Mazda-MX-5-INSET (800x533)

Mazda has recently unveiled a surprise new MX-5 with an electrically folding hard-top roof, despite claiming the car would always stick to a canvas top.

The Japanese firm had said the fourth-generation would be soft-top only, in the interests of keeping weight down to the incredible target of just one tonne without a driver.

But at the New York International Auto Show Mazda unexpectedly revealed a new variant called the RF, with a type of roof not before seen on a Mazda.

A body panel behind the seats lifts completely out of the way, just like on the Porsche 911 Targa, letting the roof fold neatly away before the panel is lowered again.

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The panel incorporates chunky C-pillars that double as classic racing car-style aerodynamic humps behind the two seats, but the system is a significant amount heavier than the manual soft-top. So much so that Mazda is as-yet unwilling to confirm the increase.

Mazda says the boot is no smaller despite the extra cavity that holds the folded lid, but the system is a bit delicate and can only be operated at up to 6mph.

Both current engines will be built for RF models, giving buyers a choice of 129bhp 1.5-litre and 158bhp 2.0-litre units.

There’s no word yet on delivery dates or prices, but a modest cost increase is expected over the soft-top car in order to recoup investment on the roof design.