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Other considerations

Up-sizing

If being considered, up-sizing is an option which allows vehicle owners to customise their vehicle, by installing lower aspect ratio tires on wider and larger diameter rims. The following are important tire related aspects that need to be considered in every plus-sizing application:

1. Load Capacity – must be equal to or greater than Original Equipment tire fitment.

2. Inflation Pressure – never use a tire inflation pressure lower than the Original Equipment manufacturer’s recommendations. Maintain pressure relationship between the front and rear axle tires. See below for more detailed information, for example if replacing Standard Load tires with Extra Load (Reinforced) tires.

3. Speed Rating – must be equal to or greater than Original Equipment tire fitment.

4. Rolling Circumference – the Original Equipment rolling circumference should be maintained as closely as possible.

5. Tire and Rim combination – only use industry approved tire size and rim width combinations.

6. Body and Chassis Clearance - ensure sufficient Body and Chassis clearance under all service conditions.

It is always advisable to consult a tire expert (tire manufacture or reputable tire dealer)

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Tire Valves and Balancing your tires

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

Do not attach any addition weight to the valve mouth or valve cap and in the case of valves with sealing grommet, the grommet must be replaced every time a tire is replaced. Always make sure that the valve body is appropriately torqued (torque value: please follow the valve manufacturer‘s recommendations ) and the grommet is compressed. For 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°.

Wheels that are not balanced or are out of balance generally produce a vibration that is uncomfortable to drive in and results in premature wearing of suspension and steering components, rotating parts and tires.

When refitting any tire to a wheel a we recommend that the tire is correctly rebalanced to help to eliminate vibration and avoid premature wear caused by an imbalance in the rotating wheel and tire assembly. 


Valves for passenger car tires and rims

For 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°.

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