2025 Alpina B3 Sedan (G20, facelift 2024) Dimensions, Size & Specs

The curb weight of the Alpina B3 Sedan (G20 facelift 2024) is 1800 kg (3968 lbs), which is the weight of the vehicle without passengers or cargo but with necessary fluids. The maximum gross weight is 2340 kg (5161 lbs). These weight figures reflect its robust build incorporating performance components, impacting acceleration, handling, and fuel efficiency. The relatively moderate curb weight helps maintain agile driving dynamics expected from Alpina, while the maximum weight ensures good load carrying capacity.

The luggage capacity of the 2025 Alpina B3 Sedan is 480 liters (approximately 16.9 cubic feet). This is quite practical for a sedan in this class, providing ample space for groceries, luggage, or equipment for daily commutes or weekend trips. The well-designed trunk layout ensures ease of loading and unloading while preserving passenger comfort inside the cabin.

The Alpina B3 Sedan is equipped with high-performance tires sized 265/30 ZR20 on the front and 255/30 ZR20 on the rear, mounted on 9.5J x 20 rims at the front and 8.5J x 20 rims at the rear. These wide tires combined with large 20-inch Alpina-specific rims improve grip, steering precision, and cornering stability, crucial for delivering the sporty driving experience Alpina is known for. This setup balances performance with ride comfort for everyday usability.

With a height of 1440 mm (56.7 inches), the Alpina B3 Sedan offers a streamlined profile that enhances aerodynamic efficiency and sporty aesthetics. Its roof load capacity is 75 kg (165 lbs), allowing for the secure attachment of roof racks or cargo boxes. This makes the sedan versatile for carrying additional equipment such as bikes or luggage on top, adding to its practicality for active lifestyles without compromising performance.

Yes, the Alpina B3 Sedan will typically fit into a standard residential garage. The width of the car, including mirrors, is 2068 mm (81.4 inches), and standard garages usually have a door width of around 2400 mm (94.5 inches) or more, providing sufficient clearance on both sides. Its length of 4725 mm (185.8 inches) is also compatible with typical garage depths of 5400 mm (213 inches) or greater, allowing comfortable parking space while leaving room to open doors.

Compared to the previous generation Alpina B3 Sedan, the facelifted 2025 model retains similar length and width dimensions but tends to have slight refinements in aerodynamics and styling that can slightly affect weight. The curb weight of 1800 kg (3968 lbs) likely reflects updated performance and luxury features. Dimensionally, both generations aim to offer a compact executive sedan experience, though the newest generation benefits from improved chassis technology and lighter materials enhancing handling and comfort.

The Alpina B3 Sedan's length of 4725 mm (185.8 inches) and width of 1827 mm (71.9 inches) place it squarely in the compact executive sedan category, similar to competitors like the Audi S4, Mercedes-AMG C43, and BMW M340i. While it shares similar footprint dimensions, Alpina differentiates itself by focusing on a blend of high-performance tuning with refined luxury. Its weight and tire setup also align with sporty driving expectations, making it competitive but with a distinct Alpina character.

With mirrors opened, the Alpina B3 Sedan measures 2068 mm (81.4 inches) in width, which is wider than the cabin itself due to the side mirror extensions. This larger width can be challenging in tight urban settings, narrow streets, or compact parking spaces. Drivers should exercise caution when maneuvering and parking to avoid mirror damage or scrapes. However, this width is typical for performance sedans equipped with aerodynamic side mirrors, and many drivers adapt with experience and assistance technologies.

The recommended tire sizes for the 2025 Alpina B3 Sedan are 265/30 ZR20 for the front and 255/30 ZR20 for the rear, mounted on 9.5J and 8.5J x 20 rims respectively. These sizes are specifically chosen to optimize grip, handling, and vehicle balance. While it is possible to replace tires with slight variations, significant changes in size or profile can negatively affect driving dynamics, suspension geometry, and safety systems like ABS and traction control. It is advised to consult with Alpina or tire specialists to select appropriate alternatives.