Car comparison

BMW 1 Series Convertible (E88) 125ivsAlfa Romeo Spider (939) 2.4 JTDM

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
VS

Alfa Romeo Spider (939)

2.4 JTDM

210 hp2387 ccDieselFWDManualTurbochargedCabriolet / convertible2008-2010

Comparison overview

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

Best choices

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
  • Lightest
    1,510 kg
    3,329 lb
  • Best power-to-weight
    144 hp/t
    108 kW/t
    6.9 kg/hp
  • Largest trunk
    260 L
  • Best overall score
    50/100
  • Best performance score
    53/100
  • Best practicality score
    43/100

Alfa Romeo Spider (939) 2.4 JTDM

  • Highest torque
    400 Nm
    295 lb-ft
  • Lowest combined fuel consumption
    6.8 L/100 km
    34.6 mpg US
    41.5 mpg UK
  • Lowest city consumption
    9.2 L/100 km
    25.6 mpg US
    30.7 mpg UK
  • Lowest highway consumption
    5.4 L/100 km
    43.6 mpg US
    52.3 mpg UK
  • Lowest CO2 emissions
    179 g/km
  • Best estimated range
    1,029 km
    640 mi
  • Best economy score
    89/100

Specification comparison

Specification comparison
ModelBMW1 Series Convertible (E88)125iAlfa RomeoSpider (939)2.4 JTDM
Power
218hp163kW
210hp157kW
Torque
270Nm199lb-ft
400Nm295lb-ft
Curb weight
1,510kg3,329lb
1,635kg3,605lb
Gross weight
1,950kg4,299lb
1,985kg4,376lb
Top speed
238 km/h
148 mph
231 km/h
144 mph
To 99% top speed
88.3s99% target: 236 km/h / 146 mph
Calculated
110.5s99% target: 229 km/h / 142 mph
Calculated
0-100 km/h
6.8s
8.1s
0-200 km/h
29.2s
Calculated
39.3s
Calculated
0-60 mph
6.4s
Calculated
7.6s
Calculated
Fuel consumption
8.1L/100 km29mpg US34.9mpg UK
6.8L/100 km34.6mpg US41.5mpg UK
Fuel consumption city
11.7L/100 km20.1mpg US24.1mpg UK
9.2L/100 km25.6mpg US30.7mpg UK
Fuel consumption highway
6L/100 km39.2mpg US47.1mpg UK
5.4L/100 km43.6mpg US52.3mpg UK
Quarter mile
14.8s
Calculated
15.9s
Calculated
Power-to-weight
144hp/t108kW/t65hp/1000 lb
Calculated
128hp/t96kW/t58hp/1000 lb
Calculated
Torque-to-weight
179Nm/t120lb-ft/ton
Calculated
245Nm/t164lb-ft/ton
Calculated
Estimated range
654km407mi
Calculated
1,029km640mi
Calculated
Displacement
2,996cc183cu in
2,387cc146cu 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
179g/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) 2.4 JTDMPowerTorque
  • BMW 1 Series Convertible (E88) 125i: Power / Torque
  • Alfa Romeo Spider (939) 2.4 JTDM: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
BMW1 Series Convertible (E88)125i6,100 rpm2,500-4,250 rpm6,350 rpm
Alfa RomeoSpider (939)2.4 JTDM4,000 rpm1,500 rpm4,250 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricBMW1 Series Convertible (E88)125iAlfa RomeoSpider (939)2.4 JTDM
Acceleration checkpoints
0-60 mph
0-97 km/h
6.4 s
7.6 s
0-100 km/h
0-62 mph
6.8 s
8.1 s
0-200 km/h
0-124 mph
29.2 s
39.3 s
Top speed
238 km/h
148 mph
231 km/h
144 mph
Drag race simulation
60 ft
18 m
2.4 s
2.5 s
330 ft
101 m
6.4 s
6.8 s
1/8 mile
201 m
9.7 s
10.3 s
1000 ft
305 m
12.5 s
13.3 s
1/4 mile
402 m
14.8 s
15.9 s
Trap speed
1/4 mile
402 m
154 km/h
96 mph
144 km/h
89 mph

Power comparison

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

Chart data table
VehicleValue
BMW1 Series Convertible (E88)125i
218 hp
163 kW
Alfa RomeoSpider (939)2.4 JTDM
210 hp
157 kW

BMW 1 Series Convertible (E88) 125i has 8 hp more than Alfa Romeo Spider (939) 2.4 JTDM.

The biggest power difference is between Alfa Romeo Spider (939) 2.4 JTDM and BMW 1 Series Convertible (E88) 125i: 8 hp (6 kW).

Torque comparison

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

Chart data table
VehicleValue
BMW1 Series Convertible (E88)125i
270 Nm
199 lb-ft
Alfa RomeoSpider (939)2.4 JTDM
400 Nm
295 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
BMW1 Series Convertible (E88)125i
1,510 kg
3,329 lb
Alfa RomeoSpider (939)2.4 JTDM
1,635 kg
3,605 lb

Top speed without limiter comparison

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

Chart data table
VehicleValue
BMW1 Series Convertible (E88)125i
238 km/h
148 mph
Alfa RomeoSpider (939)2.4 JTDM
231 km/h
144 mph

0-100 km/h comparison

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

Chart data table
VehicleValue
BMW1 Series Convertible (E88)125i6.8 s
Alfa RomeoSpider (939)2.4 JTDM8.1 s

The biggest 0-100 km/h difference is between BMW 1 Series Convertible (E88) 125i and Alfa Romeo Spider (939) 2.4 JTDM: 1.3 s.

