Tyre User Guide
TO AVOID DANGER
Inflating the tyres
- To avoid the danger from tyre busting, keep appropriate distance from the tyre when inflating it; keep the tyre in a safety cage.
- While assembling a passenger car tyre, maximum air pressure for the bead seating is 300kPa (3.0kgf/cma); do not inflate the air over this pressure.
- Inflate the tyre to less than the bead seating pressure and after ascertaining that the both sides of the beads are mounted evenly on the flange of the rim, adjust the inflation to the recommended level.
- For T-type tyres, collapsible spare tyres, run flat tyres or other types of tyre specified by the manufacturer's instructions.
Do not use tyres that have cuts or cracks which reach the cords inside. The use of such tyres could lead to accidents. Consult with your tyre dealer to see whether repair is possible.
MAINTAINING SAFETY AND PERFORMANCE
Choice of tyres
- Basically, the standard tyres or optional tyres specified by the vehicle manufacturer should be used. When choosing other tyres, consult your dealer.
- Use the same tyre in type, structure and size to all wheels. In case where the manufacturer specifies tyres of different sizes for each axle, follow the manufacturer's instruction.
- Do not use tyres of different type, structure or size on the same axle; differences in tyre performance could lead to accidents. (The T-type spare tyre is an exception for this).
- Use tubes or flaps marked with the same size as the tyre. And use valves which are appropriate for the vehicle and wheel. With a new tyre, use a new tube and flap.
- Consult with the dealer when choosing a wheel to suit the tyre size. For a tubeless tyre, be sure to use a tubeless tyre wheel.
Checking for foreign objects or damage
- Check that the wheel is not cracked, deformed or markedly corroded.
- Check that there is no crack in the tyre and there is no nail, piece of metal, glass, etc...in the tyre. And make sure that there is no stone or other foreign object in the tread. If you find any foreign object, consult your tyre dealer to remove it.
Mounting the tyre / wheel
- In the case of tubeless tyre, air can leak out if there is any damage around the bead. Use Bridgestone-recommended lubricant when assembling the tyre on the wheel.
- Foreign objects or moisture inside the tyre could lower tyre performance. Before assembling the tyre to the wheel, check the inside the tyre and remove any foreign objects or moisture.
- Water from the compressor can also get inside the tyre. Drain the compressor off regularly.
- After the wheel assembly of a tubeless tyre, check that there is no leakage of air from the part between the tyre and the wheel hump or from the valve (Move the valve up and down and sideways to check).
- Be sure to adjust the wheel balance, in order to avoid vehicle vibration or uneven wear.
- Tyres which have side-protector should be fitted with the side-protector facing outside.
- If the tyre has rotation mark or instruction for assembling on its side-wall, please follow the information.
- When a tyre is fitted to a vehicle, make sure that the tyre does not touch the body of the vehicle to avoid rupturing.
- Make sure that the tyre/wheel does not project over from the body of the vehicle.
- It is not recommended to mount the wheel in such a way that it projects over from fender. It is also recommended not to modify the fender or remodel the body of the vehicle.
- As for dual fitment, a large difference in diameter between the two tyres can cause early damage or uneven wear and have an adverse effect in terms of safety and economy. For dual fitment on a light truck, check that the difference in diameter is 6mm or less for radial tyres and 8mm or less for bias tyres. In case of mounting tyres which have allowed difference in diameter, mount the smaller wheel on the inside.
- Tighten the nuts and bolts with specified torque.
- After inflating tyres to the correct pressure, check that there is no air leakage from the valve core, the rim or aound the valve before putting on the valve cap.
- Make sure to put on valve cap and tighten it appropriately.
- Check the air pressure regularly (once a month) using an air pressure gauge before moving the vehicle and when the tyre is cold. Adjust it to the pressure specified by the vehicle manufacturer or tyre manufacturer. Insufficient pressure can cause damage to tyre or lead to accidents.
- Insufficient inflation pressure, particularly in a low-profile tyre, is not visually noticeable; always use an air pressure gauge to check the tyre pressure.
- During and after driving, the air pressure is high because of the heat. Never try to reduce the pressure while the tyre is hot.
- The air pressure specified by the car manufacturer is indicated somewhere near the door of the vehicle. If you cannot find them, consult with your car dealer or tyre dealer.
- In order for the tyres to provide their best performance, it is important that they are used at the correct inflation pressure. Usage of the tyres at an inappropriate pressure will lower its performance and cause tyre damage.
- Check the inflation pressure of the spare tyre regularly (once a year) and adjust it to the value specified by the vehicle manufacturer or tyre manufacturer.
- As for dual fitment, large difference in inflation pressure can cause early damage or uneven wear and have an adverse effect in terms of safety and economy. Adjust the air pressure to the same level on both inside and outside tyre.
- The instructions of "Choice of tyres" and "Tyre pressure" should be followed, even in case of sporting activities such as circuit racing (on-road tyres) or rallying (trail tyres).
Limit of usage
- A tyre is at its limit of use when the wear indicator becomes exposed, indicating tread depth of 1.6mm. Replace the tyre with a new one before it reaches this stage. A worn tyre is dangerous; manoeuverability deteriorated and the tyre becomes more likely to slip on a wet road.
- While driving, of you feel that the steering is unstable, or notice any abnormal sound or vibration, stop the vehicle in a safe place as quickly as possible then inspect both the vehicle and the tyres. Check that there is no deformation or other abnormality in the tyres. And even if there is no visible abnormality, continue your journey as slow as possible and have the tyres inspected by a tyre dealer.
- Sudden starts, acceleration, turns and stops are all dangerous and should be avoided. On wet, snowy or frozen roads in particular, skidding is a potential danger that can lead to accidents. Drive in a manner suited to the road conditions.
- To avoid tyre damage, avoid driving over a curbstone, driving over sharp holes on the road surface. etc.
- When driving, always keep a distance from the vehicle in front suited to the traffic speed. On wet, snowy or frozen roads in particular, be sure to keep a safe distance from the vehicle in front.
- When the type and size of tyre is changed from the original tyre, be sure to drive with care untill you become accustomed to the new type's manoeuverability.
- To ensure safe driving, check that there is no crack in the valve core. If you find any crack, consult with your tyre dealer. Also make sure the valve cap is closed tightly.
- Follow the car manufacturer's instruction when T-type tyre is used or run flat tyre has puncture.
Beautification and protection
- If you use instant puncture repair agents or tyre shine agents, do not use any of them which have harmful effects on the tyre.
- When applying a tyre shine agent or rim assembly lubricant containing silicon or wax, take care not to get any substance on the surface of the tread (the part that grip the road). If any substance get on the tread, drive extra carefully.
- Wear of the tyre differs because of the position (drive axle or steering axle). To avoid abnormal noise or vibration, and to extend the tyre life, rotate the tyres with appropriate timing.
- Rotate the tyre regularly, including the spare tyre, in a proper manner suited to the conditions of the vehicle (except T-type spare tyre).
- Overloading is not only a cause of damage to the tyres and shortened tyre life but it can also lead to cracking the wheel. Avoid driving with the vehicle overloaded, also avoid unbalanced loading.
- If the wheels of a vehicle are out of alignment, it can cause poor manoeuverability and abnormal wear. Check and adjust the wheel alignment at appropriate timing.
- Branding should be applied superficially near the rim line in order to avoid cracking from the branding area.
- Avoid using processed tyres as it can lead to accidents.