tire damages causes & avoidance dec09

8/2/2019 Tire Damages Causes & Avoidance Dec09

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Corporate Customer Service

Cesar Maldonado December 2009

Tire damages: Causes and avoidance

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Tire damage: Causes and avoidance


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Inflation pressure and load capacity Load capacity Influence of tire inflation pressure

Consequences of low inflation pressure

How to recognize tires which have been driven underinflated

Damage due to external influences

Impact damage Sidewall indentation Puncture due an external object Repaired tires Mounting Damages

Wear Slip causes wear

One sided wear Feather-edged wear Saw-tooth or heel and toe wear

Contents


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Load capacity of inflated tires

The theoretical load capacity of an inflated tire is determined by: Tire air volume tire dimensions

maximum permitted air pressure tire construction (i.e. standard load, XL, vantires)

The effective load capacity is proportional to the product of tire air volume and the air

pressure.

Influence of inflation pressure

VolumeAir pressure


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Many car drivers drive with wrong tire inflation pressures(Source: Continental study)

Important: Tire pressure


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Tire life expectancy and tire durability depend directly on the inflationpressure



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Heat service camera


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106.6

96.7

outside

*>140.0F

*


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113.7

100.7

outside

*>140.0F

* 60 C

45C37C


Inflation pressure 2,4 bar


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121.4

105.7

outside

*>140.0F

* 60 C




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121.4

105.7

outside

*>140.0F

* 60 C


130.5

116.1

*>140.0F

* 60 C

55C

46C

60 C

55 C

50 C

45 C

40 C

35 C

30 C



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121.4

105.7

outside

*>140.0F

* 60 C


130.5

116.1

*>140.0F

* 60 C

55C

46C

60 C

55 C

50 C

45 C

40 C

35 C

30 C

148.9

138.5

*>149.0F

* 60 C



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Tires have a memory

Even at only 0,3 bar below the recommended inflation pressure, the tire temperature could exceed 120C

at higher speedsMaintaining the recommended inflation pressure keeps the temperature stable and within thenormal range.

Critical

Temperature limit

10 20 30 40 50 60 70 80

DangerousZone

StandardZo

ne

Driving time (min)



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Inflation pressure strongly influences Tire durability

Fuel consumption Handling Even wear and mileage Traction and braking

Our recommendation is to check and if necessary adjust the tire inflation pressure every twoweeks.

The same recommendation also applies for tires filled with nitrogen



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How to recognize tires driven with low inflation pressure


Deep or wide indentations in the bead area caused by rubbing against the rim flangeindicate poor pressure maintenance.


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How to recognize tires driven with low inflation pressure


Double sided shoulder wear


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Possible consequences of driving with low inflation pressure


Uneven wear may indicate belt separation.


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Parts of the tire have

separated as

a result of poor pressuremaintenance.


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Tire destroyed by driving withtoo low inflation pressure


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Damage due to external factors


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Impact break

Tip: If you cant avoid driving overkerbs and similar obstacles,then they should only be driven over at an obtuse angle and at

an appropriately slow speed.



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Impact break

Damage seen from the outside

Damage seen from inside the tire


C


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Exception: Sidewall indentation


Sidewall indentation

Body PlyOverlap

Ti d C d id


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Puncture to an external object, example: screw


Screw puncture

Ti d C d id


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Tire has been damaged by coming into contact with

the vehicle bodywork.

Ti d C d id


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Improper tire repair

Important: Continental advises, that a repair to one of its tires invalidates the manufacturerswarranty.

Ti d C d id


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Improper tire repair (tube repair patch)

Important: Continental advises, that a repair to one of its tires invalidates the manufacturerswarranty.

Ti d C d id


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Broken bead core

Broken bead as a result of being over tensioned during inflationImportant: Maximum seating pressure of 3,3 bar must not be exceeded.

Rim must be in good condition and sufficient tire bead lubricant applied

Ti d g C d id


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Mounting damage

Bead damage, due to improper mounting.Important: Both beads and rim shoulders must be sufficiently lubricated.

The tire fitting equipment must be suitable for the tires being fitted and in good condition.

Tire damages Causes and avoidance


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Wear

Wear is unavoidable

but subject to influence

Slip between the tire and the road surface causes wear and reduces mileage.

To reduce slip, drive smoothly.

Tip: Avoid unnecessary harsh cornering, braking and acceleration.

Slip causes wear.Aggressive driving increasesthe degree of slip.



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Uneven wear

Impact of the axle geometry on tire wear

One-sided wear caused by incorrect axle geometry



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Wear picture

Uneven wear caused by incorrect toe settings

Feather- edged wear

Important: Check the condition of your tires regularly. If irregular wear is detected, the vehicleaxle geometry should be checked as soon as possible

Incorrect toe settings lead tovery high sideforces and slip.

Wear caused by wrong toe settingscan be recognized by the

feathering of the block or rib edges



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Uneven wear

Saw-tooth or heel and toe wear

Saw-tooth wear pattern viewed from the side of the tire

Important: Reduce heel and toe wear by maintaining the correct tire inflation pressures and

avoid unnecessary harsh cornering.Note: A certain amount of heel and toe wear on the shoulder blocks is normal and not a causefor concern

tire damages causes & avoidance dec09

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