4x4 tyre conversions
Where there is a change in a 4x4 vehicle’s use, or a different performance or look is required, a tyre conversion may be considered.
This may involve just a change of tyre type to something more suited to the vehicle’s use, or a complete wheel / tyre package.
A few recommendations from BFGoodrich before carrying out a tyre conversion:
> The load capacity of the conversion tyre should be equal to or greater than that of the original tyres, and must be adequate for the vehicle’s plated maximum axle loads.
> Tyres on 4x4 vehicles must be used in identical sets of 4 (same size, make, pattern, load index/speed symbol, category of use). This is to avoid mechanical problems with the transmission, and also to ensure optimum performance.
> The vehicle manufacturers' recommendations should be followed.
> Ensure that there is adequate clearance between the conversion wheel/tyre and the vehicle bodywork / mechanical components in both static and dynamic conditions.
> Verify that the proposed wheel width and diameter are compatible with the tyre size.
> Ensure that the fitted assembly (wheel + tyre) does not project beyond the bodywork and complies with all the necessary legal requirements.
> It is recommended that the overall diameter of the conversion tyre is equivalent to the original tyre overall diameter within a tolerance of +1.5% to -2%.
M+S marked tyres
> Tyres marked M+S are designed for Mud and Snow (winter) conditions
> M+S tyres with a speed rating lower than that of the original tyres may be legally fitted to a vehicle. However, the driving speed must not exceed the maximum speed allowed for the Speed Symbol of the tyres in use.
> A label reminding the driver of this lower maximum speed can be placed inside the vehicle in a position where it is clearly visible to the driver. In some countries outside of the UK and Ireland the use of such a label is a legal requirement
