Abnormal tire tread wear
05-16-08, 10:37 AM
#1
Instructor
Thread Starter
Abnormal tire tread wear
Hey guys.. dont know much about tires so i thought i'd ask what you guys think.
Anybody know what would cause tire wear shown in the pics below?
Any help would be appreciated.
Overview
Abnormal Wear (inside)
Regular Wear (outside)
Anybody know what would cause tire wear shown in the pics below?
Any help would be appreciated.
Overview
Abnormal Wear (inside)
Regular Wear (outside)
05-17-08, 08:33 AM
#6
Hope ya'll got a pen and notebook ready 'cause you're about to get taken to school...
Tire construction 101:
A tire is built in layers - many layers. Oversimplified, when putting a tire together, you put down a layer of inner liner, a fabric carcass ply, some steel belt plies, belt edge strips, then another body ply, then the tread rubber that does not have a tread design on it. This is called a "green" tire. Certain manufacturers will use this same green tire and it end up as different "brands" altogether. But back to tire construction. Once this green tire has been assigned a brand, it gets put into a mold. Once inside the mold a rubber bladder fills up inside the green tire compressing it outwards into the mold. The bladder fills up with hot water, and "cooks" the tire for a predetermined amount of time - this heat process joins all those layers of tire we just talked about. Once the tire is done cooking, it is released from the mold and allowed to cool. Then its checked for trueness, and shipped to me, or someone else for installation on your car.
Now that you know the basics of how a tire is built, you will understand the rest.
When a tire is put into service, it has to contend with heat and all kinds of things. Heat is what put the tire together, unfortunately it will take it apart too.
What happens, is that the layers start to separate from one another. Thus why we in the tire business call defects "separations, or a sepo". Almost all defects are separations. These defects in the tread and belt edge area typically start out very small. Almost no tire blows out immediately due to this type of defect. What happens is the small separation makes the outer diameter of the tire just a little bit bigger in that area. When this goes unnoticed, what you get is rapid treadwear in that area alone. Had that tire been inspected by a good tire guy prior, that may have been caught prior to getting that bad.
So anyways, the tire in question is a belt edge separation.
Now, what caused it? It might just be a defective tire, or... The vehicle might be out of alignment causing the inside edge of the tire to overheat, thus causing a separation that way, but the wear there is definitely NOT due to alignment... I see tires like that on a daily basis, and I've been doing this for a long time. I've also attended seminars given by Michelin, Bridgestone, Goodyear, Discount Tire, and Yokohama with regards to identifying defective tires and other irregular wear patterns.
Tire construction 101:
A tire is built in layers - many layers. Oversimplified, when putting a tire together, you put down a layer of inner liner, a fabric carcass ply, some steel belt plies, belt edge strips, then another body ply, then the tread rubber that does not have a tread design on it. This is called a "green" tire. Certain manufacturers will use this same green tire and it end up as different "brands" altogether. But back to tire construction. Once this green tire has been assigned a brand, it gets put into a mold. Once inside the mold a rubber bladder fills up inside the green tire compressing it outwards into the mold. The bladder fills up with hot water, and "cooks" the tire for a predetermined amount of time - this heat process joins all those layers of tire we just talked about. Once the tire is done cooking, it is released from the mold and allowed to cool. Then its checked for trueness, and shipped to me, or someone else for installation on your car.
Now that you know the basics of how a tire is built, you will understand the rest.
When a tire is put into service, it has to contend with heat and all kinds of things. Heat is what put the tire together, unfortunately it will take it apart too.
What happens, is that the layers start to separate from one another. Thus why we in the tire business call defects "separations, or a sepo". Almost all defects are separations. These defects in the tread and belt edge area typically start out very small. Almost no tire blows out immediately due to this type of defect. What happens is the small separation makes the outer diameter of the tire just a little bit bigger in that area. When this goes unnoticed, what you get is rapid treadwear in that area alone. Had that tire been inspected by a good tire guy prior, that may have been caught prior to getting that bad.
So anyways, the tire in question is a belt edge separation.
Now, what caused it? It might just be a defective tire, or... The vehicle might be out of alignment causing the inside edge of the tire to overheat, thus causing a separation that way, but the wear there is definitely NOT due to alignment... I see tires like that on a daily basis, and I've been doing this for a long time. I've also attended seminars given by Michelin, Bridgestone, Goodyear, Discount Tire, and Yokohama with regards to identifying defective tires and other irregular wear patterns.
