BMW 4 Series Convertible (G23) specifications and photos
The BMW 4 Series Convertible (G23) represents the second generation of the brand's midsize luxury drop-top. Introduced in 2020, it transitions back to a classic soft-top roof, replacing the folding hardtop of its predecessor.
BMW 4 Series Convertible (G23) at a glance
Quick model context before comparing photos and trim-level specifications.
Revealed in late 2020, the second-generation 4 Series Convertible brings substantial structural and design updates over the outgoing model. BMW increased the overall footprint, stretching the length by 128 mm and the wheelbase by 41 mm, while also widening the track. This generation shifts away from a complex folding metal roof in favor of a lighter multi-layer fabric top, which contributes to improved handling and packaging. The car is positioned for buyers seeking a premium open-air driving experience with strong performance options, offering both rear-wheel drive and xDrive all-wheel-drive configurations across a range of gasoline and diesel powertrains.
- Power: 184-374 hp
- Engine displacement: 1995-2998 cc
- Transmissions: 8-Steptronic
- Seating: 4 seats
Photos, trims and specifications for BMW 4 Series Convertible (G23)
This model page brings gallery images, trim comparison, and detailed technical data together for the 2020 generation.
Estimate fuel cost
Use trim-level fuel consumption data to estimate monthly and yearly fuel spending.
Fuel costs are estimates. Real consumption can change with driving style, traffic, tires, weather, load, and market-specific equipment.
BMW 4 Series Convertible (G23) overview
Editorial context for design, cabin, performance, practicality, and buyer notes.
Design
The exterior is defined by a bold design language, most notably the prominent vertical kidney grille that pays homage to historic BMW models. The G23 features narrower headlights and a more aggressive front bumper design compared to the previous generation. Its new soft-top roof, available in black or grey, is 40 percent lighter than the old hardtop and can be opened or closed in 18 seconds at speeds of up to 50 km/h. These changes give the convertible a sleeker profile while maintaining structural rigidity.
Interior
Inside, the cabin features standard Vernasca leather upholstery and three-zone climate control. The switch to a soft top yields a slight 5 mm increase in front headroom. BMW offers several comfort-oriented options for open-air driving, including heated and ventilated front seats, an attachable wind deflector, and neck warmers integrated into the front headrests. The dashboard layout mirrors the 4 Series coupe, providing a driver-focused environment with premium materials.
Performance
The powertrain lineup includes a mix of turbocharged four-cylinder and inline-six engines. Gasoline options range from the 184-horsepower 420i to the 374-horsepower M440i xDrive, which features a 3.0-liter inline-six paired with a 48-volt mild-hybrid system. Diesel variants span from the 190-horsepower 420d up to the 340-horsepower M440d xDrive. All engines are mated to an eight-speed ZF automatic transmission. For enhanced driving dynamics, buyers can specify adaptive dampers, a variable sport steering system, and an M Sport rear differential.
Practicality
Despite being a convertible, the G23 offers reasonable everyday usability. The transition to a fabric roof has improved cargo capacity. The trunk now holds 385 liters when the roof is closed—a 15-liter increase—and 300 liters when folded, which is an 80-liter improvement over the older hardtop model. While rear legroom remains typical for a two-door convertible, the four-seat layout is practical for occasional passenger use.
Safety and tech
Structural reinforcements in the floor, engine compartment, and rear axle improve static torsional rigidity by four percent compared to the previous car, while pop-up aluminum roll hoops deploy automatically behind the rear headrests in the event of a rollover. Technology is centered around BMW Operating System 7, featuring a standard 10.25-inch central touchscreen and an optional 12.3-inch digital instrument cluster. The system supports over-the-air updates and real-time traffic data.
Buyer notes
When comparing trims for the 4 Series Convertible, note that mild-hybrid technology is standard on all diesel models and the six-cylinder gasoline M440i. The M Performance models (M440i and M440d) include xDrive all-wheel drive by default, whereas the four-cylinder versions are primarily rear-wheel drive. Equipment levels and optional performance packages, such as sport suspension or upgraded brakes, will vary depending on the specific market.
