probable damage cause to tyres
TRANSCRIPT
PROBABLE CAUSES OF TYRE DAMAGE
Irregular tread wear – One shoulder
• Description:– Excessive wear on ONE shoulder
around the circumference of the tyre.
• Probable Causes:– Axle geometry
• Axles not parallel.• Incorrect wheel alignment.• Excessive toe-in or toe-out.
• Suggested Actions:– Check wheel and axle
alignment. – Check suspension system.
Irregular tread wear – Both shoulders
• Description:– Excessive wear on BOTH shoulders
around the circumference of the tyre.
• Probable Causes:– Incorrect tyre inflation pressure.
• Underinflation.
• Suggested Actions:– Look for reason of underinflation
(defective valve, accidental damage or puncture, defective repair, etc.).
– Check vehicle manufacturers recommended inflation pressures.
• Description:– Excessive wear in central tread
area around the circumference of the tyre. Characteristic of rear drive axle fitment.
• Probable Causes:– Incorrect tyre inflation pressure.
• Overinflation.
• Suggested Actions:– Check vehicle manufacturers
recommended inflation pressures.
Irregular tread wear - Centre
• Description:– Excessive wear in regular angular
phases or spots around the circumference.
• Probable Causes:– Axle geometry.– Mainly on non-driven rear axle.– Defective suspension system.
• Suggested Actions:– Check suspension system.– Check complete axle / vehicle
geometry.
Irregular tread wear - phased
Irregular tread wear – Localized
• Description:– Excessive wear in one isolated
localized spot
• Probable Causes:– Extreme braking causing wheel
lock.
Tread separation
• Description:– Separation of tread rubber from
carcass.
• Probable Causes:– Underinflation causing excessive
flexing and heat generation leading deterioration of rubber bonding.
– Overloading.– Incorrect application.– Accidental damage to tread area
resulting in water/dust penetration.
• Suggested Actions:– Remove tyre from service.– Check inflation pressures.– Check tyre size, load / speed
correspond to manufacturers specification.
Tread chipping/chunking
• Description:– Chipping and or chunking of
tread rubber.
• Probable Causes:– Excessive use on gravel / sharp
stone road.– Incorrect tyre application.– Incorrect inflation pressure,
overinflation.
• Suggested Actions:– Check inflation pressures.– Check tyre suitability for
application.
• Description:– Cutting or laceration of the tread
rubber.
• Probable Causes:– Accidental damage after contact
with sharp object on the road surface (eg. glass, stone, nail, metal, etc.).
• Suggested Actions:– Remove tyre from service and
have inspected by qualified tyre dealer to assess damage.
Accidental tread cuts
Accidental tread impact damage• Description:
– Disintegration of tyre structure.
• Probable Causes:– Violent impact with road obstacle (eg.
large rock, pot hole, etc.).
– High speed impact.– Over inflation.
• Suggested Actions:– Remove tyre from service.– Check inflation pressure corresponds
to vehicle manufacturers recommendation.
Sidewall impact damage (1)
• Description:– Convex bulge on sidewall / shoulder
area of the tyre due to broken carcass.
• Probable Causes:– Impact with obstacle on road surface
(eg. large rock, pot hole, etc.).
– Impact against kerb stone.
• Suggested Actions:– Remove tyre from service.– Check inflation pressure corresponds
to vehicle manufacturers recommendation.
INTERNAL VIEW
EXTERNAL VIEW
Sidewall impact damage (2)
• Description:– Convex bulge on sidewall /
shoulder area of the tyre due to broken carcass.
• Probable Causes:– Incorrect fitting / removal
procedure.
• Suggested Actions:– Remove tyre from service.
EXTERNAL VIEW
INTERNAL VIEW
Accidental sidewall damage (1)
• Description:– Clean cuts into sidewall rubber.
• Probable Causes:– Damages caused by impacts
against sharp foreign bodies or vehicle parts.
– Contact with “kerb” or foreign object on the road.
• Suggested Actions:– Remove tyre from service and
have inspected by qualified tyre dealer to assess damage.
– Check clearance from wheel arch and ensure free rolling without interference from vehicle parts.
Accidental sidewall damage (2)
• Description:– Radial cut / break-up in the
sidewall area.
• Probable Causes:– Violent impact against foreign
body.– Damaged rim.– Incorrect rim size.– Incorrect fitting procedure,tyre
not correctly “seated” on rim.
• Suggested Actions:– Remove tyre from service.– Check tyre suitable for rim.
Accidental upper sidewall damage
• Description:– Circumferential break-up in the
upper sidewall area.
• Probable Causes:– Overloading.– Under inflation.– Misapplication.– Stone trapping when in dual
fitment.– Incorrect dual spacing or
underinflation causing tyre “kissing”.
• Suggested Actions:– Remove tyre from service.– Check load/speed and inflation
pressures of remaining tyres.
Accidental lower sidewall damage• Description:
– Circumferential break-up in the lower sidewall area.
• Probable Causes:– Overloading.– Under inflation.– Misapplication.– Incorrect tyre for rim size.– Incorrect fitting procedure,tyre not
correctly “seated” on rim.
• Suggested Actions:– Remove tyre from service.– Check load/speed and inflation
pressures of remaining tyres.– Check tyre suitable for rim.
Accidental bead damage
• Description:– Circumferential cracking /
tearing of rubber in the bead area.
• Probable Causes:– Overloading.– Under inflation.– Fitted without lubrication– Incorrect tyre for rim size.– Incorrect fitting procedure, tyre
not correctly “seated” on rim.
• Suggested Actions:– Remove tyre from service.– Check load/speed and inflation
pressures of remaining tyres.– Check tyre suitable for rim.
Accidental run flat damage• Description:
– Circumferential abrasion / cracking of rubber on the sidewall and inside tyre due to running at insufficient pressure.
• Probable Causes:– Overloading / under inflation.– Slow air loss due to penetration of
foreign body or incorrect repair.– Incorrect fitting procedure, tyre not
correctly “seated” on rim.– Slow air loss from faulty valve core
(eg. dust in valve stem).
• Suggested Actions:– Remove tyre from service.– Check load/speed and inflation
pressures of remaining tyres.