If being considered, up-sizing is an option which allows vehicle owners to customise their vehicle, by installing lower aspect ratio tyres on wider and larger diameter rims. The following are important tyre related aspects that need to be considered in every plus-sizing application:
1. Load Capacity – must be equal to or greater than Original Equipment tyre fitment.
2. Inflation Pressure – never use a tyre inflation pressure lower than the Original Equipment manufacturer’s recommendations. Maintain pressure relationship between the front and rear axle tyres. See below for more detailed information, for example if replacing Standard Load tyres with Extra Load (Reinforced) tyres.
3. Speed Rating – must be equal to or greater than Original Equipment tyre fitment.
4. Rolling Circumference – the Original Equipment rolling circumference should be maintained as closely as possible.
5. Tyre and Rim combination – only use industry approved tyre 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 tyre expert (tyre manufacture or reputable tyre dealer)
Snap-in 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 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 tyre 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 tyres.
When refitting any tyre to a wheel a we recommend that the tyre is correctly rebalanced to help to eliminate vibration and avoid premature wear caused by an imbalance in the rotating wheel and tyre assembly.
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°.