Fuel consumption comparison

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

Chart data table
VehicleValue
BMW1 Series Convertible (E88)125i
8.1 L/100 km
29.0 mpg US
34.9 mpg UK
Alfa RomeoSpider (939)2.4 JTDM
6.8 L/100 km
34.6 mpg US
41.5 mpg UK

The biggest fuel consumption difference is between Alfa Romeo Spider (939) 2.4 JTDM and BMW 1 Series Convertible (E88) 125i: 1.3 L/100 km.

Power-to-weight comparison

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

Chart data table
VehicleValue
BMW1 Series Convertible (E88)125i
144 hp/t
108 kW/t
6.9 kg/hp
Alfa RomeoSpider (939)2.4 JTDM
128 hp/t
96 kW/t
7.8 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
BMW1 Series Convertible (E88)125i
654 km
407 mi
Alfa RomeoSpider (939)2.4 JTDM
1,029 km
640 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
BMW1 Series Convertible (E88)125i
218 hp
163 kW
6.8 s
238 km/h
148 mph
Alfa RomeoSpider (939)2.4 JTDM
210 hp
157 kW
8.1 s
231 km/h
144 mph

Most attractive quadrant

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

Chart data table
VehiclePerformance scorePracticality score
BMW1 Series Convertible (E88)125i
Power
218 hp
163 kW
0-100 km/h6.8 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)2.4 JTDM
Power
210 hp
157 kW
0-100 km/h8.1 s
Top speed
231 km/h
144 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.

Performance vs fuel economy data table
VehiclePerformance scoreFuel economy score
BMW1 Series Convertible (E88)125i
Power
218 hp
163 kW
0-100 km/h6.8 s
Top speed
238 km/h
148 mph
8.1 L/100 km
29.0 mpg US
34.9 mpg UK
Alfa RomeoSpider (939)2.4 JTDM
Power
210 hp
157 kW
0-100 km/h8.1 s
Top speed
231 km/h
144 mph
6.8 L/100 km
34.6 mpg US
41.5 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
VehicleFuel consumption, L/100 km0-100 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)2.4 JTDM
6.8 L/100 km
34.6 mpg US
41.5 mpg UK
8.1 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
VehiclePower-to-weight, hp/tFuel 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)2.4 JTDM
128 hp/t
96 kW/t
7.8 kg/hp
6.8 L/100 km
34.6 mpg US
41.5 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleBMW1 Series Convertible (E88)125iAlfa RomeoSpider (939)2.4 JTDM
Power
218 hp
163 kW
210 hp
157 kW
Torque
270 Nm
199 lb-ft
400 Nm
295 lb-ft
Acceleration
6.8 s
8.1 s
Top speed
238 km/h
148 mph
231 km/h
144 mph
Lightness
1,510 kg
3,329 lb
1,635 kg
3,605 lb
Fuel consumption
8.1 L/100 km
29.0 mpg US
34.9 mpg UK
6.8 L/100 km
34.6 mpg US
41.5 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
1,029 km
640 mi
CO2 score
195 g/km
179 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
128 hp/t
96 kW/t
7.8 kg/hp
Overall
Fixed score
Fixed score

Fuel cost and annual usage

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

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
VehicleBMW 1 Series Convertible (E88) 125iAlfa Romeo Spider (939) 2.4 JTDM
Consumption8.1 L/100 km29 mpg US34.9 mpg UK6.8 L/100 km34.6 mpg US41.5 mpg UK
Cost / 100 km14.17 LC100 km11.90 LC100 km
Cost / 100 mi22.81 LC100 mi19.15 LC100 mi
Annual fuel used1,215 L321 US gal267 UK gal1,020 L269 US gal224 UK gal
Annual fuel cost2,126 LC/year1,785 LC/year

Head-to-head comparisons

BMW 1 Series Convertible (E88) 125i

  • Has 8 hp more
  • Is 125 kg lighter
  • Is 1.3 s quicker from 0-100 km/h
  • Has 7 km/h (4 mph) higher top speed
  • Has 16 hp/t better power-to-weight
  • Has 7 L more trunk volume

Pros

  • Quickest 0-100 km/h in this comparison
  • Highest top speed
  • Most powerful
  • Lightest
  • Best power-to-weight ratio
  • Largest trunk

Cons

  • Highest combined fuel consumption
  • Highest CO2 emissions

Alfa Romeo Spider (939) 2.4 JTDM

  • Has 130 Nm more
  • Uses 1.3 L/100 km less fuel
  • Has 375 km (233 mi) more estimated range
  • Emits 16 g/km less CO2

Pros

  • Highest torque
  • Lowest combined fuel consumption
  • Best estimated range

Cons

  • Slowest 0-100 km/h
  • Lowest power
  • Heaviest
  • Lowest top speed
  • Smallest trunk

Choose cars to compare

Brand
Model
Generation
Engine or modification
BMW 1 Series Convertible (E88) 125i
Alfa Romeo Spider (939) 2.4 JTDM
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2 vehicles selected

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