BMW
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BMW
The 840i Convertible (body code G14) is the rear-wheel-drive, six-cylinder cabriolet of BMW's second-generation 8 Series, a large CLAR-platform grand tourer positioned beneath the V8 M850i and the M8. Its turbocharged 3.0-liter B58 inline-six drives the rear wheels through a ZF eight-speed Steptronic automatic; in the 2024 facelift form sold for 2025 it makes 250 kW (340 PS / 335 hp) and 500 N·m (369 lb-ft), good for a factory 0-100 km/h time of 5.2 seconds and an electronically limited 155 mph. The fabric folding roof and additional bracing make the convertible the heaviest non-M 8 Series body style at roughly 1,990 kg. BMW withdrew the 8 Series after the 2025 model year, making this one of the final years of the open four-seat grand tourer.
Each figure carries an evidence mark and a text label; expand a value for its full provenance — citation, verification, test conditions, and any alternate figures.
Originally reported as 5.2 s; stored canonically.
BMW factory claim for the 2024 facelift 840i RWD Convertible (5.3 s pre-facelift; the xDrive Convertible is 4.9 s). Read on the German Wikipedia G15 body-style-specific acceleration table (Cabriolet row).
The headline numbers for the 2025 BMW 840i Convertible, answered straight from its sourced record.
Cars in the same class at a comparable price and performance — each figure sourced. Open a head-to-head to weigh the numbers side by side.
Originally reported as 5 s; stored canonically.
BMW official US launch material for the G14 840i Convertible lists 0-60 mph in 5.0 s; same powertrain carried through the seeded 2025 variant.
Originally reported as 1345 mm; stored canonically.
Height 1,345 mm for the 2024 facelift G14 Cabriolet (1,339 mm pre-facelift). Read on the German Wikipedia G15 dimensions table (Cabriolet row).
Originally reported as 4851 mm; stored canonically.
Overall length 4,851 mm for the 2024 facelift G14 Cabriolet (the pre-facelift body was 4,843 mm). Read on the German Wikipedia G15 'Länge × Breite × Höhe' table (Cabriolet row).
Six-cylinder inline (BMW B58). EPA lists '6 cyl'.
Originally reported as 3 L; stored canonically.
3.0-liter (2,998 cc) BMW B58 turbocharged inline-six. EPA lists the engine as '6 cyl, 3.0 L'.
Originally reported as 608.332055 km; stored canonically.
Calculated from Fuel tank capacity · Fuel economy (city).
Originally reported as 695.236581 km; stored canonically.
Calculated from Fuel tank capacity · Fuel economy (combined).
Originally reported as 125.53239 kW/t; stored canonically.
Calculated from Peak power · Curb weight.
Electronically limited to 250 km/h / 155 mph (BMW figure; all non-M 8 Series variants are limited to 250 km/h). Read on the German Wikipedia G15 top-speed row.
EPA luggage volume 12 ft³ (2-door convertible).
Four-seat 2-door convertible. EPA size class 'Subcompact Cars', listed as a 2-door with 81 ft³ passenger volume.
Originally reported as 101400 $; stored canonically.
2025 model-year base MSRP per the EPA listing ($101,400), excluding destination.
Originally reported as 1990 kg; stored canonically.
EU kerb weight 1,990 kg for the 2024 facelift 840i RWD Convertible (the heaviest non-M body style; 1,955 kg for the 840i xDrive Convertible). Read on the German Wikipedia G15 body-style-specific weight table (Cabriolet row).
Backed by 5 source documents. Expand any value for its full provenance — citation, verification, test conditions, and alternate figures.
Spot a missing or incorrect figure? Add a sourced value — an editor verifies every submission before it appears.
Add dataOriginally reported as 2827 mm; stored canonically.
Wheelbase 2,827 mm for the 2024 facelift G14/G15 (2,822 mm pre-facelift); the Cabriolet shares the Coupé wheelbase. Read on the German Wikipedia G15 'Radstand' table.
Originally reported as 1902 mm; stored canonically.
Width 1,902 mm (excluding mirrors) for the G14 Cabriolet. Read on the German Wikipedia G15 dimensions table (Cabriolet row).
BMW B58 inline-six. EPA lists 6 cylinders; German Wikipedia identifies the engine bauart as 'R6' (Reihensechszylinder).
Wikipedia — BMW 8 Series (G15)Database
Front-engine, rear-wheel-drive layout on the BMW CLAR platform.
Single twin-scroll turbocharger on the B58 (EPA: 'Turbocharger yes'; German Wikipedia: 'Twin-Scroll-Abgasturbolader').
Eight forward gears (EPA transmission code 'S8' = 8-speed automatic with Steptronic select-shift; German Wikipedia: '8-Stufen-Automatikgetriebe').
250 kW / 340 PS / 335 hp at 5,500-6,500 rpm from the B58 3.0L turbo I6 (2024 facelift 840i RWD). Read on the German Wikipedia G15 per-variant Technische Daten table.
500 N·m / 369 lb-ft at 1,600-4,500 rpm for the 2024 facelift 840i (the pre-facelift 840i quoted 450 N·m / 332 lb-ft). Read on the German Wikipedia G15 per-variant table.
ZF 8-speed Steptronic torque-converter automatic (the only gearbox offered on the 840i). EPA lists 'Automatic (S8)'; German Wikipedia lists '8-Stufen-Automatikgetriebe, Getriebehersteller ZF'.
Originally reported as 840.077536 km; stored canonically.
Calculated from Fuel tank capacity · Fuel economy (highway).
Originally reported as 21 mpg; stored canonically.
EPA city rating for the 2025 840i Convertible.
Originally reported as 24 mpg; stored canonically.
EPA combined rating for the 2025 840i Convertible (3.0 L, 8-spd auto, RWD, premium gasoline).
Originally reported as 29 mpg; stored canonically.
EPA highway rating for the 2025 840i Convertible.
Originally reported as 18 gal; stored canonically.
Tank size 18.0 US gallons per the EPA listing (tank-size data attributed to Edmunds on the EPA page).