Trims and key specifications
Use this table to compare the main differences between available configurations.
| Trim / modification | Engine | Power | Seats | Transmission |
|---|---|---|---|---|
| 420i | 1998 cc | 184 hp | 4 | 8-Steptronic |
| 430i | 1998 cc | 258 hp | 4 | 8-Steptronic |
| M440i xDrive | 2998 cc | 374 hp | 4 | 8-Steptronic |
| 420d | 1995 cc | 190 hp | 4 | 8-Steptronic |
| 430d | 2993 cc | 286 hp | 4 | 8-Steptronic |
| M440d xDrive | 2993 cc | 340 hp | 4 | 8-Steptronic |
Specifications can vary by market, model year, and equipment package. Use the trim sections below to review the full data for each configuration.
BMW 4 Series Convertible (G23) photo gallery
15 images are collected here with the main specifications and trim data for this model.
Photo BMW 4 Series Convertible (G23)
Specifications by trim
Choose a configuration below to open full technical data grouped by category.
420i 39 specifications
Specifications
Performance and consumption
| Fuel consumption city, L/100 km | 7.4 |
|---|---|
| Fuel consumption highway, L/100 km | 5.4 |
| Fuel consumption combined, L/100 km | 6.1 |
| Top speed, km/h | 236 |
| Acceleration 0-100 km/h, s | 8.2 |
| Emissions standard | Euro VI |
Engine
| Engine | 2.0i |
|---|---|
| Engine code | B48A20 |
| Engine type | Internal combustion engine |
| Fuel type | Gasoline |
| Engine displacement, cc | 1998 |
| Cylinder layout | Inline |
| Number of cylinders | 4 |
| Valves | 16 |
| Turbocharger | + |
| Power, hp | 184 |
| RPM at max power | 5000-6500 |
| Torque, Nm | 300 |
| RPM at max torque | 1350-4250 |
Dimensions
| Seats | 4 |
|---|---|
| Length, mm | 4768 |
| Width, mm | 2081 |
| Height, mm | 1384 |
| Wheelbase, mm | 2851 |
| Front track, mm | 1573 |
| Rear track, mm | 1612 |
| Kerb weight, kg | 1765 |
| Gross weight, kg | 2185 |
| Fuel tank capacity, L | 59 |
| Turning circle, m | 11.4 |
| Width without mirrors, mm | 1852 |
| Trunk capacity, L | 385 |
Transmission and drive
| Transmission | 8-Steptronic |
|---|---|
| Transmission type | automatic |
| Drive | Rear-wheel drive |
| Number of gears | 8 |
| Transmission manufacturer | ZF |
| Automatic transmission | + |
| Transmission country | Germany |
430i 40 specifications
Specifications
Performance and consumption
| Fuel consumption city, L/100 km | 7.8 |
|---|---|
| Fuel consumption highway, L/100 km | 5.6 |
| Fuel consumption combined, L/100 km | 6.4 |
| Top speed, km/h | 250 |
| Acceleration 0-100 km/h, s | 6.2 |
| Emissions standard | Euro VI |
Engine
| Engine | 2.0i |
|---|---|
| Engine code | B48B20 |
| Engine type | Internal combustion engine |
| Fuel type | Gasoline |
| Engine displacement, cc | 1998 |
| Cylinder layout | Inline |
| Number of cylinders | 4 |
| Valves | 16 |
| Turbocharger | + |
| Compression ratio | 10.2:1 |
| Power, hp | 258 |
| RPM at max power | 5000-6500 |
| Torque, Nm | 400 |
| RPM at max torque | 1550-4400 |
Dimensions
| Seats | 4 |
|---|---|
| Length, mm | 4768 |
| Width, mm | 2081 |
| Height, mm | 1384 |
| Wheelbase, mm | 2851 |
| Front track, mm | 1573 |
| Rear track, mm | 1612 |
| Kerb weight, kg | 1765 |
| Gross weight, kg | 2185 |
