The Mini Convertible (F57) facelift, specifically the One 1.5 variant producing 102 horsepower, represents an entry point into the third generation of Mini’s open-top model. Introduced in 2018, this version of the F57 aimed to broaden the appeal of the Convertible by offering a more accessible price point and improved fuel efficiency. It slots into the F57 range alongside more powerful Cooper and John Cooper Works models, targeting buyers prioritizing style and open-air driving experience over outright performance. The F57 generation, built on the UKL1 platform shared with other BMW Group vehicles, brought increased size and refinement compared to its predecessors.
Technical Specifications
| Brand | Mini |
| Model | Convertible |
| Generation | Convertible (F57, facelift 2018) |
| Type (Engine) | One 1.5 (102 Hp) |
| Start of production | 2018 |
| End of production | 2018 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Cabriolet |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 6.1-6.2 l/100 km (38.6 – 37.9 US mpg) |
| Fuel consumption (extra urban) | 4.5-4.7 l/100 km (52.3 – 50 US mpg) |
| Fuel consumption (combined) | 5.0-5.2 l/100 km (47 – 45.2 US mpg) |
| CO2 emissions | 115-119 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 | 11.8 kg/Hp |
| Weight-to-torque ratio | 6.3 kg/Nm |
| Power | 102 Hp @ 3900-6500 rpm |
| Torque | 190 Nm @ 1350-3600 rpm (140.14 lb.-ft.) |
| Engine layout | Front, Transverse |
| Engine Model/Code | B38A15A |
| Engine displacement | 1499 cm3 (91.47 cu. in.) |
| Number of cylinders | 3 |
| Engine configuration | Inline |
| Cylinder Bore | 82 mm (3.23 in.) |
| Piston Stroke | 94.6 mm (3.72 in.) |
| Compression ratio | 11:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Twin-power turbo, Intercooler |
| Engine oil capacity | 4.5 l (4.76 US qt | 3.96 UK qt) |
| Coolant | 5.7 l (6.02 US qt | 5.02 UK qt) |
| Kerb Weight | 1205 kg (2656.57 lbs.) |
| Max. weight | 1670 kg (3681.72 lbs.) |
| Max load | 465 kg (1025.15 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 |
| Gearbox type | 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 One 1.5 Convertible is the BMW B38A15A engine, a 1.5-liter turbocharged three-cylinder petrol engine. This engine is part of BMW’s modular engine family, known for its compact size and efficiency. It utilizes direct fuel injection and a single twin-scroll turbocharger to deliver 102 horsepower and 190 Nm (140 lb-ft) of torque. The turbocharger design helps to minimize turbo lag, providing a relatively responsive driving experience. The engine features an aluminum block and head, contributing to its lightweight construction. The F57 One 1.5 typically came equipped with a six-speed manual transmission, although a six-speed automatic option was also available. The automatic transmission is a conventional torque-converter type, prioritizing smooth shifts over outright performance.
Driving Characteristics
The 1.5-liter engine in the One Convertible provides adequate, but not exhilarating, performance. Acceleration from 0-60 mph takes around 10.1 seconds, and the top speed is 118 mph. The engine feels most comfortable in the mid-range, with usable torque available from around 1350 rpm. However, it can feel strained when pushed hard, particularly when fully loaded or climbing hills. Compared to the more powerful Cooper models, the One 1.5 offers a more relaxed driving experience, prioritizing fuel economy and ease of use. The manual transmission provides a more engaging driving experience, while the automatic offers convenience in urban environments. The gear ratios are tuned for efficiency, rather than outright acceleration.
Equipment & Trim Levels
The One 1.5 Convertible typically came with a relatively basic level of equipment, positioning it as the entry-level model. Standard features included air conditioning, power windows, central locking, and a basic audio system. Interior upholstery was typically cloth, with options for leather upgrades. The dashboard layout is characteristic of the F57 generation, featuring a centrally mounted infotainment screen and a distinctive circular instrument cluster. Optional extras included navigation, upgraded audio systems, heated seats, and various styling packages. The Convertible-specific features, such as the fully automatic fabric roof, were standard on all F57 models.
Chassis & Braking
The F57 Convertible utilizes a McPherson strut front suspension and a multi-link rear suspension. This setup provides a good balance between ride comfort and handling. The suspension is tuned to be relatively soft, prioritizing comfort over sporty handling. The front brakes are ventilated discs, while the rear brakes are solid discs. ABS (Anti-lock Braking System) is standard. The steering is electric power-assisted, providing light and precise steering feel. The chassis is reinforced compared to the standard Mini hatchback to compensate for the lack of a fixed roof, maintaining structural rigidity.
Market Reception & Comparison
The One 1.5 Convertible was generally well-received by critics as an affordable and stylish entry point into the Mini Convertible range. However, some reviewers noted that the engine lacked the punch of the more powerful Cooper models. Fuel economy was praised, with combined figures ranging from 47 to 45.2 US mpg. Compared to the Cooper models, the One 1.5 offered lower running costs but a less engaging driving experience. Reliability has been generally good, with the B38 engine proving to be a robust unit. However, as with any convertible, potential buyers should be aware of the possibility of water leaks and wear and tear on the fabric roof.
Legacy
The One 1.5 Convertible remains a popular choice in the used car market, particularly for buyers seeking a stylish and affordable open-top car. The B38 engine has proven to be relatively reliable, although regular maintenance is essential. The availability of parts and servicing is good, thanks to the Mini’s widespread popularity. While not the fastest or most luxurious convertible on the market, the One 1.5 offers a unique blend of style, affordability, and open-air driving enjoyment, making it a compelling option for those seeking a fun and fashionable car.
