Construction of Run Flat tyres
Run Flat tyres allow the driver to continue driving after the loss of pressure. On average you may then travel up to 50 miles with speeds up to 50 mph (depending on the technology), due to reinforced sidewalls. This allows you to drive straight to a tyre service station, without having to change the wheel on the side of the road. What is more, having Run Flat tyres means that you do not need the spare wheel.
Run Flat - meaning and classification
The first Run Flat tyres were developed before World War II. Initially, they found their application in military vehicles – they were a protective feature in case the tyre was shot through. The research continued after the war and the very first non-military vehicle with Run Flat tyres as part of original equipment was a Porsche 959. Later on they were often fitted to Chevrolet Corvette cars and nowadays, among others, across the BMW model range.
The Run Flat tyres require on-board pressure sensors fitted to inform the driver about the loss of pressure. It may happen that a person keeps on driving for even a few weeks without realising that there is something wrong with the tyre. There are other modifications to a car to adapt it to use Run Flat tyres. Such a car has different suspension set-ups (BMW makes it softer than standard), as well as certain changes are introduced to the car’s electronic systems, such as ABS or ESP. It is then not recommended to use regular tyres if the car was designed to use Run Flat tyres.
The Run Flat tyres should be fitted only at professional fitting stations with necessary equipment. Fitting such a tyre using regular machines may damage the tyre and if it is fitted incorrectly it may burst and cause a serious road accident.
The Run Flat tyres offer the highest level of safety. Even when travelling at high speeds a puncture does not mean the loss of control of the car. Such tyres are often fitted to premium class cars with high engine power, which are capable of reaching considerable motorway speeds. In that case having Run Flat tyres minimizes all the risks. Quite a number of sports cars also have limited space in the boot, therefore Run Flat tyres become indispensable. They are also more resistant to mechanical damage such as hitting a curb or a pothole.
The drawbacks of Run Flat tyres are their higher price, lower ride comfort (a Run Flat is stiffer than a standard tyre), increased fuel consumption (due to higher level of rolling resistance) and no possibility of repairing such tyres. Regardless of these shortcomings, Run Flat tyres are considered to be a perfect choice, offering safety and comfort for the driver (no worries about punctures or having to change the wheel).The markings for Run Flat tyres
vary according to the manufacturer: DSST – Dunlop, EMT – Goodyear, HRPS – Hankook, PAX – Michelin, RFT – Bridgestone, RSC – BMW, SSRF – Pirelli, SSR – Continental, TRF – Toyo, XRP – Kumho, ZP – Michelin, ZPS – Yokohama. In our offer we have a wide selection of the run flat tyres for different vehicles. Everyone will find something to match their expectations. Shop for the Run Flat tyres!