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A distinctive feature of the 1 Series Convertible is the flared shoulder line which runs parallel to the road. This shoulder line flows from the hood past the A pillar to the trunk lid, forming a surface which encompasses the entire interior, giving the impression of a boat deck.

The view from the rear is influenced by the position of the softtop: with the top lowered, completely concealed in the tail, the look is flat and elegant; the appearance with the top up is broad shouldered. The trunk lid has an integrated spoiler chiseled into the rear end of the car to accentuate the short rear section. On the 135i, an additional lip spoiler provides greater downforce on the rear end at high speeds.

The individual sections within the L-shaped rear taillights give the vehicle a lower, sportier look. Horizontal lights integrated in the rear light clusters offer a homogeneous lighting effect with the help of light-emitting diodes (LEDs). This light design, as found on other BMW models, makes the BMW 1 Series Convertible stand out at night. Also, the Adaptive Brake Lights operating in two stages in relation to brake application force are yet another feature typical of BMW, with the additional benefit of extra safety on the road.

The standard (on the 135i) Adaptive Xenon Headlights (optional on the 128i), complete with integrated cornering lights, make driving in the dark safer than ever. The daytime running light function, in typical BMW style, uses the four corona rings around each headlight to enhance the visibility of the car under normal and "murky" light conditions.

Convertible Interior Features Comfort, Convenience

Two unique BMW 1 Series Convertible features provide increased driver and passenger comfort, thus improving the overall experience regardless of the top's position. The optional Boston leather incorporates BMW's Sun Reflective Technology where pigments worked into the upholstery mitigate the effect of the sun's ultraviolet rays. Excessive heating of the seats and armrest is diminished, especially for darker interior colors. The overall effect can produce surface temperatures some 20 degrees Fahrenheit below a comparable "normal" leather interior.

The standard upholstery is sporty and comfortable Leatherette, which is also the covering on the optional Sport Package's sport seats with enhanced side support (Boston leather can be selected for this package).

The climate-control system in the 1 Series Convertible has an additional convertible mode (compared to the system in the BMW 1 Series Coupe) designed for open-roof conditions. The three standard modes; gentle, medium and intensive, react primarily to interior sensors, while the convertible mode reacts less to interior temperature and more to the exterior temperature and sunlight factors to establish the intensity of the ventilation. Turbulence in the roof-down cabin can be reduced by an available wind deflector which can be affixed to the sides of the vehicle with a few adjustments. The wind deflector allows for conversation at normal sound levels and the ability to enjoy the wide variety of audio and communication offerings which include SIRIUS satellite radio, HD radio, the optional Premium Sound system, and Bluetooth. For simple and straightforward connection of an MP3 player, an auxiliary input jack is standard and a USB port for direct control of an Apple iPod or iPhone media player is available as an option.

The control console for the entertainment and climate-control functions is integrated smoothly and harmoniously into the dashboard through its soft radii and flowing surfaces. With the optional navigation system, the iDrive controller is integrated in the center console, following BMW's characteristic philosophy of full driver control at all times. Galvanized pearl gloss surfaces adorn the interior door handles, the glove compartment handle, the radio's rotary knobs, the knobs of the automatic climate control system, the iDrive controller, and the ornamental trim strips featured on the sport steering wheel.

M-Inspired Design for the M Sport Package

Model year 2009 saw the introduction of a new M Sport Package, which is standard on the 135i and optional on the 128i. Features of the M Sport Package include an Aero kit for reduced lift at speed (standard on 135i), an increased top speed limiter, better brake cooling, and enhanced aesthetics while the Sports Suspension offers higher traction and reduced body roll with unique wheels and performance tires. Unfortunately, the M Sport Package deletes the Air Curtain feature.

On the 135i Convertible, the Sports Suspension also includes a high-performance brake system incorporating 6-piston fixed calipers on the front and 2-piston calipers at the rear. Additionally, the M Sport Package for both models includes BMW Individual high-gloss Shadowline exterior trim, sport seats, and M branded trim components including driver footrest, gearshift knob (for manual transmission), and door sills. Finally, LeMans Blue Metallic exterior paint is available exclusively when the M Sport Package is ordered.

Innovative Aerodynamics: Air Curtains

Consistency between form and function is crucial to engineers at BMW who seek perfect balance of various aerodynamic factors in the wind tunnel. As a result, the new Air Curtain is BMW's latest aerodynamic innovation. Introduced first on the BMW 1 Series M Coupe, the Air Curtain will now be a standard feature on the 128i Convertible. The Air Curtain improves air flow around the front wheel arches with the benefit of significantly reduced turbulence. The 128i Convertible can also be equipped with special Aero Wheels to further enhance the performance of the Air Curtain system.

Safety Equipment Maximized for Convertible Design

The four standard airbags in the 2012 BMW 1 Series Convertible are designed for the optimum protection of the car's occupants. The advanced frontal airbags are activated in stages relative to impact severity while the side airbags integrated into the sides of the front seat backrests reduce the risk of injury at chest, hip and head levels in side impact situations. The BMW 1 Series Convertible also comes with crash-optimized seats with active headrests designed to reduce the risk of neck injury in an impact from the rear.

All seats within the 1 Series Convertible are fitted with three-point inertia-reel seat belts and headrests, with the front seat belts fastened on to the frames of the driver's and front passenger's seats, keeping the belt in an optimum position around the occupant's hips regardless of seat height or fore-aft placement.

Also, the driver's pedals move back automatically with a predetermined amount of deformation in the event of a frontal collision so that the risk of driver foot injury is reduced. And last but not least, the rear seats come standard with LATCH attachments for child seats. The 2012 BMW 1 Series Convertible is equipped with a roll-over sensor, which continually monitors the vertical and horizontal movements of the vehicle. As soon as the sensors register the danger of the vehicle rolling over, two roll bars are extended in fractions of a second from their storage areas behind the rear headrests. Simultaneously, the front-seat-belt tensioners are activated. Further roll-over protection is offered by the optimized stability of the A pillar and windshield frame.

BMW 135i Convertible: Photo Gallery, Review (1/2) and Specifications