BMW 4 Series Convertible 2021– car dimensions: 4768 mm long, 1852 mm wide and 1384 mm high. Unladen weight is 1,790 kg. Braked towing is 1,600 kg.
The cabin has dual-zone automatic climate control, a widescreen curved display with BMW Live Cockpit Professional, and wireless smartphone integration. Standard driver aids cover active cruise control with stop-and-go, park distance control, rear-view camera, automatic emergency braking via Active Guard, active blind-spot detection, and lane-keeping assistance. These make motorway runs and tight parking simple for everyday use.
Boot space is 385 litres with the roof up and drops to 300 litres with the roof down. The 40/20/40 split rear seats and load-through hatch help with longer items.
Braked towing capacity reaches 1600 kg with a 75 kg nose weight. unbraked is 750 kg. Payload is 485 kg. M Sport suspension is standard on this trim. The car handles light trailers for leisure but is not built for heavy work duties.
Front sport seats deliver firm lateral support via adjustable bolsters and multi-way electric adjustment with memory. Three-zone climate control keeps front and rear zones independent. The multi-layer soft top seals tightly for quiet closed-roof travel and pairs with windscreen acoustic glass. Ambient lighting and Vernasca leather create a driver-focused, enveloping cabin suited to open-air runs when the optional air collar is fitted.
2.0-litre mild-hybrid petrol. EPA combined 30 mpg or WLTP combined figures in the 6–8 l/100 km range depending on market.
Condition Based Service monitors oil and components. typical oil interval around 10 000 miles or 12 months.
Euro NCAP five-star rating (2019) and matching ANCAP five-star for 2.0-litre variants.
Standard kit includes dual front, side and head airbags, DSC, ABS, Active Guard with AEB, lane departure warning, tyre-pressure monitor and Intelligent Emergency Call.
The 430i mild-hybrid four-cylinder returns solid real-world economy for a performance convertible, with EPA figures of 27 city / 35 highway / 30 combined and WLTP combined values typically between 6 and 8 l/100 km according to market testing.
Servicing follows BMW’s Condition Based Service system that tracks actual oil condition, mileage and driving style rather than fixed calendars. Oil and filter changes usually fall near 10 000 miles or one year, with cabin filters and other items linked to the same schedule.
Crash protection earns a five-star Euro NCAP score and an identical ANCAP rating for the 2.0-litre models. Standard equipment covers multiple airbags, dynamic stability and traction control, autonomous emergency braking, lane-keeping aids, park-distance sensors and an automatic emergency-call function.
Ownership is supported by a three- or four-year unlimited-mileage warranty depending on market, plus complimentary scheduled maintenance for the first three years or 36 000 miles in many regions. The soft-top mechanism and run-flat tyres require only routine checks.
Length 4768 mm, Width 1852 mm, Height 1384 mm, Wheelbase 2851 mm (4 Series Convertible 2021-present)
Sources: manufacturer data, BMW official technical data pages , BMW press kit specifications 01/2024 , BMW Thailand 2025 brochure.