Full specifications
BMW 4-Series 420i Cabrio Specifications
Complete technical specifications for the BMW 4-Series 420i Cabrio — 184 hp, petrol, convertible, 2021. Performance highlights: 0–100 km/h in 8.2 s, top speed 236 km/h (147 mph), consumption 5.7 l/100km (49.6 mpg UK · 41.3 mpg US).
General · 2 fields
Vehicle class
Passenger Car
Market segment
G (Sporty)
Fuel & Engine · 11 fields
Bore
82 mm
Catalytic converter
Closed-loop
Compression ratio
11 :1
Fuel system
Direct Injection
Fuel tank capacity
59 L (15.6 gal US)
RPM at 100 km/h
1,450 rpm
RPM at 130 km/h
1,900 rpm
Stroke
95 mm
Turbocharged
Yes
Valve actuation
DOHC
Valves per cylinder
4
Consumption (NEDC) · 2 fields
Urban consumption
7.1 l/100km (39.8 mpg UK · 33.1 mpg US)
Extra-urban consumption
4.9 l/100km (57.6 mpg UK · 48.0 mpg US)
Chassis · 11 fields
Front spring type
Coil Springs
Rear spring type
Coil Springs
Front anti-roll bar
Yes
Rear anti-roll bar
Yes
Front brakes
Ventilated Discs
Front suspension
MacPherson Struts
Rear brakes
Ventilated Discs
Rear suspension
Multilink
Turning circle
11.4 m (37.4 ft)
Front tyre size
225/50R17
Rear tyre size
225/50R17
Weights · 9 fields
Ball pressure
75 kg (165 lb)
Front axle weight
990 kg (2,183 lb)
Gross vehicle weight
2,185 kg (4,817 lb)
Kerb weight
1,665 kg (3,671 lb)
Payload
520 kg (1,146 lb)
Rear axle weight
1,240 kg (2,734 lb)
Roof load
80 kg (176 lb)
Towing weight (braked)
1,600 kg (3,527 lb)
Towing weight (unbraked)
750 kg (1,653 lb)
Luggage / Load · 2 fields
Boot capacity
385 L (13.6 cu ft)
Boot sill height
680 mm (26.8 in)
Exterior Sizes · 7 fields
Length
4,768 mm (187.7 in)
Width
1,852 mm (72.9 in)
Height
1,384 mm (54.5 in)
Wheelbase
2,851 mm (112.2 in)
Front track
1,575 mm
Ground clearance
124 mm (4.9 in)
Rear track
1,611 mm
Interior Sizes · 12 fields
Front legroom
940-1155 mm
Front headroom
940-1030 mm
Front seat back length
650 mm
Front seat length
540 mm
Step-in height
480 mm (18.9 in)
Interior width front
1,410 mm
Rear legroom
520-750 mm
Rear headroom
880 mm
Rear seat back length
640 mm
Rear seat length
470 mm
Rear seat height
315 mm
Interior width rear
1,130 mm
Safety · 30 fields
Crash test rating
5 stars
ABS
Standard
EBD
Standard
Brake assist
Standard
ESP
Standard
Traction control
Standard
Limited slip differential
Not Available
Electronic damping
Optional
Automatic level control
Not Available
Hill start assist
Standard
Forward collision warning
Standard
Autonomous emergency braking
Optional Package
Pedestrian AEB
Standard
Lane keeping assist
Standard
Steering assist
Optional Package
Blind spot detection
Optional
Fatigue detection
Standard
Tyre pressure monitoring
Standard
Night vision
Not Available
Pre-crash system
Optional Package
High beam assist
Optional
Traffic sign recognition
Standard
Cross traffic warning
Optional Package
Driver airbag
Standard
Passenger airbag
Standard
Side airbags
Standard (Front)
Curtain airbags
Standard (Front & Rear)
Driver knee airbag
Not Available
ISOFIX
Standard
Emergency call (eCall)
Standard
Comfort · 15 fields
Central locking
Standard
Keyless entry/start
Optional
Smartphone key
Not Available
Start button
Standard
Power steering
Standard
Steering wheel controls
Optional
Electric windows
Standard (Front)
Cruise control
Standard
Air conditioning
Standard (Automatic)
Dual zone climate
Standard
Parking sensors
Standard (Front & Rear)
Reverse camera
Standard
Park assist
Standard
Electric parking brake
Standard
Start/stop system
Standard
Interior · 32 fields
Seat height adjustment
Standard (Driver & Passenger)
Lumbar support
Optional
Electric seat adjustment
Standard
Heated seats
Optional
Ventilated seats
Not Available
Sport seats
Standard
Leather steering wheel
Standard
Adjustable steering
Standard
Heated steering wheel
Optional
Leather upholstery
Optional
Rear headrests
Standard
Folding rear seats
Not Available
Sliding rear seats
Not Available
Armrest
Standard
Pre-heating
Optional
Auto-dimming mirror
Standard
Rev counter
Standard
Trip computer
Standard
Digital instruments
Not Available
Head-up display
Optional
Audio system
Standard
Digital radio (DAB+)
Standard
Audio steering controls
Standard
Audio input
Standard
Navigation
Standard
Bluetooth
Standard
Wireless charging
Optional
Apple CarPlay
Optional
Android Auto
Not Available
OTA updates
Not Available
Outside temperature
Standard
Reading lights
Standard
Exterior · 21 fields
Rain sensor
Standard (Rain Sensor)
Alloy wheels
Standard
Sunroof
Optional
Panoramic roof
Not Available
Roof rails
Not Available
Metallic paint
Optional
Body-coloured bumpers
Standard
Tinted glass
Standard
Privacy glass
Optional
Electric boot
Standard
Electric mirrors
Standard (Heated)
Folding mirrors
Optional
Auto-dimming ext. mirrors
Standard
Indicators in mirrors
Standard
Front fog lights
Optional
Automatic headlights
Standard
Xenon headlights
Not Available
LED headlights
Standard
LED tail lights
Standard
Headlight washers
Not Available
Alarm
Optional
Service & Warranty · 3 fields
Service interval
variable / 2 years
General warranty
3 years, onbeperkt
Body warranty
12 years
Costs · 1 fields
Road tax quarterly (NL)
€321