The BMW 1 Series (E81/E87 and E82/E88 models) is a small family car produced by the German automaker BMW since 2004. The 1 Series is unusual in its class as it features rear-wheel drive, 50:50 weight balance, a longitudinally-mounted engine and an advanced aluminum multilink suspension. It is currently BMW's second best-selling automobile worldwide, accounting for nearly one-fifth of the total sales in 2008.

The 1 Series was launched globally in Autumn 2004 and shares many structural, chassis, powertrain, hardware and electronic elements with the larger 3 Series. The model was started to provide a lower point of entry into the BMW range as the 3 Series moved gradually up-market. Initially launched as a five-door hatchback, a three-door version was also launched in July 2007. The 1 Series is priced between the MINI and the current E90 3 Series. Because the coupe is the only rear wheel drive vehicle in its class, it is often considered^[who?] the successor to the BMW 2002.

The 1 Series coupe (E82) and convertible (E88) went on sale in the United States and Canada in model year 2008 (30 June 2007) as the 128i and the 135i. Other countries received the 120i and 125i in both platforms. The convertible, unlike the 3 Series convertible, uses a soft-top instead of a folding hardtop. This is lighter, cheaper to manufacture and preserves more trunk space than the folding hardtop would allow.

For the current-generation M Coupe, see BMW 1 Series M Coupe

The BMW M Coupe is a Shooting-brake styled high-performance automobile produced by BMW. As of February 2009, two generations of the M Coupe have been manufactured, one based on the E36/8 Z3 Coupe and the second off of the E86 Z4 Coupe. Both generations have a "sister" Convertible/Roadster model available. Though a second generation E89 Z4 has been released for the 2009 model year, no official announcements have been made regarding the third iteration of the BMW M Coupe/Roadster.

The car is based on the BMW M Roadster. The semi-trailing arm rear suspension was not modified from the M Roadster. The coupe is 2.7 times stiffer than its convertible counterpart, resulting in superior handling.

The M coupe was developed under the leadership of engineer Burkhard Göschel with the intention of adding increased torsional and structural rigidity to the Z3 roadster’s chassis. The development team had a hard time convincing the Board of Directors to approve the model for production, but it was eventually given the green light as long as it remained cost-effective to produce. To achieve this goal, as many body panels as possible had to be shared with the roadster, thus the doors and everything from the A-pillar forward are interchangeable between the coupe and roadster, as are most interior parts. The Z3 coupe, which mates the M coupe's body with the standard Z3 drivetrain, chassis and cosmetics was approved for production at the same time.

The BMW 1 Series is a line of small family cars manufactured by the German automaker BMW since 2004. Successor to the BMW Compact, it has been produced in four different body styles.

There are two generations of the 1 Series and their respective chassis codes:

The 1 Series was launched globally in Autumn 2004 and shares many structural, chassis, powertrain, hardware and electronic elements with the larger 3 Series. The model was started to provide a lower point of entry into the BMW range as the 3 Series moved gradually up-market. Initially launched as a 5-door hatchback, a 2-door coupe version was also launched in July 2007, followed by a convertible, 3-door hatchback and a facelifted 5-door hatchback. The 1 Series is priced between the MINI and the current E90 3 Series. The hatchback is the only rear wheel drive vehicle in its class, so it is often considered the successor to the BMW 2002. The 1 Series line is produced in two BMW factories in Germany based in Leipzig and Regensburg.

The 1 Series coupe (E82) and convertible (E88) went on sale in the United States and Canada in model year 2008 (30 June 2007) as the 128i and the 135i. Other countries received the 120i, 125i and the 135i in both platforms. The convertible, unlike the 3 Series convertible, uses a soft-top instead of a folding hardtop. This is lighter and preserves more boot space than the folding hardtop would allow.