2021 BMW 4 Series Convertible

MSRP $53,100

Ranked #4 in Compact Convertible



2021 BMW 4 Series Convertible Price, Review, Ratings and Pictures

Updated on: August 5, 2021

Nathan Dyer's image
Nathan Dyer 

Senior Editor

The 2021 BMW 4 Series Convertible has been through some serious changes from the older model. The 2021 BMW 4 Series Convertible is a good option for those who are looking for a convertible that delivers excellent performance and great handling. The 2021 model is a new generation model with completely redesigned exterior bits.

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Exhilarating design

Engaging & vocal engine characteristics

Royal interior

High-end technology standard


Options list bigger than a restaurant menu

Forget second-row occupation

Tight cargo area

What's New?

Completely redesigned for 2021 model

More tech and features


vehicle bio

base price



dr Convertible


roadside assistance


Pictures & Videos


430i$53,100 onwards

Colors and Styles

2021 BMW 4 Series Convertible in Jet Black color
Jet Black

Vehicle images are guides only and may not reflect the model's exact specifications/features– exact specifications/features should be confirmed with the seller.

Expert Review, Pricing Analysis and Buying Guide

Well, it isn’t a V-6 monster, but with the twin-scroll turbo Inline-4 engine, you won’t feel like you are missing something. There are many things that go in its favor and make it a compelling buy for the segment. The competition in this convertible segment is all Germans like the Mercedes-Benz C300 convertible and the Audi A5 convertible.

2021 BMW 4 Series Convertible Front Seats
2021 BMW 4 Series Convertible Rear Seats

2021 BMW 4 Series Convertible Features

The 2021 BMW 4 Series Convertible comes in a single 430i trim, and you can upgrade to the M440i, but that lies in a whole other category. We will cover the M440i in a different article. The 430i comes equipped with a ton of features, and you will never miss out on any features with the 430i. The standard safety tech is also very generous for the segment. The 8.8-inch touchscreen display comes with standard Android Auto and Apple CarPlay for seamless connectivity.





Key Features

Auto-dimming mirrors, push-button start


BMW signature LED headlights


Synthetic leather upholstery


Heated, power-folding mirrors


Power adjustable front seats with memory function 


8-8-inch touchscreen, 10-speaker audio system with Android Auto & Apple CarPlay.


Navigation system

BMW has a plethora of optional packages and standalone features like a Power trunk lid, ventilated front seats, drive recorder, Harman Kardon premium audio, neck warmers, and a wireless charging pad. The standard features are good enough and get everything covered pretty well.

We recommend

The BMW 430i gets a powerful engine with a good list of standard features on offer. Even if you miss out on some things, you can anyway spec your 430i in every way with optional packages. With that said, the 430i with the M Sport package & Executive package will be the practical choice here as it will stay well below the sub $60,000 price point, and you will still have a nice vehicle.

2021 BMW 4 Series Convertible Engine and Performance

The 2021 BMW 430i comes equipped with a 2.0L Turbo Inline-4 engine and packs some serious horsepower. Thanks to the upgraded twin-scroll turbo, the engine returns 255 hp and 294 lb-ft of torque. The performance is never an issue with the engine, as you have enough power on reserve whenever you put your foot down on the throttle. The best-in-class peak torque is delivered very low down in the rev band, which makes the drivability even better.

2021 BMW 4 Series Convertible In Acceleration Mode

The 8-speed automatic transmission shifts really smoothly, and you won’t reach those paddle shifts anytime sooner. The 4 Series BMW comes with various driving modes like ECO PRO mode aimed at fuel economy, the Comfort mode for everyday driving scenarios, and Sports mode that stiffens up the suspension and lets the engine rev happily ever after. With all these driving modes, you will rarely feel the same in your car.


2021 BMW 4 Series Convertible

2021 Mercedes-Benz C300 Cabriolet

2021 Audi A5 Cabriolet






2.0L Intercooled Turbo I-4

2.0L Intercooled Turbo I-4

2.0L Intercooled Turbo, Gas/Electric I-4






8-Speed Automatic

9-Speed Automatic

7-Speed Dual-Clutch Automatic


255hp @ 5,000rpm

255hp @ 5,800rpm

261hp @ 6,300rpm


294lb-ft @ 1,550rpm

273lb-ft @ 1,800rpm

273lb-ft @ 4,200rpm

0-60 MPH (seconds)




Quarter-Mile (seconds)




Top-Speed (MPH)




Our little champion here isn’t the fastest in the segment, but the differences are in fractions of seconds. The 2021 Audi A5 Cabriolet is the fastest convertible of the lot, but the Bimmer is not far behind. The Merc comes in last, but it is also not very far behind the other two convertibles in the comparison. When comparing the price range, Mercedes C300 is the most expensive option in the competition.

