Car comparison

BMW 1 Series Convertible (E88) 125ivsAlfa Romeo Spider (939) 1.8 TBi

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

New comparison

BMW 1 Series Convertible (E88)

125i

218 hp2996 ccGasolineRWDManualNaturally aspiratedCabriolet / convertible2008-2011

Alfa Romeo Spider (939)

1.8 TBi

200 hp1742 ccGasolineFWDManualTurbochargedCabriolet / convertible2009-2010

Comparison overview

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

BMW 1 Series Convertible (E88) 125i

Quickest 0-100 km/h
6.8 s
Fastest top speed
238 km/h
148 mph
Most powerful
218 hp
163 kW
Best power-to-weight
144 hp/t
108 kW/t
6.9 kg/hp
Lowest combined fuel consumption
8.1 L/100 km
29.0 mpg US
34.9 mpg UK
Lowest city consumption
11.7 L/100 km
20.1 mpg US
24.1 mpg UK
Lowest highway consumption
6.0 L/100 km
39.2 mpg US
47.1 mpg UK
Largest trunk
260 L
Best overall score
50/100
Best performance score
53/100
Best economy score
85/100
Best practicality score
43/100

Alfa Romeo Spider (939) 1.8 TBi

Highest torque
320 Nm
236 lb-ft
Lightest
1,490 kg
3,285 lb
Lowest CO2 emissions
192 g/km
Best estimated range
854 km
530 mi

Specification comparison

Specification comparison
Model	BMW1 Series Convertible (E88)125i	Alfa RomeoSpider (939)1.8 TBi
Power	218hp163kW	200hp149kW
Torque	270Nm199lb-ft	320Nm236lb-ft
Curb weight	1,510kg3,329lb	1,490kg3,285lb
Gross weight	1,950kg4,299lb	1,840kg4,057lb
Top speed	238 km/h 148 mph	235 km/h 146 mph
To 99% top speed	88.3s99% target: 236 km/h / 146 mph Calculated	106.9s99% target: 233 km/h / 145 mph Calculated
0-100 km/h	6.8s	7.8s
0-200 km/h	29.2s Calculated	35.9s Calculated
0-60 mph	6.4s Calculated	7.4s Calculated
Fuel consumption	8.1L/100 km29mpg US34.9mpg UK	8.2L/100 km28.7mpg US34.4mpg UK
Fuel consumption city	11.7L/100 km20.1mpg US24.1mpg UK	11.9L/100 km19.8mpg US23.7mpg UK
Fuel consumption highway	6L/100 km39.2mpg US47.1mpg UK	6.1L/100 km38.6mpg US46.3mpg UK
Quarter mile	14.8s Calculated	15.6s Calculated
Power-to-weight	144hp/t108kW/t65hp/1000 lb Calculated	134hp/t100kW/t61hp/1000 lb Calculated
Torque-to-weight	179Nm/t120lb-ft/ton Calculated	215Nm/t144lb-ft/ton Calculated
Estimated range	654km407mi Calculated	854km530mi Calculated
Displacement	2,996cc183cu in	1,742cc106cu in
Length	4,360mm172in	4,393mm173in
Width	1,748mm69in	1,830mm72in
Height	1,411mm56in	1,318mm52in
Wheelbase	2,660mm105in	2,528mm100in
Front track	1,474mm58in	1,579mm62in
Rear track	1,507mm59in	1,559mm61in
Ground clearance	140mm6in	-
Trunk volume	260L	253L
Max trunk volume	305L	-
Doors	2	2
Seats	4	2
Fuel tank	53L	70L
CO2 emissions	195g/km	192g/km

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 1 Series Convertible (E88) 125iAlfa Romeo Spider (939) 1.8 TBiPowerTorque

Dyno simulation data table
Vehicle	Peak power RPM	Peak torque RPM	Max engine speed
BMW1 Series Convertible (E88)125i	6,100 rpm	2,500-4,250 rpm	6,350 rpm
Alfa RomeoSpider (939)1.8 TBi	5,000 rpm	1,400 rpm	5,250 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
Metric	BMW1 Series Convertible (E88)125i	Alfa RomeoSpider (939)1.8 TBi
	Acceleration checkpoints
0-60 mph 0-97 km/h	6.4 s	7.4 s
0-100 km/h 0-62 mph	6.8 s	7.8 s
0-200 km/h 0-124 mph	29.2 s	35.9 s
Top speed	238 km/h 148 mph	235 km/h 146 mph
	Drag race simulation
60 ft 18 m	2.4 s	2.5 s
330 ft 101 m	6.4 s	6.7 s
1/8 mile 201 m	9.7 s	10.2 s
1000 ft 305 m	12.5 s	13.1 s
1/4 mile 402 m	14.8 s	15.6 s
Trap speed 1/4 mile 402 m	154 km/h 96 mph	146 km/h 91 mph

Power comparison

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

Chart data table
Vehicle	Value
BMW1 Series Convertible (E88)125i	218 hp 163 kW
Alfa RomeoSpider (939)1.8 TBi	200 hp 149 kW

BMW 1 Series Convertible (E88) 125i has 18 hp more than Alfa Romeo Spider (939) 1.8 TBi.

The biggest power difference is between Alfa Romeo Spider (939) 1.8 TBi and BMW 1 Series Convertible (E88) 125i: 18 hp (13 kW).

