Tire Knowledge

Do you know about optimal air pressure ? Optimal air pressure varies according to each car. Please check the sticker attached near the door on the driver's seat side for details regarding air pressure Tyre air pressure decreases naturally by 10-20 kPa every month. Regularly check your tyres to maintain optimal air pressure *Source : JATMA, 2008 Too high or too low air pressure causes problems! Approximately two in every five vehicles are runing on poorly maintained tyres and the tyre air pressure of approximately 80% of these vehicles is improper. Poor maintenance rate in 1999 Poor maintenance rate in 2009 Other 4% Running over nails, foreign objects 1% External damage 1% Uneven tyre wear 8% Insuffcient tread depth 4% *Source : JATMA, 2009 When tyre air pressure decreases... Fuel consumption gets worse! Rolling resistance increase and leads to a decrease in fuel economy due to energy loss. Tyre are more likely to wear unevenly ! Too low pressure usually causes uneven tyre wear on the outer edge of the tyre tread whereas too high air pressure is more likely to causes uneven wear on the center of the tread Driving performance declines! Tyre deformation is more likely to occur, compromising stability . Additionally, even if it's a high-performance tyre, driving performance cannot be maintained, thereby affecting safety. We recommend replacing the tubeless valve stem when replacing tyres. When tyre valves deteriorate, it is more likely to cause air leakage. Since tubeless values are made of the same rubber material as tyres, they deteriorate over time due to heat and other factors. Loosening of value attachment part Rubber degrades due to loosening or vibration Air leak from degraded part Degradation of valve core rubber damage, foreign particles, etc.om rubber part Nitrogen gas is recommended for tyres since it is less likely to escape from a tyre compared with compressed air

Have you checked your tread depth ? Let's check for indications of tread wear *Circled areas are marked in color for explanatory purposes. An indication of tread wear is when the tread depth drops to approximately 1.6 mm. When the tread is worn down...   The brakes are likely to become less effective on wet roads! When the tread depth drops below roughly 50% of new tyres, the brake performance of tyres on wet road will gradually decline and the braking distance increase significantly.   Driving at high speeds in the rain is particularly dangerous! When the tread depth decreases, drainage capability declines and it is more likely to causes slippage in rainy weather.Hydroplaning tends to occur and diminish streering and brake effectiveness espercially when driving at high speeds. Using a tyre with indications of tread wear is prohibited as stipulated by laws and regulations. (New Tyre) (50% wear) ( 80% wear) *Tyre with a tread depth of 1.6 mm or less are not allowed to br used as stipulated by laws and regulations

 

Do you have uneven tyre wear ? Uneven tyre wear reduces the useful life of tyres. Centre wear Wear at the centre of the tread caused by too high air pressure Shoulder wear Wear on the outer edges or shoulders caused by insufficient air pressure Camber wear Heavy vehicles such as minivans are more likely to causes tyre wear on one side. Normally, front tyres wear out quickly when tyres are not rotated. Tyre rotation is recommended on a regular basis (roughly every 5,000 km). Benefits of tyre rotation    Prevention of uneven tyre wear Extension of useful life of tyres Consistent level of tyre wear *Front tyres of FWD vehicles wear out more quickly than rear tyres since front tyres serve both as driving and steering wheels. General method of rotation FWD vehicles RWD vehicles Directional pattern Including spare tyre Early adjustment is recommended when tyre wear is caused by misalignment. Early tyre replacement is recommended when tyres are reaching advanced stages of wear.

 

 

Do you have damage or cracks on your tyres ? These can cause problems such as a flat tyre. Side Cut (general exterior damage) Scratching (friction between tyre and car body, etc.) Checking (ozone crack) Tread tear (groove crack) Coming into contact with the curb or other obstacles on the road Foreign objects such as rocks lodged in the tyre.    Excessive bending and stretching due to insufficient air pressure, etc. Concentration of stress on certain parts due to damage, etc. Degradatio caused by UV rays, heat, etc. Overload and other causes due to runing on curbs, etc. Early tyre replacement it is recommended since damage or checking can cause problems.

 

Are surface irregularities on the side of you tyres normal ? * Bulge on the sidewall of a tyre * Dent on the sidewall of a tyre When a certain area of the tyre sidewall is partially protruding, a cord may have broken internally due to external causes such as shock, and is therefore dangerous. Replace the tyre immediately    There are cases in which a dent occurs and extends toward the sidewall area of a tyre. Such dents occur due to the internal structure and have no effects in terms of safety. This is not a sign of a defective tyre