How well does the 2021 BMW 4 Series Convertible handle?

The 2021 BMW 430i convertible with all stock options isn’t the sports car that BMW is known for as it still lacks some characteristics of its M series counterparts. In the Comfort mode, the car adjusts itself for soft, more plush ride quality, and because of that, on the sharp turn you might experience some body roll and that can also be cured with the optional M Sport adaptive dampers. The steering feedback is the only downside on this 430i as it doesn’t communicate well with the driver even with the dynamic handling package. It just weighs in the steering depending on how sharp turns the car is making.

2021 BMW 4 Series Convertible Front Angle Driving View

In the sports mode though, even if you are running this car stock, the suspension setup tightens up, the car becomes much more responsive, and the engine revs much higher before every gear shift. The cabin is silent but yet you will hear the engine roar as you floor the pedal; that's because the sound seeks in through the speakers. A cool gesture from BMW, hear your car's engine but not the ambient noises.

Braking Performance

The commercial racing prowess of BMW is being applied here in the 4 Series cars, and even though the actual rotor sizes aren’t available, the performance upgrades that are available on this car can ensure precise braking performance in any condition. It takes only 105 feet of distance to stop the BMW 4 Series Convertible from 60 mph to a standstill. The brakes feel progressive and support the handling very well.


2021 BMW 4 Series Convertible

2021 Mercedes-Benz C300 Cabriolet

2021 Audi A5 Cabriolet

Brake Rotors: Front (inches)




Brake Rotors: Rear (inches)




Curb Weight (lbs)




60-0MPH (feet)




With the optional M Sport brakes, the car stops at just 105 feet from 60 mph speed. The Bimmer offers the best braking performance against the comparison. Although it weighs almost similar to the other cars in the segment, the braking performance is good enough to impress any driver. Mercedes takes the highest distance of 124 feet to achieve the 60-0 mph feat.

2021 BMW 4 Series Convertible Fuel Economy

The BMW 4 Series Convertible aces this section with a considerable margin. The 430i offers 24 MPG in the city and 33 MPG on the highway. The fuel tank could have been a little larger, but we guess smaller body size hinders their ability to do so. The 2021 4 Series also come with the unique cylinder deactivation feature which might help to get a better economy but that is yet to be tested.


2021 BMW 4 Series Convertible

2021 Mercedes-Benz C300 Cabriolet

2021 Audi A5 Cabriolet

MPG (City)




MPG (Highway)




MPG (Combined)




Fuel Capacity (Gallons)




Range (City/Highway/Combined, in Miles)




Most of the Merc cars take home the crown when it comes to fuel economy all thanks to their EQ Boost tech, but this time we have a new champion- the 2021 BMW 4 Series Convertible. Still, the C-Class Cabriolet has a good fuel economy for the segment. The 2021 Audi A5 Cabriolet has the smallest tank and range compared to the other two cars.

2021 BMW 4 Series Convertible Interior

The 2021 BMW 4 Series Convertible is a premium sports car we are talking about, and the interior is just gorgeous. European automakers don’t believe in strange designs and curvy lines except for Mercedes. The dashboard design on the 430i reflects it as it has no serious curves but comes with nice glossy panels and aluminum trims. The steering wheel also gets a faux leather treatment that can be had with a heating function.

2021 BMW 4 Series Convertible Seats

The seats on this car are very nicely bolstered and have faux leather upholstery and can be upgraded to genuine leather. Power adjustments are standard with manually adjustable leg extension. To make your experience more comfortable, heated and ventilated seats are available as standalone extras. The second-row seats can accommodate 2 passengers if they are small enough, otherwise, it is difficult. The seats are caved in, and because of that, the passenger sits low in the car, getting a better headroom overall. 


2021 BMW 4 Series Convertible

2021 Mercedes-Benz C300 Cabriolet

2021 Audi A5 Cabriolet

Seating Capacity




Front Row (Head/Shoulder/Leg, in inches)




Rear Row (Head/Shoulder/Leg, in inches)




Cargo Capacity (cubic feet)




The 2021 BMW 4 Series convertible will have some limitations in cargo capacity due to its body style, yet it is doing much better than the competition. The 12 cubic feet of trunk space isn’t massive, but it will lower down further if you have the roof down. The folding roof mechanics get stored in the boot and acquire some of the space. Inside the cabin, there are usual storage spaces like cup holders on the center console and on the doors. Below are some of the best interior features of the 4 Series:

  • Synthetic leather upholstery
  • Soft top
  • Tri-zone automatic climate control
  • Seat belt chauffeur
  • Neck warmers

What’s there to keep you entertained?