| Fuel tank capacity, L | 59 |
| Turning circle, m | 11.4 |
| Width without mirrors, mm | 1852 |
| Trunk capacity, L | 385 |
Transmission and drive
| Transmission | 8-Steptronic |
|---|---|
| Transmission type | automatic |
| Drive | Rear-wheel drive |
| Number of gears | 8 |
| Transmission manufacturer | ZF |
| Automatic transmission | + |
| Transmission country | Germany |
M440i xDrive 38 specifications
Specifications
Performance and consumption
| Fuel consumption city, L/100 km | 9.3 |
|---|---|
| Fuel consumption highway, L/100 km | 6.2 |
| Fuel consumption combined, L/100 km | 7.4 |
| Top speed, km/h | 250 |
| Acceleration 0-100 km/h, s | 4.9 |
| Emissions standard | Euro VI |
Engine
| Engine | 3.0i |
|---|---|
| Engine code | B58B30TÜ1 |
| Engine type | Internal combustion engine |
| Fuel type | Gasoline |
| Engine displacement, cc | 2998 |
| Cylinder layout | Inline |
| Number of cylinders | 6 |
| Valves | 24 |
| Power, hp | 374 |
| RPM at max power | 5500-6500 |
| Torque, Nm | 500 |
| RPM at max torque | 1850-5000 |
Dimensions
| Seats | 4 |
|---|---|
| Length, mm | 4768 |
| Width, mm | 2081 |
| Height, mm | 1384 |
| Wheelbase, mm | 2851 |
| Front track, mm | 1573 |
| Rear track, mm | 1612 |
| Kerb weight, kg | 1765 |
| Gross weight, kg | 2185 |
| Fuel tank capacity, L | 59 |
| Turning circle, m | 11.4 |
| Width without mirrors, mm | 1852 |
| Trunk capacity, L | 385 |
Transmission and drive
| Transmission | 8-Steptronic |
|---|---|
| Transmission type | automatic |
| Drive | All-wheel drive |
| Number of gears | 8 |
| Transmission manufacturer | ZF |
| Automatic transmission | + |
| Transmission country | Germany |
420d 40 specifications
Specifications
Performance and consumption
| Fuel consumption city, L/100 km | 5 |
|---|---|
| Fuel consumption highway, L/100 km | 4.3 |
| Fuel consumption combined, L/100 km | 4.5 |
| Top speed, km/h | 236 |
| Acceleration 0-100 km/h, s | 7.6 |
| Emissions standard | Euro VI |
Engine
| Engine | 2.0d |
|---|---|
| Engine code | B47D20 |
| Engine type | Internal combustion engine |
| Fuel type | Diesel |
| Engine displacement, cc | 1995 |
| Cylinder layout | Inline |
| Number of cylinders | 4 |
| Valves | 16 |
| Turbocharger | + |
| Compression ratio | 16.5:1 |
| Power, hp | 190 |
| RPM at max power | 4000 |
| Torque, Nm | 400 |
| RPM at max torque | 1750-2500 |
Dimensions
| Seats | 4 |
|---|---|
| Length, mm | 4768 |
| Width, mm | 2081 |
| Height, mm | 1384 |
| Wheelbase, mm | 2851 |
| Front track, mm | 1573 |
| Rear track, mm | 1612 |
| Kerb weight, kg | 1765 |
| Gross weight, kg | 2185 |
| Fuel tank capacity, L | 59 |
| Turning circle, m | 11.4 |
| Width without mirrors, mm | 1852 |
| Trunk capacity, L | 385 |
Transmission and drive
| Transmission | 8-Steptronic |
|---|---|
| Transmission type | automatic |
| Drive | Rear-wheel drive |
| Number of gears | 8 |
| Transmission manufacturer | ZF |
| Automatic transmission | + |
| Transmission country | Germany |
430d 37 specifications
Specifications
Performance and consumption
| Fuel consumption combined, L/100 km | 5.6 |
|---|---|
| Top speed, km/h | 250 |
| Acceleration 0-100 km/h, s | 5.9 |
