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Other considerations

What else do I need to consider when buying tyres?

 

Buying new tyres for your car can be a confusing process, given how many options and specifications there are to consider. Whether you are looking for improved safety, performance or appearance, there are certain things you should think about. Here are some further points to help guide you as you select new tyres for your vehicle:

Up-sizing

Up-sizing your tyres means installing lower-aspect-ratio tyres on wider and larger-diameter wheel rims. Doing so allows vehicle drivers to customise the look and performance of the wheels of their car. Consider the following aspects when buying wide, up-sized tyres:

1. Load Capacity – the weight of the load the vehicle can safely carry as well as the maximum tyre pressure related to that weight. Must be equal to, or greater than, the Original Equipment tyre fitment.

2. Inflation Pressure – the amount of air in the tyre and the pressure on the rubber. Never lower than the Original Equipment manufacturer’s recommendations. Maintain pressure relationship between front and rear axle tyres. See below for more detailed information: e.g., if replacing Standard Load tyres with Extra Load (Reinforced) tyres.s.

3. Speed Rating – a rating from A to Z found on the sidewall that tells you the maximum speed a car can maintain for 10 minutes. Must be equal to, or greater than, the Original Equipment tyre fitment.

4. Rolling Circumference – the distance a wheel travels in one revolution. The Original Equipment rolling circumference should be maintained as closely as possible.

5. Tyre and Rim Combination – the correct rim size for the wheel. Only use industry approved tyre size and rim width combinations.

6. Body and Chassis Clearance – the minimum distance between the lower part of the vehicle and the road. Ensure sufficient body and chassis clearance under all service conditions.

Consult an expert, such as a tyre manufacturer or reputable dealer, when considering the change from narrow to wide tyres. Not considering these factors can negatively impact the performance of your car: the balance of the tyres, the vibrations in the car, the wear on the tyres, the car’s braking ability, the tread of the wheels, the traction with the road, the amount of wobble, the likelihood of aquaplaning, suspension effectiveness and fuel economy.


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Tyre Valves and Balancing your tyres

Snap-in tyre valves must be replaced every time a tyre is replaced. Always fit appropriate valve caps to avoid contamination of the valve core and subsequent air and pressure loss.

Do not attach any additional weight to the valve mouth or valve cap. In the case of valves with a sealing grommet, the grommet must be replaced every time a tyre is replaced. Always make sure that the valve body is appropriately torqued (follow the valve manufacturer’s recommendations for torque value) and that the grommet is compressed.


Valves for passenger car tyres and rims

If you drive your car at speeds above 210 km/h, use either metal (clamp-in) valves or valve supports to limit the valve deflection to a maximum angle of 25°. Using plastic can lead to problems in your wheels, especially at high speeds. 


Tyre and wheel balancing

When you turn the steering wheel and feel the car pull in a strange direction, it may be time to check that your wheels are balanced correctly. Wheels that are not balanced or are out of balance can vibrate, causing uncomfortable driving. This can result in premature wear of:

  • suspension
  • steering components
  • rotating parts
  • tyre tread

When refitting any tyre to the wheels of your car, we recommend undertaking wheel balancing to ensure that the tyres are correctly aligned. Doing so can help you avoid excess vibration and premature wear, which can be caused by an imbalance in the rotating wheel and tyre assembly.

As you consider which tyres to fit your car with, keep in mind characteristics like width, weight, valves and wheel balancing. With proper care, you should be able to choose the best wheels for your car, to ensure optimal levels of grip, vibration, balance and braking. These are the factors that make comfort, as well as safety, a priority.

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