Last edited by mitsuguy; 05-17-08 at 04:42 PM.
05-18-08, 10:26 PM
#7
Instructor
Thread Starter
Talk about informative. You are awesome bro! 
He's right, its only on a certain section. Not the whole side.
Thanks for everyones input...
Ko
He's right, its only on a certain section. Not the whole side.
Thanks for everyones input...
Ko
Hope ya'll got a pen and notebook ready 'cause you're about to get taken to school...
Tire construction 101:
A tire is built in layers - many layers. Oversimplified, when putting a tire together, you put down a layer of inner liner, a fabric carcass ply, some steel belt plies, belt edge strips, then another body ply, then the tread rubber that does not have a tread design on it. This is called a "green" tire. Certain manufacturers will use this same green tire and it end up as different "brands" altogether. But back to tire construction. Once this green tire has been assigned a brand, it gets put into a mold. Once inside the mold a rubber bladder fills up inside the green tire compressing it outwards into the mold. The bladder fills up with hot water, and "cooks" the tire for a predetermined amount of time - this heat process joins all those layers of tire we just talked about. Once the tire is done cooking, it is released from the mold and allowed to cool. Then its checked for trueness, and shipped to me, or someone else for installation on your car.
Now that you know the basics of how a tire is built, you will understand the rest.
When a tire is put into service, it has to contend with heat and all kinds of things. Heat is what put the tire together, unfortunately it will take it apart too.
What happens, is that the layers start to separate from one another. Thus why we in the tire business call defects "separations, or a sepo". Almost all defects are separations. These defects in the tread and belt edge area typically start out very small. Almost no tire blows out immediately due to this type of defect. What happens is the small separation makes the outer diameter of the tire just a little bit bigger in that area. When this goes unnoticed, what you get is rapid treadwear in that area alone. Had that tire been inspected by a good tire guy prior, that may have been caught prior to getting that bad.
So anyways, the tire in question is a belt edge separation.
Now, what caused it? It might just be a defective tire, or... The vehicle might be out of alignment causing the inside edge of the tire to overheat, thus causing a separation that way, but the wear there is definitely NOT due to alignment... I see tires like that on a daily basis, and I've been doing this for a long time. I've also attended seminars given by Michelin, Bridgestone, Goodyear, Discount Tire, and Yokohama with regards to identifying defective tires and other irregular wear patterns.
Tire construction 101:
A tire is built in layers - many layers. Oversimplified, when putting a tire together, you put down a layer of inner liner, a fabric carcass ply, some steel belt plies, belt edge strips, then another body ply, then the tread rubber that does not have a tread design on it. This is called a "green" tire. Certain manufacturers will use this same green tire and it end up as different "brands" altogether. But back to tire construction. Once this green tire has been assigned a brand, it gets put into a mold. Once inside the mold a rubber bladder fills up inside the green tire compressing it outwards into the mold. The bladder fills up with hot water, and "cooks" the tire for a predetermined amount of time - this heat process joins all those layers of tire we just talked about. Once the tire is done cooking, it is released from the mold and allowed to cool. Then its checked for trueness, and shipped to me, or someone else for installation on your car.
Now that you know the basics of how a tire is built, you will understand the rest.
When a tire is put into service, it has to contend with heat and all kinds of things. Heat is what put the tire together, unfortunately it will take it apart too.
What happens, is that the layers start to separate from one another. Thus why we in the tire business call defects "separations, or a sepo". Almost all defects are separations. These defects in the tread and belt edge area typically start out very small. Almost no tire blows out immediately due to this type of defect. What happens is the small separation makes the outer diameter of the tire just a little bit bigger in that area. When this goes unnoticed, what you get is rapid treadwear in that area alone. Had that tire been inspected by a good tire guy prior, that may have been caught prior to getting that bad.
So anyways, the tire in question is a belt edge separation.
Now, what caused it? It might just be a defective tire, or... The vehicle might be out of alignment causing the inside edge of the tire to overheat, thus causing a separation that way, but the wear there is definitely NOT due to alignment... I see tires like that on a daily basis, and I've been doing this for a long time. I've also attended seminars given by Michelin, Bridgestone, Goodyear, Discount Tire, and Yokohama with regards to identifying defective tires and other irregular wear patterns.