Torque comparison

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

Chart data table
Vehicle	Value
BMW1 Series Convertible (E88)125i	270 Nm 199 lb-ft
Alfa RomeoSpider (939)1.8 TBi	320 Nm 236 lb-ft

Curb weight comparison

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

Chart data table
Vehicle	Value
BMW1 Series Convertible (E88)125i	1,510 kg 3,329 lb
Alfa RomeoSpider (939)1.8 TBi	1,490 kg 3,285 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
BMW1 Series Convertible (E88)125i	238 km/h 148 mph
Alfa RomeoSpider (939)1.8 TBi	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
BMW1 Series Convertible (E88)125i	6.8 s
Alfa RomeoSpider (939)1.8 TBi	7.8 s

The biggest 0-100 km/h difference is between BMW 1 Series Convertible (E88) 125i and Alfa Romeo Spider (939) 1.8 TBi: 1.0 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
BMW1 Series Convertible (E88)125i	8.1 L/100 km 29.0 mpg US 34.9 mpg UK
Alfa RomeoSpider (939)1.8 TBi	8.2 L/100 km 28.7 mpg US 34.4 mpg UK

Power-to-weight comparison

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

Chart data table
Vehicle	Value
BMW1 Series Convertible (E88)125i	144 hp/t 108 kW/t 6.9 kg/hp
Alfa RomeoSpider (939)1.8 TBi	134 hp/t 100 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
BMW1 Series Convertible (E88)125i	654 km 407 mi
Alfa RomeoSpider (939)1.8 TBi	854 km 530 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
Vehicle	Power	Acceleration	Top speed
BMW1 Series Convertible (E88)125i	218 hp 163 kW	6.8 s	238 km/h 148 mph
Alfa RomeoSpider (939)1.8 TBi	200 hp 149 kW	7.8 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

BMW1 Series Convertible (E88)125i

Power	218 hp 163 kW
0-100 km/h	6.8 s
Top speed 238 km/h 148 mph

Doors/seats	2 doors 4 seats
Trunk	260 L 9.2 cu ft
Length	4,360 mm 171.7 in
Height	1,411 mm 55.6 in

Alfa RomeoSpider (939)1.8 TBi

Power	200 hp 149 kW
0-100 km/h	7.8 s
Top speed 235 km/h 146 mph

Doors/seats	2 doors 2 seats
Trunk	253 L 8.9 cu ft
Length	4,393 mm 173.0 in
Height	1,318 mm 51.9 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

BMW1 Series Convertible (E88)125i

Power	218 hp 163 kW
0-100 km/h	6.8 s
Top speed 238 km/h 148 mph

8.1 L/100 km

29.0 mpg US

34.9 mpg UK

Alfa RomeoSpider (939)1.8 TBi

Power	200 hp 149 kW
0-100 km/h	7.8 s
Top speed 235 km/h 146 mph

8.2 L/100 km

28.7 mpg US

34.4 mpg UK

BMW 1 Series Convertible (E88) 125i 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
BMW1 Series Convertible (E88)125i	8.1 L/100 km 29.0 mpg US 34.9 mpg UK	6.8 s
Alfa RomeoSpider (939)1.8 TBi	8.2 L/100 km 28.7 mpg US 34.4 mpg UK	7.8 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
BMW1 Series Convertible (E88)125i	144 hp/t 108 kW/t 6.9 kg/hp	8.1 L/100 km 29.0 mpg US 34.9 mpg UK
Alfa RomeoSpider (939)1.8 TBi	134 hp/t 100 kW/t 7.5 kg/hp	8.2 L/100 km 28.7 mpg US 34.4 mpg UK

Detailed score breakdown

Vehicle

BMW1 Series Convertible (E88)125i

Alfa RomeoSpider (939)1.8 TBi

Power

218 hp

163 kW

200 hp

149 kW

Torque

270 Nm

199 lb-ft

320 Nm

236 lb-ft

Acceleration

6.8 s

7.8 s

Top speed

238 km/h

148 mph

235 km/h

146 mph

Lightness

1,510 kg

3,329 lb

1,490 kg

3,285 lb

Fuel consumption

8.1 L/100 km

29.0 mpg US

34.9 mpg UK

8.2 L/100 km

28.7 mpg US

34.4 mpg UK

Practicality

Doors/seats	2 doors 4 seats
Trunk	260 L 9.2 cu ft
Length	4,360 mm 171.7 in
Height	1,411 mm 55.6 in

Doors/seats	2 doors 2 seats
Trunk	253 L 8.9 cu ft
Length	4,393 mm 173.0 in
Height	1,318 mm 51.9 in

Range score

654 km

407 mi

854 km

530 mi

CO2 score

195 g/km

192 g/km

Trunk score

260 L

9.2 cu ft

253 L

8.9 cu ft

Power-to-weight score

144 hp/t

108 kW/t

6.9 kg/hp

134 hp/t

100 kW/t

7.5 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 1 Series Convertible (E88) 125i	Alfa Romeo Spider (939) 1.8 TBi
Consumption	8.1 L/100 km29 mpg US34.9 mpg UK	8.2 L/100 km28.7 mpg US34.4 mpg UK
Cost / 100 km	14.17 LC100 km	14.35 LC100 km
Cost / 100 mi	22.81 LC100 mi	23.09 LC100 mi
Annual fuel used	1,215 L321 US gal267 UK gal	1,230 L325 US gal271 UK gal
Annual fuel cost	2,126 LC/year	2,153 LC/year