2021 BMW 4 Series Convertible: prices, specification and performance

New BMW 4 Series Convertible replaces the coupe’s fixed metal roof with a folding fabric version but retains the love/hate styling

James Allen
Nov 29, 2020

The new BMW 4 Series is already - for better or for worse - one of the most distinctive cars on the road, due to its attention-grabbing looks. But what if you want to make it stand out from the crowd even more? Enter the latest iteration of the BMW 4 Series Convertible.

While the looks are the big talking point about this latest generation 4 Series, there’s more to the car than its styling cues. For instance, BMW is pretty proud of the folding roof on the new 4 Series Convertible; according to the car maker, the fabric roof is much lighter than an equivalent metal setup, yet offers similar amounts of noise and thermal insulation.

Like the coupe version, the drop-top 4 Series is also available with a variety of engine options - ranging from entry-level economy-focused four-cylinder petrols and diesels, to more powerful performance-orientated engines with up to 370hp on tap.

Depending on the engine available, the car will also be available with either rear-wheel drive or all-wheel drive, though you’ll only be able to have a 4 Series Convertible, at least initially, with an eight-speed automatic gearbox.

Prices for the new BMW 4 Series Convertible will start from £45,785 at launch, when the car goes on sale in the UK in March 2021.

Quick facts

  • New drop-top BMW 4 Series unveiled
  • Roof opens and closes in 18 seconds
  • Petrol and diesel engines available
  • Automatic gearbox only
  • Prices from £45,785
  • On sale from March 2021

2021 BMW 4 Series Convertible folding roof tech

A good place to start with the new BMW 4 Series Convertible is its folding fabric roof setup. As well as being its defining feature over other 4 Series versions, it’s also an interesting piece of tech - thanks to the glass rear window and the insulation it’s installed in the roof lining, BMW claims the 4 Series Convertible has similar refinement with the roof up as other hard top convertible cars, while also being around 40% lighter than the folding metal setup on the previous drop-top BMW 4 Series.

According to BMW, the 4 Series Convertible’s roof can be raised or lowered at the touch of a button in 18 seconds. It’s also possible to operate the roof at speeds of up to 31mph, which is on par with rivals like the Audi A5 Cabriolet and Mercedes-Benz C-Class Cabriolet and means you shouldn't get stuck at the lights waiting for the roof to fold before the car will let you pull away.

2021 BMW 4 Series Convertible performance

Just like the fixed-roof coupe version, the 4 Series Convertible is available with a decent array of engine options. An overwhelming majority of these - including the sole diesel engine that’s available at launch - are turbocharged 2.0-litre four-cylinder engines, with the only exception being the 3.0-litre turbocharged six-cylinder petrol engine that’s available in the range-topping ‘M440i’ version.

The number of driven wheels also depends on the engine under the bonnet. The four-cylinder engines will (for the time being, at least) only be available with rear-wheel drive; in contrast, the most powerful petrol engine is exclusively offered with all-wheel drive. Irrespective of the engine, though, all 4 Series Convertibles come with an eight-speed automatic gearbox.

Even more engines are on the way, too. A 286hp mild hybrid diesel engine will join the 4 Series Convertible range by July 2021, and a 340hp mild hybrid diesel is due to arrive sometime in November 2021. There’s no word yet, though, on whether BMW plans to launch a high performance M4 Convertible version anytime soon.





Acceleration (0-62mph)

Top Speed

Fuel economy

CO2 emissions


420i sDrive




8.2 secs





430i sDrive




6.2 secs





M440i xDrive




4.9 secs





420d sDrive




7.6 secs





430d sDrive




5.9 secs





M440d xDrive




5.1 secs






2021 BMW 4 Series Convertible specifications

Full specifications will be revealed closer to the car’s launch in early 2021, though BMW has spilled the beans on some of the equipment that’ll be available on the new drop-top 4 Series. Items such as 10.3-inch touchscreen media system, climate control and a driver assist system that allows the car to autonomously reverse itself into a parking spot come as standard on entry-level M Sport cars, with higher-spec M Sport Pro versions being available with additional features like adaptive suspension.

A variety of optional extras will be available, too. One of the more interesting ones is the Air Collar system, which uses heater vents built into the headrests to blow warm air onto the driver’s neck - meaning you can still make the use of the folding roof during the colder periods of the year.

BMW hasn’t yet said how much space is inside the 4 Series Convertible’s cabin, though it’s likely not too dissimilar to the room in the regular car - meaning there should be decent amounts of legroom all around, though taller rear seat passengers may be left wanting for headroom.

In contrast, boot space has taken quite a hit on the drop top version: while the coupe has a decent 440 litres of luggage space, the convertible has 380 litres, which is reduced even further to 300 litres once you fold the roof down.

2021 BMW 4 Series Convertible prices

BMW has pencilled in a March 2021 launch date for the new 4 Series Convertible. How much the car will cost will depend greatly on which version you go for: prices at launch start at £45,785 for entry-level cars, and climb to £59,645 for the range-topping 374hp petrol-powered version.


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