Car comparison

BMW 4 Series Convertible (G23) 430ivsBMW X4 (G02 LCI) · Facelift 2021 30i

Compare specs, acceleration, fuel consumption, dimensions, practicality, and estimated running costs side by side.

New comparison

BMW 4 Series Convertible (G23)

430i

258 hp1998 ccGasolineRWDAutomaticTurbochargedCabriolet / convertible2020-2024

BMW X4 (G02 LCI) · Facelift 2021

30i

245 hp1998 ccGasolineAWDAutomaticTurbocharged2021-2025

Comparison overview

Use the estimates as comparison hints and verify exact figures before making decisions.

BMW 4 Series Convertible (G23) 430i

Quickest 0-100 km/h
6.2 s
Fastest top speed
260 km/h
162 mph Unrestricted
250 km/h
155 mph Restricted
Most powerful
258 hp
192 kW
Highest torque
400 Nm
295 lb-ft
Lightest
1,715 kg
3,781 lb
Best power-to-weight
150 hp/t
112 kW/t
6.6 kg/hp
Lowest combined fuel consumption
6.4 L/100 km
36.8 mpg US
44.1 mpg UK
Best estimated range
922 km
573 mi
Best performance score
61/100
Best economy score
90/100

BMW X4 (G02 LCI) Facelift 2021 30i

Largest trunk
525 L
Best overall score
62/100
Best practicality score
76/100

Specification comparison

Specification comparison
Model	BMW4 Series Convertible (G23)430i	BMWX4 (G02 LCI)Facelift 202130i
Power	258hp192kW	245hp183kW
Torque	400Nm295lb-ft	350Nm258lb-ft
Curb weight	1,715kg3,781lb	1,815kg4,001lb
Gross weight	2,200kg4,850lb	2,400kg5,291lb
Top speed	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph Calculated	235 km/h 146 mph
To 99% top speed	88.4s99% target: 257 km/h / 160 mph Calculated	88.5s99% target: 233 km/h / 145 mph Calculated
0-100 km/h	6.2s	6.6s
0-200 km/h	22.9s Calculated	30.0s Calculated
0-60 mph	5.9s Calculated	6.2s Calculated
Fuel consumption	6.4L/100 km36.8mpg US44.1mpg UK	8.5L/100 km27.7mpg US33.2mpg UK
Fuel consumption city	7.8L/100 km30.2mpg US36.2mpg UK	-
Fuel consumption highway	5.6L/100 km42mpg US50.4mpg UK	-
Quarter mile	14.3s Calculated	14.7s Calculated
Power-to-weight	150hp/t112kW/t68hp/1000 lb Calculated	135hp/t101kW/t61hp/1000 lb Calculated
Torque-to-weight	233Nm/t156lb-ft/ton Calculated	193Nm/t129lb-ft/ton Calculated
Estimated range	922km573mi Calculated	765km475mi Calculated
Displacement	1,998cc122cu in	1,998cc122cu in
Length	4,768mm188in	4,751mm187in
Width	1,852mm73in	1,918mm76in
Height	1,384mm54in	1,621mm64in
Wheelbase	2,851mm112in	2,864mm113in
Front track	1,575mm62in	1,620mm64in
Rear track	1,611mm63in	1,666mm66in
Ground clearance	124mm5in	204mm8in
Trunk volume	300L	525L
Max trunk volume	385L	1,430L
Doors	2	5
Seats	4	5
Fuel tank	59L	65L

Performance charts

Use the estimates as comparison hints and verify exact figures before making decisions.

Dyno simulation

Estimated stock-style power and torque curves by engine speed.

BMW 4 Series Convertible (G23) 430iBMW X4 (G02 LCI) Facelift 2021 30iPowerTorque

Dyno simulation data table
Vehicle	Peak power RPM	Peak torque RPM	Max engine speed
BMW4 Series Convertible (G23)430i	5,000-6,500 rpm	1,550-4,400 rpm	6,750 rpm
BMWX4 (G02 LCI)Facelift 202130i	5,000-6,500 rpm	1,560-4,800 rpm	6,750 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
Metric	BMW4 Series Convertible (G23)430i	BMWX4 (G02 LCI)Facelift 202130i
	Acceleration checkpoints
0-60 mph 0-97 km/h	5.9 s	6.2 s
0-100 km/h 0-62 mph	6.2 s	6.6 s
0-200 km/h 0-124 mph	22.9 s	30.0 s
Top speed	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph Likely limited	235 km/h 146 mph
	Drag race simulation
60 ft 18 m	2.3 s	2.3 s
330 ft 101 m	6.2 s	6.3 s
1/8 mile 201 m	9.3 s	9.5 s
1000 ft 305 m	12.0 s	12.3 s
1/4 mile 402 m	14.3 s	14.7 s
Trap speed 1/4 mile 402 m	163 km/h 101 mph	154 km/h 96 mph

