2008 BMW 135i Convertible Road Test Specs | Edmunds

2008 BMW 1 Series - Road Test Specs

2008 BMW 1 Series Convertible

(3.0L 6-cyl. Twin-turbo 6-speed Manual)


Model year2008
Base MSRP$39,100
Options on test vehicleSparkling Graphic Metallic Paint ($475); Coral Red Boston Leather ($1,450); Sport Package ($1,000 -- includes 18-inch wheels with performance tires, sport seats, M steering wheel, Shadowline trim); Comfort Access System ($500); iPod/USB Adapter ($400); BMW Assist ($750).
As-tested MSRP$44,450


Drive typeRear-wheel drive
Engine typeTurbo 3.0L inline-6
Displacement (cc/cu-in)2,973cc (181.3 cu-in)
Block/head materialAluminum/magnesium
Valvetrain24 valves, double-overhead cam
Compression ratio (x:1)10.2
Redline (rpm)7,000
Horsepower (hp @ rpm)300 @ 5,800
Torque (lb-ft @ rpm)300 @ 1,400
Transmission typeManual 6-speed
Transmission and axle ratios (x:1)I = 4.055, II = 2.396, III = 1.582, IV = 1.192, V = 1, VI = 0.872, R = 3.677, Final Drive = 3.077


Suspension, frontAluminum double-pivot
Suspension, rearFive-link fully independent in lightweight steel
Steering typeRack-and-pinion
Steering ratio (x:1)16:01
Tire brandBridgestone
Tire modelPolenza RE050A
Tire typePerformance
Tire size, front215/40R18 85Y
Tire size, rear245/35R18 88X
Wheel size18 by 7.5 front -- 18 by 8.5 rear
Wheel materialLight alloy
Brakes, frontVentilated disc
Brakes, rearVentilated disc

Track Test Results

0-45 mph (sec.)3.7
0-60 mph (sec.)5.5
0-75 mph (sec.)8.2
1/4-mile (sec. @ mph)13.8 @ 101.3
0-60 with 1 foot of rollout (sec.)5.2
Braking, 30-0 mph (ft.)26
60-0 mph (ft.)107
Slalom, 6 x 100 ft. (mph)68.6
Skid pad, 200-ft. diameter (lateral g)0.85
Sound level @ idle (dB)66.5
@ Full throttle (dB)77.3
@ 70 mph cruise (dB)68.7

Test Driver Ratings & Comments

Acceleration comments4,700-5,000 rpm launch speed. Best technique: Clutch out fast (no slip). Very little wheel spin required. Very easy to launch.
Braking ratingVery Good
Braking commentsSolid, consistent pedal feel. Immediate effectiveness. The same brake performance we've come to expect from BMW.
Handling ratingVery Good
Handling commentsSkid pad: Different balance left to right. CCW feels more adjustable. CW is heavy understeer. Overall, good grip. Slalom: Not as stiff or as well damped or as easy to control at limit as 1 Series coupe -- all to be expected from convertible. Still, quite well-mannered despite compromise to structure and weight.

Testing Conditions

Elevation (ft.)Not available
Temperature (°F)77.4
Wind (mph, direction)Not available

Fuel Consumption

EPA fuel economy (mpg)17 city/26 highway
Edmunds observed (mpg)17.2
Fuel tank capacity (U.S. gal.)14

Dimensions & Capacities

Curb weight, mfr. claim (lbs.)3,660
Curb weight, as tested (lbs.)3,686
Weight distribution, as tested, f/r (%)49.7/50.3
Length (in.)171.7
Width (in.)68.8
Height (in.)55.6
Wheelbase (in.)104.7
Track, front (in.)58
Track, rear (in.)59.3
Turning circle (ft.)35.1
Legroom, front (in.)41.2
Legroom, rear (in.)31.3
Legroom, 3rd row (in.)Not available
Headroom, front (in.)38.6
Headroom, rear (in.)37
Headroom, 3rd row (in.)Not available
Shoulder room, front (in.)56
Shoulder room, rear (in.)43
Shoulder room, 3rd row (in.)Not available
Seating capacity4
Cargo volume (cu-ft)8
Max. cargo volume, seats folded (cu-ft)Not available


Bumper-to-bumper4 years/50,000 miles
Powertrain4 years/50,000 miles
Corrosion12 years/Unlimited miles
Roadside assistance4 years/Unlimited miles
Free scheduled maintenance4 years/50,000 miles


Front airbagsStandard
Side airbagsStandard dual front
Head airbagsStandard
Knee airbagsNot available
Antilock brakes4-wheel ABS
Traction controlStandard
Stability controlStandard
Rollover protectionStandard
Tire-pressure monitoring systemStandard
Emergency assistance systemNot available
NHTSA crash test, driverNot tested
NHTSA crash test, passengerNot tested
NHTSA crash test, side frontNot tested
NHTSA crash test, side rearNot tested
NHTSA rollover resistanceNot tested

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