tire damages causes & avoidance dec09
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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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Influence of inflation pressure
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
Influence of inflation pressure
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Influence of inflation pressure
Heat service camera
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Influence of inflation pressure
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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
Influence of inflation pressure
Inflation pressure 2,4 bar
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121.4
105.7
outside
*>140.0F
* 60 C
Inflation pressure 1,8 bar
Influence of inflation pressure
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121.4
105.7
outside
*>140.0F
* 60 C
Inflation pressure 1,3 bar
130.5
116.1
*>140.0F
* 60 C
55C
46C
60 C
55 C
50 C
45 C
40 C
35 C
30 C
Influence of inflation pressure
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121.4
105.7
outside
*>140.0F
* 60 C
Inflation pressure 0,75 bar
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
Influence of inflation pressure
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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)
Influence of inflation pressure
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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
Influence of inflation pressure
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How to recognize tires driven with low inflation pressure
Influence of 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
Influence of inflation pressure
Double sided shoulder wear
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Possible consequences of driving with low inflation pressure
Influence of inflation pressure
Uneven wear may indicate belt separation.
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Possible consequences of driving with low inflation pressure
Influence of inflation pressure
Parts of the tire have
separated as
a result of poor pressuremaintenance.
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Possible consequences of driving with low inflation pressure
Influence of inflation pressure
Tire destroyed by driving withtoo low inflation pressure
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Possible consequences of driving with low inflation pressure
Influence of inflation pressure
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Damage due to external factors
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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.
Damage due to external factors
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Impact break
Damage seen from the outside
Damage seen from inside the tire
Damage due to external influences
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Exception: Sidewall indentation
Damage due to external influences
Sidewall indentation
Body PlyOverlap
Ti d C d id
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Puncture to an external object, example: screw
Damage due to external influences
Screw puncture
Ti d C d id
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Damage due to external influences
Tire has been damaged by coming into contact with
the vehicle bodywork.
Ti d C d id
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Damage due to external factors
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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Damage due to external factors
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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Damage due to external factors
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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Damage due to external influences
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
Tire damages: Causes and avoidance
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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
Tire damages: Causes and avoidance
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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