Power comparison

Bar comparison chart for Power. Higher is better · hp / kW

Chart data table
Vehicle	Value
BMW4 Series Convertible (G23)430i	258 hp 192 kW
BMWX4 (G02 LCI)Facelift 202130i	245 hp 183 kW

BMW 4 Series Convertible (G23) 430i has 13 hp more than BMW X4 (G02 LCI) Facelift 2021 30i.

The biggest power difference is between BMW X4 (G02 LCI) Facelift 2021 30i and BMW 4 Series Convertible (G23) 430i: 13 hp (10 kW).

Torque comparison

Bar comparison chart for Torque. Higher is better · Nm / lb-ft

Chart data table
Vehicle	Value
BMW4 Series Convertible (G23)430i	400 Nm 295 lb-ft
BMWX4 (G02 LCI)Facelift 202130i	350 Nm 258 lb-ft

Curb weight comparison

Bar comparison chart for Curb weight. Lower is better · kg / lb

Chart data table
Vehicle	Value
BMW4 Series Convertible (G23)430i	1,715 kg 3,781 lb
BMWX4 (G02 LCI)Facelift 202130i	1,815 kg 4,001 lb

Top speed without limiter comparison

Bar comparison chart for Top speed without limiter. Higher is better · km/h / mph

Chart data table
Vehicle	Value
BMW4 Series Convertible (G23)430i	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph
BMWX4 (G02 LCI)Facelift 202130i	235 km/h 146 mph

0-100 km/h comparison

Bar comparison chart for 0-100 km/h. Lower is better · seconds

Chart data table
Vehicle	Value
BMW4 Series Convertible (G23)430i	6.2 s
BMWX4 (G02 LCI)Facelift 202130i	6.6 s

The biggest 0-100 km/h difference is between BMW 4 Series Convertible (G23) 430i and BMW X4 (G02 LCI) Facelift 2021 30i: 0.4 s.

Fuel consumption comparison

Bar comparison chart for Fuel consumption. Lower is better · L/100 km / mpg US / mpg UK

Chart data table
Vehicle	Value
BMW4 Series Convertible (G23)430i	6.4 L/100 km 36.8 mpg US 44.1 mpg UK
BMWX4 (G02 LCI)Facelift 202130i	8.5 L/100 km 27.7 mpg US 33.2 mpg UK

The biggest fuel consumption difference is between BMW 4 Series Convertible (G23) 430i and BMW X4 (G02 LCI) Facelift 2021 30i: 2.1 L/100 km.

Power-to-weight comparison

Bar comparison chart for Power-to-weight. Higher is better · hp/t / kW/t

Chart data table
Vehicle	Value
BMW4 Series Convertible (G23)430i	150 hp/t 112 kW/t 6.6 kg/hp
BMWX4 (G02 LCI)Facelift 202130i	135 hp/t 101 kW/t 7.4 kg/hp

Estimated range comparison

Bar comparison chart for Estimated range. Higher is better · km / mi

Chart data table
Vehicle	Value
BMW4 Series Convertible (G23)430i	922 km 573 mi
BMWX4 (G02 LCI)Facelift 202130i	765 km 475 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
Vehicle	Power	Acceleration	Top speed
BMW4 Series Convertible (G23)430i	258 hp 192 kW	6.2 s	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph
BMWX4 (G02 LCI)Facelift 202130i	245 hp 183 kW	6.6 s	235 km/h 146 mph

Most attractive quadrant

Scatter chart with performance score on the X axis and practicality score on the Y axis.

Vehicle

Performance score

Practicality score

BMW4 Series Convertible (G23)430i

Power	258 hp 192 kW
0-100 km/h	6.2 s
Top speed Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph

Doors/seats	2 doors 4 seats
Trunk	300 L 10.6 cu ft
Length	4,768 mm 187.7 in
Height	1,384 mm 54.5 in

BMWX4 (G02 LCI)Facelift 202130i

Power	245 hp 183 kW
0-100 km/h	6.6 s
Top speed 235 km/h 146 mph

Doors/seats	5 doors 5 seats
Trunk	525 L 18.5 cu ft
Length	4,751 mm 187.0 in
Height	1,621 mm 63.8 in

Performance vs fuel economy

Cars closer to the top-right corner combine stronger performance with better fuel economy scores.

