KUMHO TIRE AS POLICY
1. KUMHO A/S Strategy
1. KUMHO A/S Strategy
Customer Satisfaction
Total Service
KUMHO TIRE
C/M OE Biz.
Kumho Dealer
Biz. Contract
OE A/S Network
Real-time response
Customer Complaint
2. Warranty Coverage
2. Warranty Coverage
Kumho Tires are warranted against defects in materials or workmanship
in normal use on the vehicle for the life of the original usable tread.
The life of original usable tread shall be ended when the 1.6mm (2/32nds
of an inch) of tread remain.
◈ Non adjustable condition
- Road hazards such as punctures, cuts, scuffs or impact breaks.
- Improper inflation, overloading, improper mounting or demounting.
- Run flat, irregular wear due to misalignment.
- Tire worn beyond treadwear indicator.
- Ride disturbance caused by misalignment, damaged wheel or
wheel imbalance.
3. KUMHO Compensation Policy
3. KUMHO Compensation Policy
A. Free Replacement
If a KUMHO tire fails as a result of workmanship or material defect
during the first 25% wear rate compared to original tread depth for
passenger radial tire, and the first 10% wear rate compared to original
tread depth for the other tires, free replacement will be applied.
3. KUMHO Compensation Policy
B. Pro-rated Replacement
If a KUMHO tire fails as a result of workmanship or material defect
over 25% wear rate compared to the original usable tread depth for
passenger radial tire and the first 10% wear rate compared to original
tread depth for the other tires, pro-rated replacement will be applied.
Namely, the claim adjustment will be done in proportion of the
remaining usable tread depth.
(R.T.D.-T.W.I.)
Compensation amount = P x
x (1 + rate of tax & expenses)
(O.T.D.-T.W.I.)
3. KUMHO Compensation Policy
C. Ride Complaint
If KUMHO tire fails due to the out of balance tire, the out of round tire
within 10% wear rate of the original casing life, free replacement will
be applied.
Whereas, KUMHO can not guarantee the claim tire which is the out
of balance tire, the out of round tire over 10% wear rate of the original
casing life.
CLAIM TIRE INSPECTION
CONTENTS
1.Tire Inspection Procedure
2.Tire Claim : Problem Conditions & Causes
- PC & LT Tires
- TB & Others Claim
1.Tire Inspection Procedure
A. Confirm the brand name : KH, MS, RC
B. Check the tire Size / Pattern / Ply Rating
C. Check the DOT No. or Serial No.(for TB)
D. Measure the Remaining Tread Depth(RTD)
E. Check the tire condition (Tread wear condition, Any
damage or evidence for repairing, etc.)
: Tread -> Sidewall -> Bead -> Inside
F. Inspect the damaged parts.
G. Explain the condition & the cause of damage to the
customer.
1.Tire Inspection Procedure- Measuring the R.T.D.
A. Measuring Method
①The most worn out point
R.T.D.(mm) =
①+ ②+ ③ / 3
②
③
1.Tire Inspection Procedure - Measuring the R.T.D.
B. Where to Measure
1.Tire Inspection Procedure - Measuring the R.T.D.
B. Where to Measure
1.Tire Inspection Procedure - Measuring the R.T.D.
B. Where to Measure
2.Tire Claim : Problem Conditions & Causes
A. PC & LT Tires
B. TB & Others Claim
- Bead Area
- Sidewall Area
- Tread Area
- Others
PC & LT Tires- Sidewall Indentation
Appearance
Photos
An indentation on the sidewall of a radial tire
Sidewall Indentation
Probable Causes
- Originated by the joint overlap of cord sheet during
the manufacturing process.
- It cause the difference of the expansion between
the section of overlapping and non overlapping.
Preventions
- The indentation is a common characteristic of radial
tires and will not affect the performance or the
safety of the tire. So,try to explain to the customer.
