Run-flat tyres

Since their introduction, the benefits of Run-flat tyre technology have proved themselves time and again. The new Z4 3.0si Coupe is equipped with Run-flat technology. Unlike conventionally shod cars that can experience a slow puncture or even a blow-out situation, conservative advice says a driver can continue for 150 miles at 50mph with a punctured Run-flat tyre, while still retaining the benefits of the DSC+ traction control system and ABS brakes. In addition, Run-flat tyres obviate the inconvenience and danger associated with changing a wheel at the side of the road. 

The major breakdown services attend more than a million tyre incidents in the UK every year. BMW's own research has shown that there were 9,719 emergency call-outs in 2005 for tyre-related problems on BMWs and MINIs. Of these, 93 per cent were owners of cars with conventional tyres fitted. The remaining seven per cent were from owners of cars with Run-flat tyres and were usually because of a damaged wheel or alike. It is estimated that approximately 3,000 drivers of Run-flat tyre-equipped BMWs and MINIs who suffered a puncture in 2005 were able to get home or to a dealer without having to perform a potentially dangerous wheel-change.

Finally, and from a driving perspective, the removal of the spare wheel and consequent jack and tools eliminates approximately 20 kilograms from the rear of the car, lowering the centre of gravity and thus further improving the handling characteristics.

Such safety factors and convenience are clearly of paramount importance. However, during the course of the development of the M Coupe, engineers from BMW M evaluated the Run-flat and conventional tyres for many thousands of miles around the infamous Nürburgring. While each tyre had its own benefits, it was concluded that the extreme levels of performance demanded by 'M' customers necessitated the fitment of 'conventional' tyres as standard on all Z4 M Coupes. 

Importantly, the wheels of the Z4 M Coupe feature the new EH (extended hump) design that prevents the tyre coming off the wheel, even in the event of a high-speed blowout. Punctures of up to six millimetres in size can easily be sealed using the M Mobility System located in the boot, consisting of a small compressor and rapid-action sealant. Without a spare wheel, the same weight benefit as the Run-flat tyre solution is achieved and the car can easily travel at speeds of up to 50mph until a replacement tyre is sought.



Tyre Puncture Warning System

The use of Run-flat tyre technology goes hand-in-hand with the Tyre Puncture Warning System fitted as standard on the Z4 Coupe. An audiovisual signal warns of a possible puncture and the driver can then moderate his driving style before checking the tyres at a convenient opportunity.




Market
Sport models - an even sportier sports Coupe

Historically, Sport models have proved highly successful in all BMW's model ranges, with six-cylinder 3 Series Sport models accounting for 65 per cent of sales and up to 95 per cent of all X5 vehicles being bought as Sport models. With this success, a Sport model is now offered on the new Z4 3.0si Coupe and is expected to account for approximately 80 per cent of all sales.

Sport models feature 18-inch M double spoke or optional 18-inch composite alloy wheels, M Sports seats covered in Dakota leather upholstery, anthracite headlining, a three-spoke M leather steering wheel and M Sports Suspension for those demanding a particularly sporting drive.



Niche sales volumes

While a two-seater car holds significant emotional appeal, purchasing practicalities often preclude the heart ruling the head.

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