When replacing car tyres the ideal method would be to change all four at the same time, thus maximising the roadholding and evenness of grip. However as tyres on different axles usually wear out at different rates this is economically unsatisfactory. etyres’ recommendation is that if only two new tyres are to be fitted, they should always fitted to the rear axle, with the rear tyres moved to the front wheels. (Obviously this does not apply to cars that have tyres of different sizes on different axles). The reason for this is that, particularly in wet conditions, the rear tyres, with newer tread and deeper grooves, will have better grip than the front ones. Therefore if the car does lose traction it will be the front end that starts to slide. This is much easier to control than a skid from the rear wheels.