PC & LT Tires - Cord Break Up (CBU)
Appearance
Photos
A bulge on the sidewall of a radial tire
Cord Break Up (CBU)
※ Probable Causes
- Sidewalk
Cord Break Up (CBU)
※ Probable Causes
- A puddle or hole on the road
Cord Break Up (CBU)
※ Appearance of damage
1. In a short time, we can find a bulge
in the part which got impact
2. Also, most of cases, we can find
the mark of cord breakage in the
inside of the part
Cord Break Up (CBU)
Probable Causes
- The breakage of the body ply cords due to impact
from the outside.(sidewalk / puddle / hole etc.)
Preventions
- Maintain proper air pressure
- Avoid high-speed driving.
- When a vehicle pass the obstacles,reduce the speed.
PC & LT Tires- Spread/Missed Cord (Bulge)
Appearance
Photos
Radial, pencil shaped bulge on the sidewall of a
radial tire
Cord
Cord Missing
Spread/Missed Cord (Bulge)
Probable Causes
- Wider than normal carcass wire spacing.
- Improper joint splicing during manufacturing process
Preventions
- Consult with Kumho Eng’r
Spread/Missed Cord (Bulge)
◈ The difference of Bulge and Cord Break-up
Outside
(sidewall/Rim)
Inside
Bulge
Cord Break up
Both side
One side
No-mark
Mark of the tire
sidewall damage
No-mark
Mark of the rim
damage
No-mark
Mark of the cords
break
PC & LT Tires- Flat Spot
Appearance
Photos
Localized flat aspect on the tire tread area
which was contacted on the ground
Flat Spot
Probable Causes
- Shipping or storaging condition for a long time.
- Aggravated by low inflation pressure.
- Park the vehicle for a long time without changing
the position.
Preventions
- Avoid to park the vehicle for a long time.
- Maintain high pressure for storage the vehicles.
- Change the contacted position regularly.
PC & LT Tires - Belt Separation
Appearance
Photos
A bulge or split through the upper shoulder &
tread area
Belt Separation
Probable Causes
- Loose or separated steel wires due to low air pressure
and/or high speed driving.
- Adhesion loss within the tire at the edge of the belt.
- May be associated with a penetration or other damage.
Preventions
- Maintain proper inflation pressure.
- Avoid overloading and overspeed driving.
- Consult with Kumho engineer.
PC & LT Tires- Tread&Shoulder Separation(Bias)
Appearance
Photos
A bulge or split through the tread and
shoulder area of a bias tire
Tread & Shoulder Separation(Bias Tire)
Probable Causes
- It is mainly due to underinflation.
- The cause is overheating of the tire due to underinflation,
which weakens the adhesive between the cord and the
rubber layer.
Preventions
- Maintain proper air pressure and avoid overloading.
- Avoid overspeed driving and sharp cornering.
PC & LT Tires- Ply Turn-up Separation
Appearance
Photos
Circum cracks above the rim line area with
cord exposed
Ply Turn-up Separation
Probable Causes
- Improper bead seating,improper rim size,overloaded
or underinflated condition or possible manufacturing
condition.
Preventions
- Ensure proper rim size
- Maintain proper air pressure and avoid overloading.
PC & LT Tires –Torn Beads
Appearance
Photos
Bead toe rubber is torn or cut
Torn Beads
Probable Causes
- Poor mounting/demounting techniques with tire tools
and/or lubrication, forklift damage and poor tire handling
procedures
Preventions
- Review mounting/demounting procedures and tire tools.
- Ensure the tire beads are well lubricated.
- Also check new tire handling procedures.
PC & LT Tires –Distorted Bead
Appearance
Photos
Local areas of distortion in the bead
Distorted Bead
Probable Causes
- Improper use of tools, or incorrect techniques used
when mounting the tire.
- Improper or defective rim(bent or rusty rims)
- Shipping/handling damage.
Preventions
- Review mounting/demounting procedures and tire tools.
- Use proper rim and ensure the tire beads are lubricated.
- Also check new tire handling procedures.