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05-19-08, 05:33 AM
#9
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Join Date: Jan 2007
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Mitsuguy, very informative. Thanks for the explaination. Also teaches me how to identify a defective tire, at first glance I thought the poster had been doing some drifting on those tires which cause the edge to wear out. Something leared everyday.
Hope ya'll got a pen and notebook ready 'cause you're about to get taken to school...
Tire construction 101:
A tire is built in layers - many layers. Oversimplified, when putting a tire together, you put down a layer of inner liner, a fabric carcass ply, some steel belt plies, belt edge strips, then another body ply, then the tread rubber that does not have a tread design on it. This is called a "green" tire. Certain manufacturers will use this same green tire and it end up as different "brands" altogether. But back to tire construction. Once this green tire has been assigned a brand, it gets put into a mold. Once inside the mold a rubber bladder fills up inside the green tire compressing it outwards into the mold. The bladder fills up with hot water, and "cooks" the tire for a predetermined amount of time - this heat process joins all those layers of tire we just talked about. Once the tire is done cooking, it is released from the mold and allowed to cool. Then its checked for trueness, and shipped to me, or someone else for installation on your car.
Now that you know the basics of how a tire is built, you will understand the rest.
When a tire is put into service, it has to contend with heat and all kinds of things. Heat is what put the tire together, unfortunately it will take it apart too.
What happens, is that the layers start to separate from one another. Thus why we in the tire business call defects "separations, or a sepo". Almost all defects are separations. These defects in the tread and belt edge area typically start out very small. Almost no tire blows out immediately due to this type of defect. What happens is the small separation makes the outer diameter of the tire just a little bit bigger in that area. When this goes unnoticed, what you get is rapid treadwear in that area alone. Had that tire been inspected by a good tire guy prior, that may have been caught prior to getting that bad.
So anyways, the tire in question is a belt edge separation.
Now, what caused it? It might just be a defective tire, or... The vehicle might be out of alignment causing the inside edge of the tire to overheat, thus causing a separation that way, but the wear there is definitely NOT due to alignment... I see tires like that on a daily basis, and I've been doing this for a long time. I've also attended seminars given by Michelin, Bridgestone, Goodyear, Discount Tire, and Yokohama with regards to identifying defective tires and other irregular wear patterns.
Tire construction 101:
A tire is built in layers - many layers. Oversimplified, when putting a tire together, you put down a layer of inner liner, a fabric carcass ply, some steel belt plies, belt edge strips, then another body ply, then the tread rubber that does not have a tread design on it. This is called a "green" tire. Certain manufacturers will use this same green tire and it end up as different "brands" altogether. But back to tire construction. Once this green tire has been assigned a brand, it gets put into a mold. Once inside the mold a rubber bladder fills up inside the green tire compressing it outwards into the mold. The bladder fills up with hot water, and "cooks" the tire for a predetermined amount of time - this heat process joins all those layers of tire we just talked about. Once the tire is done cooking, it is released from the mold and allowed to cool. Then its checked for trueness, and shipped to me, or someone else for installation on your car.
Now that you know the basics of how a tire is built, you will understand the rest.
When a tire is put into service, it has to contend with heat and all kinds of things. Heat is what put the tire together, unfortunately it will take it apart too.
What happens, is that the layers start to separate from one another. Thus why we in the tire business call defects "separations, or a sepo". Almost all defects are separations. These defects in the tread and belt edge area typically start out very small. Almost no tire blows out immediately due to this type of defect. What happens is the small separation makes the outer diameter of the tire just a little bit bigger in that area. When this goes unnoticed, what you get is rapid treadwear in that area alone. Had that tire been inspected by a good tire guy prior, that may have been caught prior to getting that bad.
So anyways, the tire in question is a belt edge separation.
Now, what caused it? It might just be a defective tire, or... The vehicle might be out of alignment causing the inside edge of the tire to overheat, thus causing a separation that way, but the wear there is definitely NOT due to alignment... I see tires like that on a daily basis, and I've been doing this for a long time. I've also attended seminars given by Michelin, Bridgestone, Goodyear, Discount Tire, and Yokohama with regards to identifying defective tires and other irregular wear patterns.
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