The BMW 135 is a vehicle in BMW’s 1-Series lineup of performance compact cars. 1-Series vehicles were introduced in 2004 and are still in production as of the 2014 model year. BMW 1-Series cars have been available as two-door coupes, two-door convertibles, and hatchbacks in both three-door and five-door configuration. The 1-Series is a front-engine, rear-wheel-drive vehicle, and is the only compact rear-wheel-drive vehicle that is currently exported to North America from a European brand. The 135i trim and 135is trim are available in coupe and convertible versions (and so is the 128 trim). The BMW 135is is new for the 2013 model year. The lineup, including the BMW 135i  and 135is coupe and convertible models, is assembled at BMW production facilities in Lipzig and Regensburg, Germany. 

The BMW 135i and 135is are nearly indistinguishable from one another, at least until the drivetrains are considered. The 135i gets a turbocharged inline-6 that yields 300 horsepower, and paired to the standard manual transmission, a 135i coupe can achieve a 0-60 acceleration time of 5 seconds, while a 135i convertible takes just 5.5 seconds. The manual transmission 135i earned Environmental Protection Agency fuel economy ratings of 20 miles per gallon city, 28 miles per gallon highway, and 23 miles per gallon combined. The convertible’s ratings are 19, 28, and 22 miles per gallon, respectively. The 135is features a tuned version of the same engine that boosts horsepower output to 320. The drivetrain choices can be completed with a six-speed manual, six-speed automatic, or seven-speed dual-clutch automated manual transmission. On the 135is, the automatic transmission option includes paddle shifters mounted on the steering wheel. 

Standard features for the BMW 135i include a sport-optimized suspension, 18-inch wheels, eight-way adjustable power front seats, fog lights, cruise control, an adjustable steering wheel, dual zone automatic climate control, rain-sensing windshield wipers, an aerodynamic body kit, xenon headlights, and a premium audio system that features ten speakers, a CD player, HD radio, USB and iPod integration, and an auxiliary input jack. The coupe also gets a little fresh air from the top thanks to a sunroof, and convertible buyers can opt for sun-reflective leather to keep the seats comfortable with the top down. The 135is trim level gets sportier front seats, a sport steering wheel, and exclusive exterior and interior trim accents. A premium option package adds keyless entry and ignition, ambient cabin lighting, satellite radio, leather upholstery, and auto-dimming mirrors. Heated front seats and a heated steering wheel can be added with the cold weather package. A technology package adds smartphone integration, navigation, voice commands, BMW Apps and BMW Assist. And upgrading from a 135i to a 135i M Sport package essentially nets the features of a 135is, except without the more powerful engine. A la carte package options include a rear parking sensor system, BMW Assist, an audio upgrade to a Harman Kardon surround sound system, variable ratio active steering, and automatic high beams. Safety equipment includes anti-lock brakes with brake drying, traction control, stability control, and hill-start assist for manual transmission cars. The convertible gets pop-up roll hoops and convertible-specific front-seat side airbags. The coupe is fitted with front-seat side airbags and full side curtain airbags.