The entertainment duties in the 2021 BMW 4 Series Convertible are handled by the 8.8-inch touch screen, and it can be upgraded to a 10.3-inch screen which is wider than the standard one. Android Auto & Apple CarPlay are standard. The touch response is very good, and the overall resolution is great. Texts are sharp and clear, and it especially becomes helpful while using maps. The standard 10 speaker sound system does a decent job, and for serious music enthusiasts, a 19 speaker Harman Kardon sound system is available for $900. Below are some highlights of this infotainment system:

  • 8.8 inch/ 10.2-inch touch screen
  • Android Auto & Apple CarPlay
  • Wi-Fi hotspot
  • USB & Bluetooth
  • 10 speaker sound system
  • Harmon Kardon sound system (Optional)

2021 BMW 4 Series Convertible Exterior

The 2021 BMW cars are odd-looking, thanks to the new bigger grille. The overall design of the 4 Series is elegant in the base trim as there are no sharp front bumper elements present, as you go higher, the front bumper gets aggressive with air intakes and extended lower lips. The LED headlight setup remains the same. The 18-inch wheels on the base trim are sporty enough, and there’s a different design for each trim, thus the M440i gets a different wheel design. 

2021 BMW 4 Series Convertible Front Angle View

The side profile reveals a chiseled midsection of the car which again blends in with the remaining bodywork at the rear end. At the back, it is rather toned down a bit with just a LED taillight setup. You can visually upgrade this car to such limits that it will start looking like a totally different BMW altogether. The convertible weighs 3,918 lbs and stands 5.0 inches above the ground.


2021 BMW 4 Series Convertible

2021 Mercedes-Benz C300 Cabriolet

2021 Audi A5 Cabriolet

Curb Weight (lbs)




Length (inches)




Width (inches)




Height (inches)




Ground Clearance (inches)




Wheelbase (inches)




The 2021 4 Series convertible is the longest and the widest car in its segment, and it will improve the overall stability of this car on the highways. The ground clearance is also higher on the BMW, which will make it easier to use on a daily basis without the worry of being scrapped at the bottom. Below are some attention-grabbers of the 4 Series' exterior:

  • LED Headlights
  • Signature BMW DRLs
  • New bigger grille
  • Multiple wheel designs based on the trim
  • 19” alloy wheels

2021 BMW 4 Series Convertible Safety

The 2021 BMW 4 Series has been built on the same platform as the 3 Series but with some improvements in dimensions and weight reduction. The new chassis is now 400 lbs lighter but stiffer than the predecessor. The 2021 BMW 4 Series hasn't been crash-tested yet by the NHTSA as the tradition continues. The 3 Series BMW has got 5 stars in all the crash tests, and considering the chassis similarities between the 4 Series and 3 Series, we should expect the same results. The car also comes with standard safety features such as parking sensors and automatic emergency braking. Let’s see what else we have on the safety list:

  • Automatic parking assist
  • Blindspot monitoring
  • Forward collision warning
  • Automated Lane keep assist & lane departure warning
  • 360-degree camera system.
  • Adaptive cruise control with stop/go feature

2021 BMW 4 Series Convertible Competition

2021 BMW 4 Series Convertible vs 2021 Mercedes-Benz C300 Convertible

If we compare them with respect to the performance, both are more or less the same. The interiors are different on both cars. Mercedes has a more rounded interior theme.

2021 Mercedes-Benz C300 Convertible

One thing Mercedes doesn’t have is the performance and cosmetic options that the BMW has. For performance upgrades, you will need to opt for the expensive AMG variant. So, it all depends on your choice.

2021 BMW 4 Series Convertible vs 2021 Audi A5 Convertible

The 2021 Audi A5 is a stunning-looking car, even better than the BMW. Even the interior of the Audi is classy and elegant. The performance is a tad bit better on the Audi.

2021 Audi A5 Convertible

The decision here depends on the exterior and the interior. The new grille design on the BMW has made things easier now. The more affordable price point of Audi makes it a better choice than the Bimmer.

2021 BMW 4 Series Convertible Final Verdict

The 2021 BMW 4 Series convertible is a great secondary option to have in your garage. Why secondary? Try seating your friends in the second row, you will get the answer. This car performs great, and with performance upgrades, it keeps getting better. The design is striking, and so is the fuel economy. If you can live with the cramped rear row, the 4 Series convertible is a great sports car to have joyrides in.