2021 BMW 8 Series

The 2021 BMW 8 Series brings grand-touring style, strong performance, and open-air bodywork to Herb Chambers BMW of Boston in Boston, MA. This page introduces the three-trim convertible lineup, including starting MSRP, power, fuel economy, drivetrain choices, dimensions, and key configuration details. Shoppers can compare the 840i, 840i xDrive, and M850i xDrive, then explore current BMW options through live inventory. Herb Chambers BMW of Boston serves drivers throughout Greater Boston, including Brookline, Newton, Cambridge, Somerville, Allston, Brighton, Watertown, and Quincy, with sales and BMW service support at 1168 Commonwealth Avenue.

Starting MSRP

$97,400

Horsepower

335–523 hp

EPA MPG

17–20 city / 24–27 hwy

Drivetrain

Rear Wheel Drive / All Wheel Drive

Fuel

Premium Unleaded (Recommended) / Premium Unleaded (Required)

Body Style

Convertible

2021 BMW 8 Series Trims and Pricing

Pricing spans three convertible trims, from the rear-wheel-drive 840i to the performance-focused all-wheel-drive M850i xDrive. MSRP excludes tax, title, registration, and dealer fees.

The 840i starts at $97,400 with 335 horsepower, rear-wheel drive, a 3.0-liter inline six-cylinder engine, and 368 lb-ft of torque. For $100,300, the 840i xDrive adds all-wheel drive while retaining 335 horsepower, 3.0-liter inline six-cylinder power, and 368 lb-ft of torque; it also records 20 city MPG, 27 highway MPG, and a 4.6-second 0-to-60 time. The $121,400 M850i xDrive steps up to 523 horsepower, a 4.4-liter V8, 553 lb-ft of torque, all-wheel drive, 17 city MPG, 24 highway MPG, and a 3.8-second 0-to-60 time.

Specifications and Configuration

The 2021 BMW 8 Series is a convertible with an automatic eight-speed transmission and either rear-wheel drive or all-wheel drive, depending on trim. Across the lineup, engine displacement ranges from 2,998 to 4,395 cc, while curb weight ranges from 4,356 to 4,736 pounds.

Fuel capacity is 18 gallons, and cargo space behind the rear seats measures 12.4 cubic feet. Overall length ranges from 191.1 to 191.2 inches, width is 74.9 inches, height ranges from 52.7 to 53 inches, and wheelbase measures 111.1 inches. Width with mirrors is 84.1 inches.

Peak power arrives between 5,000 and 5,500 rpm, while peak torque arrives between 1,600 and 1,800 rpm. Premium unleaded is recommended for the 840i and 840i xDrive and required for the M850i xDrive.

Buying a 2021 BMW 8 Series in Boston

Herb Chambers BMW of Boston is located at 1168 Commonwealth Avenue in Boston, MA 02134. Begin with the dealership’s search inventory to review current BMW vehicles and contact the store at (617) 271-2376 for assistance with next steps.

For shoppers considering a trade, the dealership also offers a convenient trade-in evaluation. BMW service support is available through the local Service Center, staffed by factory-certified, OEM-trained technicians and equipped for maintenance, diagnostics, brake service, tire care, and other BMW needs.

What to Weigh Before Buying

Trim choice shapes the 8 Series experience. The 840i emphasizes rear-wheel-drive grand touring, the 840i xDrive adds all-wheel-drive traction, and the M850i xDrive delivers the highest horsepower and torque figures in the lineup.

Fuel requirements and operating priorities also deserve attention. Premium unleaded is recommended for the 840i models and required for the M850i xDrive, while fuel economy ranges from 17 to 20 city MPG and 24 to 27 highway MPG across trims.