The Mini Convertible (F57) One 1.2, produced from 2016 to 2018, represents the entry point into the third generation of Mini’s open-top model. Positioned within the F57 chassis code generation – sharing its platform with the Mini 3-Door Hatch (F56) – the One 1.2 offered a more accessible price point and focused on fuel efficiency rather than outright performance. It catered to buyers seeking the iconic Mini style and open-air driving experience without the higher costs associated with more powerful variants like the Cooper or Cooper S. This model aimed to broaden the Convertible’s appeal, attracting a wider demographic to the Mini brand.
Technical Specifications
| Brand | Mini |
| Model | Convertible |
| Generation | Convertible (F57) |
| Type (Engine) | One 1.2 (102 Hp) |
| Start of production | 2016 |
| End of production | 2018 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Cabriolet |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 6.0-5.9 l/100 km (39.2 – 39.9 US mpg) |
| Fuel consumption (extra urban) | 4.6-4.4 l/100 km (51.1 – 53.5 US mpg) |
| Fuel consumption (combined) | 5.2-5.0 l/100 km (45.2 – 47 US mpg) |
| CO2 emissions | 120-116 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 10.6 sec |
| Acceleration 0 – 62 mph | 10.6 sec |
| Acceleration 0 – 60 mph | 10.1 sec |
| Maximum speed | 190 km/h (118.06 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 11.1 kg/Hp |
| Weight-to-torque ratio | 6.3 kg/Nm |
| Power | 102 Hp @ 4000-6000 rpm |
| Torque | 180 Nm @ 1400-3900 rpm (132.76 lb.-ft.) |
| Engine layout | Front, Transverse |
| Engine Model/Code | B38A12A |
| Engine displacement | 1198 cm3 (73.11 cu. in.) |
| Number of cylinders | 3 |
| Engine configuration | Inline |
| Cylinder Bore | 78 mm (3.07 in.) |
| Piston Stroke | 83.6 mm (3.29 in.) |
| Compression ratio | 10.2:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Twin-power turbo, Intercooler |
| Engine oil capacity | 4.25 l (4.49 US qt | 3.74 UK qt) |
| Coolant | 4.9 l (5.18 US qt | 4.31 UK qt) |
| Kerb Weight | 1130 kg (2491.22 lbs.) |
| Max. weight | 1670 kg (3681.72 lbs.) |
| Max load | 540 kg (1190.5 lbs.) |
| Trunk (boot) space – minimum | 160 l (5.65 cu. ft.) |
| Trunk (boot) space – maximum | 215 l (7.59 cu. ft.) |
| Fuel tank capacity | 40 l (10.57 US gal | 8.8 UK gal) |
| Length | 3821 mm (150.43 in.) |
| Width | 1727 mm (67.99 in.) |
| Height | 1415 mm (55.71 in.) |
| Wheelbase | 2495 mm (98.23 in.) |
| Front track | 1501 mm (59.09 in.) |
| Rear (Back) track | 1501 mm (59.09 in.) |
| Ride height (ground clearance) | 115 mm (4.53 in.) |
| Drag coefficient (Cd) | 0.34 |
| Minimum turning circle | 10.8 m (35.43 ft.) |
| Drivetrain Architecture | Front wheel drive |
| Number of gears | 6 |
| Type of gearbox | Manual transmission |
| Front suspension | Independent, type McPherson with coil spring and anti-roll bar |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 175/65 R15 84H |
| Wheel rims size | 5.5J x 15 |
Powertrain & Engine Architecture
The heart of the F57 One 1.2 is the BMW-developed B38A12A 1.2-liter three-cylinder turbocharged engine. This engine is a key component of BMW Group’s modular engine family, known for its efficiency and surprisingly robust power output for its size. It utilizes direct fuel injection, delivering fuel directly into the combustion chamber for improved efficiency and reduced emissions. The engine also features a single twin-scroll turbocharger with an intercooler, which minimizes turbo lag and provides a broader torque curve. The valvetrain employs BMW’s VALVETRONIC technology, a fully variable valve lift system that optimizes engine breathing for improved fuel economy and responsiveness. The engine is transversely mounted at the front of the vehicle. The standard transmission for this variant was a six-speed manual gearbox, although a six-speed automatic transmission was also available as an option. The automatic transmission, while offering convenience, was generally considered less engaging than the manual.
Driving Characteristics
The 102 horsepower and 180 Nm (133 lb-ft) of torque produced by the 1.2-liter engine provided adequate, but not exhilarating, performance. Acceleration from 0-60 mph took around 10.1 seconds, and the top speed was 118 mph. In real-world driving, the One 1.2 felt best suited for urban and suburban environments. The turbocharger provided a noticeable boost in power, but the engine lacked the outright punch of the Cooper or Cooper S models. The six-speed manual transmission offered a more connected driving experience, while the automatic, though smooth, could feel somewhat hesitant during quick acceleration. The gear ratios were tuned for fuel efficiency, meaning the engine often needed to be revved to access its full potential. Compared to the more powerful variants, the One 1.2 prioritized fuel economy and ease of driving over sporty performance.
Equipment & Trim Levels
The One 1.2 Convertible typically came with a reasonable level of standard equipment. This included air conditioning, power windows, central locking, and a basic audio system with USB connectivity. Interior upholstery was typically cloth, with a relatively simple dashboard layout. Optional extras included leather upholstery, a more advanced infotainment system with navigation, park distance control, and a wind deflector to reduce turbulence in the cabin when the roof was down. The One 1.2 served as the entry-level trim, meaning it lacked some of the more premium features found on the Cooper and Cooper S models, such as sport seats, upgraded audio systems, and more extensive customization options.
Chassis & Braking
The F57 Convertible utilized a McPherson strut front suspension and a multi-link rear suspension, providing a comfortable and reasonably controlled ride. The front brakes were ventilated discs, while the rear brakes were solid discs. ABS (Anti-lock Braking System) was standard. Given the lower power output and weight of the One 1.2, the braking system was generally adequate for its intended use. The suspension was tuned for comfort rather than outright sportiness, prioritizing a smooth ride over sharp handling. Stabilizer bars were fitted front and rear, but were typically smaller in diameter compared to those found on the higher-performance models.
Market Reception & Comparison
Critics generally praised the F57 One 1.2 for its fuel efficiency and affordability, but noted its lack of outright performance. It was seen as a good option for buyers who prioritized style and open-air driving over sporty handling. Compared to the Cooper and Cooper S models, the One 1.2 offered significantly better fuel economy, but at the expense of acceleration and overall driving excitement. The automatic transmission received mixed reviews, with some testers finding it sluggish and unresponsive. Reliability was generally good, with the B38 engine proving to be a robust and dependable unit.
Legacy
The Mini Convertible (F57) One 1.2 remains a relatively affordable entry point into Mini ownership on the used car market. The B38 engine has proven to be a reliable powertrain, although regular maintenance is crucial. Common issues include occasional oil leaks and potential problems with the turbocharger, particularly if the engine has not been properly maintained. The One 1.2’s focus on fuel efficiency and practicality has made it a popular choice for urban commuters and drivers seeking a stylish and economical convertible. While it may not offer the same level of performance as its more powerful siblings, it provides a unique and enjoyable driving experience that embodies the spirit of the Mini brand.