| Emissions standard | Euro VI |
Engine
| Engine | 3.0d |
|---|---|
| Engine code | B57D30M0 |
| Engine type | Internal combustion engine |
| Fuel type | Diesel |
| Engine displacement, cc | 2993 |
| Cylinder layout | Inline |
| Number of cylinders | 6 |
| Valves | 24 |
| Compression ratio | 16.5:1 |
| Power, hp | 286 |
| RPM at max power | 4000 |
| Torque, Nm | 650 |
| RPM at max torque | 1500 – 2500 |
Dimensions
| Seats | 4 |
|---|---|
| Length, mm | 4768 |
| Width, mm | 2081 |
| Height, mm | 1384 |
| Wheelbase, mm | 2851 |
| Front track, mm | 1573 |
| Rear track, mm | 1612 |
| Kerb weight, kg | 1765 |
| Gross weight, kg | 2185 |
| Fuel tank capacity, L | 59 |
| Turning circle, m | 11.4 |
| Width without mirrors, mm | 1852 |
| Trunk capacity, L | 385 |
Transmission and drive
| Transmission | 8-Steptronic |
|---|---|
| Transmission type | automatic |
| Drive | Rear-wheel drive |
| Number of gears | 8 |
| Transmission manufacturer | ZF |
| Automatic transmission | + |
| Transmission country | Germany |
M440d xDrive 37 specifications
Specifications
Performance and consumption
| Fuel consumption combined, L/100 km | 6.3 |
|---|---|
| Top speed, km/h | 250 |
| Acceleration 0-100 km/h, s | 5.1 |
| Emissions standard | Euro VI |
Engine
| Engine | 3.0d |
|---|---|
| Engine code | B57D30 |
| Engine type | Internal combustion engine |
| Fuel type | Diesel |
| Engine displacement, cc | 2993 |
| Cylinder layout | Inline |
| Number of cylinders | 6 |
| Valves | 24 |
| Compression ratio | 16.5:1 |
| Power, hp | 340 |
| RPM at max power | 4400 |
| Torque, Nm | 700 |
| RPM at max torque | 1750 – 2250 |
Dimensions
| Seats | 4 |
|---|---|
| Length, mm | 4768 |
| Width, mm | 2081 |
| Height, mm | 1384 |
| Wheelbase, mm | 2851 |
| Front track, mm | 1573 |
| Rear track, mm | 1612 |
| Kerb weight, kg | 1765 |
| Gross weight, kg | 2185 |
| Fuel tank capacity, L | 59 |
| Turning circle, m | 11.4 |
| Width without mirrors, mm | 1852 |
| Trunk capacity, L | 385 |
Transmission and drive
| Transmission | 8-Steptronic |
|---|---|
| Transmission type | automatic |
| Drive | All-wheel drive |
| Number of gears | 8 |
| Transmission manufacturer | ZF |
| Automatic transmission | + |
| Transmission country | Germany |
BMW 4 Series Convertible (G23) questions
Short answers based on the specifications and photos available in this catalog.
What type of roof does the G23 BMW 4 Series Convertible have?
The G23 generation uses a multi-layer fabric soft top, replacing the folding metal hardtop of the previous generation. It can be operated in 18 seconds at speeds up to 50 km/h.
Are all-wheel-drive versions available?
Yes, all-wheel drive (xDrive) is available. It comes as standard on the higher-performance M440i and M440d models.
How much trunk space does the 4 Series Convertible offer?
The trunk provides 385 liters of space with the roof closed. When the soft top is folded down, the cargo capacity is 300 liters.
What infotainment system is used in the 2020 model?
It uses BMW Operating System 7, featuring a standard 10.25-inch central display and an optional 12.3-inch digital instrument cluster, with support for over-the-air updates.