Tire Maintenance Manual

  • Tire Test Checklist
  • How to replace a tire

    • Like the car body, tires can be used for a long time only if they are managed properly. Ensure safety while also extending the lifespan of your tires through the ‘Tire Test Checklist’.

      1. Is the air pressure proper?

      Tire Pressure

      If a tire is used without having sufficient air pressure, much heat is generated from the tire. Thus, it causes separation of the rubber and code besides the code disconnection and tire rupture. Also, the edge of the tires is worn-out easily shortening the life of the tires. Meanwhile if a tire is used having excessive air pressure, the tire is always under a state of tension. For this reason, the tire may be ruptured and cut easily in case of having an external impact. Also, a vehicle tends to skid when pressing the break and the middle part of the tire is worn out fast shortening the life of a tire.

      2. Are there any tires that are abnormally worn-out (Partial abrasion)?

      Partial abrasion

      To prevent an abnormal abrasion, the air-pressure and wheel alignment should be checked regularly and the tire position should be replaced after driving 8,000~10,000km for even abrasion of the tires (The tire replacement may be adjusted depending on the worn-out condition).

      3. Are there any tires below than Treadwear Index (TI) (Depth of the left dent: 1.6mm)?

      Treadwear

      If a tire below Treadwear Index (TI) is used, a vehicle is easily skidded as the breaking distance becomes longer. Also, it tends to be ruptured when an alien substance is pierced and generate hydroplaning causing difficulty in breaking and handling operation.

      4. Are there any damages?

      Tire Damage

      If a tire is operated having an alien substance, such as a nail or stone, inside the tread dent, the tire may be punctured or rupture. Presence of tire damage shall be checked in the tire store and any damaged tires must be replaced to a new one in case when the damage threatens the safety of carcass.

      5. Is there any abnormality on the spare tires?

      Spare Tire

      For a spare tire, the air pressure, presence of damage, and abrasion state must be checked in regular base for its instant use when needed. Any old tires mustn’t be used.

      6. Are the wheels balanced well?

      Balanced Tire

      The poor wheel balance causes difficulty in driving as the handle shakes and discomfort while driving. Also, it generates partial abrasion and severe noise.

      7. Is there any damages on the wheels?

      Damage Wheels

      The damaged wheel is the cause of an accident as the air-pressure is released. It also causes rupture of a tire by the irregular load distribution. Meanwhile, the heat generated by the friction at the rim and bead part of a tire damages the code.

    • It is advised to change the position of the replaced and installed tires in regular base depending on the worm-out state. By doing so, the life of tires can be extended as all four tires are evenly worm out. The period of the tire repositioning is approximately every 10,000km of driving as suggested by the automobile companies.

      Replace Tire

      How to replace a tire?

      It is advised to change the position of the replaced and installed tires in regular base depending on the worn-out state. By doing so, the life of tires can be extended as all four tires are evenly worn out. The period of the tire repositioning is approximately every 10,000km of driving as suggested by the automobile companies.

      Replace Tire

      Things to note when replace a tire

      1. Check-up list before installing and removing a tire


      • Required tools must be used for the installation/removal of a tire and wheel and such process must be conducted by an expert specialized in tire installation/removal.
      • Presence of any damages on the tire and wheel must be checked before installing a tire.
      • Any damaged tire or wheel mustn’t be used.
      • Only the tire and wheel that are qualified in the standard must be used for their assembly.

      2. Things to note when installing and removing a tire


      • The presence of air leakage around the valve must be checked.
      • When replacing a tire, the valve must be always replaced.
      • In case of a tire that is used along with a tube, that tube must be replaced as well when replacing the tire.
      • When pumping air into a tire, the safety screen or safety equipment must be use.
      • When pumping air into a tire, the position of the tire to the rim must be clearly checked and then air should be pumped after the properly securing the position of the tire.
      • When pumping air into a tire, the air pressure more than the amount indicated in the manual or plan card of the vehicle.

      In case of the failure to follow the above mentioned safety guideline, a tire and wheel may spring up owing to the damage on the tire or wheel causing a life-threatening damage.

      Things to be know

      1. The drivers are recommended to read the tire related instructions provided by the automobile companies.

      2. The air-pressure and load must be observed as recommended in the automobile companies.


      • The air-pressure of a tire should be checked at least once a month including the spare tire.
      • When driving an expressway, it is advised to take a break more than 15 minutes once in every 2 hours.
      • Never drive when the air-pressure of a tire is low or high.
      • Do not drive under the over-loaded condition.

      3. When selecting a tire, the vehicle to be use and using condition should be considered.

      4. The air-pressure, worn-out state, and presence of external damage or stuck nail must be checked from a tire.

      5. A tire shouldn’t be used if it has external damage and it should be checked.

      6. It is advised to drive slowly when passing on the curb stone or obstacles and hollow area on the road because the inner code of the tires may be disconnected causing the tire rupture.

      7. Time of a tire replacement


      • Required tools must be used for the installation/removal of a tire and wheel and such process must be conducted by an expert specialized in tire installation/removal.
      • Presence of any damages on the tire and wheel must be checked before installing a tire.
      • In case of a tire that is used along with a tube, that tube must be replaced as well when replacing the tire.
      • Any damaged tire or wheel mustn’t be used.
      • Only the tire and wheel that are qualified in the standard must be used for their assembly.

      In case of the failure to follow the above mentioned safety guideline, a serious damage may occur to the tire; thus, it may cause a serious physical injury or life threatening incidence owing to the tire rupture while driving.