Maserati’s striking GranTurismo will soon be available with a canvas roof, offering some of the best convertible motoring around.Due for public unveiling at the Frankfurt motor show in September, the new Maserati, named GranCabrio, replaces the GranTurismo’s sheet metal roof with a canvas top. Traditional convertible motoring enthusiasts will be thrilled at Maserati's design decision to eschew an intricate folding metal hard-top for old-school canvas.Benefits of the traditional canvas top – compared to more contemporary folding metal-roof arrangements – are its lower weight and less intrusive packaging, allowing the GranCabrio to retain better boot-space with the roof retracted. Boasting what Maserati claims to be the longest wheelbase in class, GranCabrio features two rows of seating – a first for the Italian manufacturer in convertible form. Although we have yet to see images of the GranCabrio with its canvas roof up – always the least aesthetically flattering configuration for a convertible – the GranTurismo lines have been expertly transposed to convertible configuration motoring with this latest car. Mirroring its coupe sibling mechanically, GranCabio is powered by the company’s larger capacity V8 from the GranTurismo S. This 4.7l engine produces 323kW and 490Nm of peak rotational force, distributing drive to the rear axle via a ZF six-speed automatic transmission. Makes a tremendous sound too.Many questions are sure to be asked of the GranCabrio’s torsional rigidity. Exactly which engineering principles Maserati have applied to ensure the convertible has similar handling fluidity and structural rigidity to the GranTurismo will be answered when the car is officially shown at Frankfurt in three weeks time. It will be assembled at the Viale Ciro Menotti factory in Modena.