TB Tires – Bead Area - Bead Deform & Burst
Appearance
Photos
Circumferencial deformation and/or burst of
the bead area
Bead Area - Bead Deformation & Burst
Probable Causes
- Rusty rims, improper bead lubrication, and bent or damaged
rims which result in improper bead seating.
- Excessive heat in the bead area.
Preventions
- Review mounting/demounting procedures and the use of
tire tools
- Ensure the tire’s beads are well lubricated.
TB Tires – Bead Area-Turn-up & Chafer Sepa.
Appearance
Photos
Circumferencial cracks above the rim line area
with cords exposed
Bead Area- Turn-up & Chafer Separation
Probable Causes
- Improper bead seating,improper rim size,overloaded or
underinflated condition, impact or possible manufacturing
condition.
Preventions
- Ensure proper rim size, mounting procedures, loading
condition and inflation pressures are utilized.
TB Tires – Bead Area- Flow Crack
Appearance
Photos
Circum cracks above the rim line area without
cord exposed
Crack
Bead Area - Flow Crack
Probable Causes
- Improper rubber flow during the manufacturing process.
- Aggravated by overloaded or underinflated condition.
Preventions
- Ensure proper inflation pressure and loading condition.
- Consult with Kumho Engineer
TB Tires – Side Area - Carcass Separation
Appearance
Photos
Separation between belt & carcass cords in
tire shoulder area
Side Area - Carcass Separation
Probable Causes
Loss of adhesion between belt and carcass ply from excessive
heat and stress generated by improper inflation pressure,
overloading, excessive high speed and friction from sudden
starting, cornering and braking
Preventions
- Maintain proper inflation pressure.
- Avoid overloading and overspeed driving.
- Avoid sudden starting,cornering and braking.
TB Tires – Side Area - Vehicle Damage
Appearance
Photos
Uniform scuffing or cutting on some part of
the tire outside surface
Side Area - Vehicle Damage
Probable Causes
- Contact with vehicle hardwares.
- Can also be caused by objects trapped between dual tires.
Preventions
- Analyze the cause of the condition and correct it.
TB Tires – Side Area - Weather Cracking
Appearance
Photos
Numerous small cracks in the rubber surface
Side Area - Weather Cracking
Probable Causes
- Rubber surface exposure to ozone.
- Aggravated by long periods of parking and/or sea side area.
Preventions
- Minimize parked vehicle time.
TB Tires – Side Area - Folklift Damage
Appearance
Photos
Cut similar to impact damage on a brand
new tire
Side Area - Folklift Damage
Probable Causes
- Caused during handling procedures by folklift.
Preventions
- Inspect tire upon receipt.
TB Tires – Side Fatigue Rupture(Zipper crack)
Appearance
Photos
A circum break in the mid to upper sidewall
exposing an even line of broken cords
Side Area - Side Fatigue Rupture(Zipper crack)
Probable Causes
Severe underinflation or overloading condition which
produces casing cord fatigue, often a result of a puncture.
Preventions
- Routinely inspect all tires with inflation pressures.
- Avoid overloading.
TB Tires – Side Area - Radial Split
Appearance
Photos
A vertical break through the sidewall occuring
between two body ply cables, that does not break
Side Area - Radial Split
Probable Causes
- Severe impact.
- It can occur in overinflated and/or overloaded condition.
Preventions
- Maintain proper inflation pressure and loading.
- Review driver training.
TB Tires – Side Area- Open Sidewall Splice
Appearance
Photos
Regular smooth opening of the sidewall
rubber (No cords are exposed)
Side Area - Open Sidewall Splice
Probable Causes
-Loss of adhesion in sidewall splice due to
manufacturing process.
Preventions
-Consult with Kumho Eng’r.
TB Tires – Tread Area - Belt Separation - I
Appearance
Photos
Belt wire protruding through the exterior or
interior surface of the tire
TB Tires – Tread Area - Belt Separation-II
Appearance
Photos
A bulge or split through the upper shoulder &
tread area
Tread Area - Belt Separation
Probable Causes
- Loose or separated steel wires due to low air pressure
and/or high speed driving.
