2021 BMW 4 Series convertible patent images surface

Some patent images of the upcoming G23 2021 BMW 4 Series convertible have found their way online, giving us a pretty good idea of what the new drop-top will look like. And yes, the massive front grilles carry over from the new 4 Series coupe.

The patent images were found on the Chinese National Intellectual Property Administration database, showing all angles of the new model. Although the finer details are not depicted in the basic digital drawings, the overall design and proportions for the upcoming sports car are quite clear. It looks like the model will continue with a soft-top roof design as well.

Like the coupe the 2021 4 Series convertible will jump to BMW’s latest CLAR platform. This should bring in some improvements to interior space, safety, efficiency, and driving dynamics. Specifically, the new coupe is 128mm longer than the outgoing model, with 41mm added to the wheelbase, and 27mm added to the width. The height is also increased but by only 6mm. We’d expect similar dimensions for the convertible.

BMW is likely to offer the same range of powertrains as the coupe, spanning from the 420i, 430i, to the top M440i xDrive. The first two are powered by a 2.0-litre turbo four-cylinder petrol engine producing 135kW/300Nm and 190kW/400Nm, while the M440i uses a 3.0-litre turbo inline-six developing 285kW/500Nm.

A 420d is also offered in the coupe in some markets, featuring a 2.0-litre turbo-diesel four-cylinder that develops 140kW and 400Nm. It can cover 0-100km/h in a respectable 7.1 seconds, or 7.4 seconds when optioned with the xDrive all-wheel drive system.

Given the convertible is usually a bit heavier than the coupe, we’d anticipate the 0-100km/h times to be slightly slower than the coupe. For example, the top M440i xDrive does the sprint 4.5 seconds in the coupe, which might fall to around 4.7 seconds in the convertible version.

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BMW will probably unveil the new 4 Series drop-top some time later this year, with sales likely to kick off in Australia during the first half of next year. The new coupe is scheduled to arrive here in October – head over to our previous report for details on local pricing and lineup structure.

Brett is the editor and founder of PerformanceDrive. He's obsessed with driving, having played with Matchbox cars until he was tall enough to drive a real one. After initially working as a mechanic, Brett earned a degree in journalism and entered media as an editorial assistant at Top Gear Australia magazine. He then worked at CarAdvice.com.au. His dream is to live next door to the Nurburgring in Germany.