Proper inflation is the single most important part of tyre care, tyre pressure is not determined by the type of tyre or its size but upon your vehicle’s load and driving application i.e. speed.
To find out what your car’s tyre pressure should be, consult the manufacturer’s tyre placard usually found inside the driver’s door sill, glove box, fuel filler cap or under the bonnet. The placard also displays the manufacturers recommended tyre sizes.
Tyre pressures should be checked when the tyre is ‘cold’, as pressure increases as the tyre becomes ‘hot’. Take the “cold” reading and check them against the recommended tyre pressures from your placard. Heavy loads or towing puts an extra strain on your tyres.
So if your vehicle is fully loaded with passengers and luggage, the general rule is to add 28kpa (4PSI or 4lbs).
At high speed, (defined as driving at 120km/h for over one hour), your tyres will wear out twice as fast as when you drive at 70-80 km/h.
If your tyres are under-inflated by twenty per cent tyre life can be reduced by thirty per cent. The rule here is to add 28Kpa (4PSI) from your Minimum Compliance Plate Pressure.
Don’t inflate your tyres above 40 psi or 280 kPa. When the tyres get hot from driving, the pressure will increase even more.
It is crucial to know when it is okay to have a tyre repaired and when a tyre should be replaced.
If a tyre loses its air pressure, it must be removed from the wheel for a complete internal inspection to be sure it is not damaged.
Tyres that are run even a short distance while flat are often damaged beyond repair. Most punctures, nail holes or cuts up to 6 millimetres can be repaired by trained technicians as long as the damage is confined to the tread.
DO NOT repair tyres with tread punctures larger than 6 millimetres, or any sidewall puncture. Also, never repair tyres which are worn below the wear indicator bars that are located on your tyre, as they wouldn’t conform to New Zealand Land Transport Vehicle Standards.
All tyre repairs should be handled by trained professionals. Your best bet is to keep a good spare tyre in your boot.
Be sure that the spare is inflated to the proper pressure and adheres to New Zealand Land Transport Vehicle Standards.
When any problems with your tyres occur, head to Simpsons Tyres and Autocare for expert service from our trained technicians.
The weight of a vehicle is not evenly distributed to all four car tyres.
Therefore, regular rotation is necessary to maintain even tread wear and get the most out of your tyres. There are several methods of rotation.
For all-season tyres and most vehicles on the road, tyres from the rear axle are moved to the drive axle and crossed to opposite sides of the vehicle.
The tyres from the front axle are moved to the rear, but remain on the same sides. This is known as the ‘modified X’ pattern.
For 4WD vehicles, it is recommended to switch all four tyres, both from side-to-side and in axle position. Check your owner’s manual for the manufacturer’s rotation recommendations. If no rotation period is specified, tyres should be adjusted every 10,000 km’s.
4WD tyres may require rotation as soon as every 4,000 km’s. The first rotation of your tyres is the most important, and be sure to remember to adjust inflation pressures to the vehicle manufacturer’s recommendations after every rotation.
Here at Simpsons Tyres and Autocare can schedule a rotation for your vehicle at any time.
When the shoulder of the tread on one side of a tyre wears faster than the adjacent tread surface, this can result from a variety of conditions, such as front and/or rear misalignment (example, toe or camber), lose or worn suspension components, hard cornering, improper tyre rotation practices, misapplication, high crown roads or non-uniform mounting.