Vehicle

Performance score

Fuel economy score

BMW4 Series Convertible (G23)430i

Power	258 hp 192 kW
0-100 km/h	6.2 s
Top speed Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph

6.4 L/100 km

36.8 mpg US

44.1 mpg UK

BMWX4 (G02 LCI)Facelift 202130i

Power	245 hp 183 kW
0-100 km/h	6.6 s
Top speed 235 km/h 146 mph

8.5 L/100 km

27.7 mpg US

33.2 mpg UK

BMW 4 Series Convertible (G23) 430i is closest to the top-right balance target for performance and fuel economy.

Acceleration vs fuel consumption

Cars closer to the lower-left corner offer a better mix of quick acceleration and low fuel consumption.

Acceleration vs fuel consumption data table
Vehicle	Fuel consumption, L/100 km	0-100 km/h, s
BMW4 Series Convertible (G23)430i	6.4 L/100 km 36.8 mpg US 44.1 mpg UK	6.2 s
BMWX4 (G02 LCI)Facelift 202130i	8.5 L/100 km 27.7 mpg US 33.2 mpg UK	6.6 s

Power-to-weight vs fuel consumption

The shaded area favors higher power-to-weight with lower combined fuel consumption.

Power-to-weight vs fuel consumption data table
Vehicle	Power-to-weight, hp/t	Fuel consumption, L/100 km
BMW4 Series Convertible (G23)430i	150 hp/t 112 kW/t 6.6 kg/hp	6.4 L/100 km 36.8 mpg US 44.1 mpg UK
BMWX4 (G02 LCI)Facelift 202130i	135 hp/t 101 kW/t 7.4 kg/hp	8.5 L/100 km 27.7 mpg US 33.2 mpg UK

Detailed score breakdown

Vehicle

BMW4 Series Convertible (G23)430i

BMWX4 (G02 LCI)Facelift 202130i

Power

258 hp

192 kW

245 hp

183 kW

Torque

400 Nm

295 lb-ft

350 Nm

258 lb-ft

Acceleration

6.2 s

6.6 s

Top speed

Unrestricted

260 km/h162 mph

Restricted

250 km/h155 mph

235 km/h

146 mph

Lightness

1,715 kg

3,781 lb

1,815 kg

4,001 lb

Fuel consumption

6.4 L/100 km

36.8 mpg US

44.1 mpg UK

8.5 L/100 km

27.7 mpg US

33.2 mpg UK

Practicality

Doors/seats	2 doors 4 seats
Trunk	300 L 10.6 cu ft
Length	4,768 mm 187.7 in
Height	1,384 mm 54.5 in

Doors/seats	5 doors 5 seats
Trunk	525 L 18.5 cu ft
Length	4,751 mm 187.0 in
Height	1,621 mm 63.8 in

Range score

922 km

573 mi

765 km

475 mi

Trunk score

300 L

10.6 cu ft

525 L

18.5 cu ft

Power-to-weight score

150 hp/t

112 kW/t

6.6 kg/hp

135 hp/t

101 kW/t

7.4 kg/hp

Overall

Fixed score

Fuel cost and annual usage

Estimate running costs from combined consumption, your annual distance, and the fuel price in your local currency.

Average annual distanceDistance unitFuel price in your local currencyPrice unit

Enter the fuel price in your local currency, for example €/L, $/gal, £/L or any other local currency.

LC = Local Currency

Fuel cost and annual usage
Vehicle	BMW 4 Series Convertible (G23) 430i	BMW X4 (G02 LCI) Facelift 2021 30i
Consumption	6.4 L/100 km36.8 mpg US44.1 mpg UK	8.5 L/100 km27.7 mpg US33.2 mpg UK
Cost / 100 km	11.20 LC100 km	14.88 LC100 km
Cost / 100 mi	18.02 LC100 mi	23.94 LC100 mi
Annual fuel used	960 L254 US gal211 UK gal	1,275 L337 US gal280 UK gal
Annual fuel cost	1,680 LC/year	2,231 LC/year