins at some point since that is the brand I typically prefer to use.
Ours were front only as well but couldn’t stand the harsh ride of the runflats any longer. Car came with spare and jack so normal tires now and nicer ride.
These aren’t the tires that came with the car. They are 3-4 years old. They aren’t dry rotted or anything of that nature. I do not believe that this is an issue regarding the tires itself.
Tires are spent. They aren’t maintained well either (brown/red brake dust visible).
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