Mercedes SLR Roadster and Porsche 911 Turbo Cabriolet both promise 0-62mph in 3.8 seconds.
Mercedes boldly claims that the Roadster version of the McLaren SLR will have identical performance to the current coupe. That means an astonishing roof-down top speed of 207mph and a 0-62mph time of just 3.8sec, making it the fastest full convertible in series production when it goes on sale in September.
Finding space for the folded roof was always going to be a headache because the SLR is very tightly packaged in coupe form. Although anyone spending in excess of £300K might expect an SL-style folding steel roof, it was impossible to fit one in. Instead Mercedes developed a special fabric roof that retains its structural integrity at high speed but can disappear under an aluminium cover into a shallow cavity created behind the seats. The roof folds away electrically but is not fully automatic – the driver must unlatch it from the screen header before using the button.
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