The SSR system is a runflat technology developed by Continental especially for low section tyres, which still keeps the tyres compatible with all standard rims. The SSR principle is based on a self-supporting reinforced sidewall. In case of a puncture, this prevents the sidewall from being crushed between the rim and the road, and the tyre from slipping off the rim, which makes a spare tyre obsolete. Not having to carry a spare tyre means a reduction in weight, which improves fuel efficiency. It also adds up to 80 litres of free space in the boot. Fitting on four positions is highly recommended, if not yet mandatory by law and a tyre repair is not allowed.