- Adhesion loss within the tire at the edge of the belt.
- May be associated with a penetration or other damage.
Preventions
- Maintain proper inflation pressure.
- Avoid overloading and overspeed driving.
- Consult with Kumho engineer.
TB Tires – Tread Area - Chipping/Chunking
Appearance
Photos
Rough, abraded tread surface with numerous
small flakes or chunks of tread removed
Tread Area - Chipping / Chunking Tread
Probable Causes
- Misapplication of the tire to service conditions.
- Caused by excessive loading on bad roads.
- Aggravated by overinflation and short turns, especially on
drive axle tires.
Preventions
- Review tire selection.
- Avoid overloading
- Use traction type of tires in drive axle.
TB Tires – Separation Due To Stone Drilling
Appearance
Photos
Damage Causesd by stones trapped in the tread
which penetrate the tread extend into the belts
Tread Area - Separation Due To Stone Drilling
Probable Causes
Tread design and/or misapplication of the tire to service
conditions (gravel roads/Quarry operation)
Preventions
- Remove remaining stones from the tread frequently.
- Review tire selection.
- Avoid overloading condition.
TB Tires – Tread Area - Rib Tearing
Appearance
Photos
Tear at the base of the main tread grooves,
generally at the shoulder area
Tread Area - Rib Tearing
Probable Causes
- Caused by running over curbs and rails, or by severe
localized impacts.
- Aggravated by overloading, hot tires and sharp turning.
Preventions
- Review driving procedures.
- Avoid overloading condition, high speed driving and sharp
cornering.
TB Tires – Tread Area - Heel & Toe Wear
Appearance
Photos
Each lug around tire worn high to low from
front to back edge
Tread Area - Heel & Toe Wear
Probable Causes
- Untimely rotation of tires.
- Under-inflation and/or overloading condition.
- Caused by mismatched inflation pressures or tire diameter
in a dual assembly and certain conditions such as
mountainous terrains, etc.
Preventions
- Rotate tires regularly.
- Maintain proper air pressure and avoid overloading.
- Correct defective suspension.
Others - Run Flat (TB-R)
Appearance
Photos
Advanced deterioration of the tire affecting
360⁰ of tire sidewall & inner liner
Others - Run Flat(PC/LR-R & Bias)
Appearance
Photos
Advanced deterioration of the tire affecting
360⁰ of tire sidewall & innerliner
Run Flat
Probable Causes
- Rapid loss of inflation pressure
- Continue to run after puncture.
- Running under extremely low inflation pressure.
Preventions
- Maintain proper inflation pressure.
- Check the necessary things that related to air leakage.
(rim,valve & cap, tube and flap etc.)
Others – Impact/Cut Damage
Appearance
Photos
Localized break through the tire rubber and
the casing by impact or cut
Others – Impact/Cut Damage
Appearance
Photos
Localized break through the tire rubber and
the casing by impact or cut
Others – Impact/Cut Damage
Appearance
Photos
Localized break through the tire rubber and
the casing by impact or cut
Impact/Cut Damage
Probable Causes
- Severe, concentrated impact with a foreign object or a
chuck hole.
- Aggravated by over-inflation and high speed.
Preventions
- Maintain proper inflation pressure.
- Avoid overloading and over-speed driving.
Others - Penetration/Repair Related Bulge
Appearance
Photos
An excessive or slight bulge in the sidewall
associated with a repair or penetration
Penetration/Repair Related Bulge
Probable Causes
- Cord breakage due to penetration,impact, or cut.
- A tire with a repair may show this condition soon after
being repaired.
Preventions
Others - Penetration
Appearance
Photos
Evidence of a puncture or damage by foreign
object through the tread or side area
Others - Penetration
Appearance
Photos
Evidence of a puncture or damage by foreign
object through the tread or side area
Others - Repaired Tire
Appearance
Photos
Repaired on the interior or exterior area of
the tire