2025 Alpina B4 Gran Coupe (G26, facelift 2024) Dimensions, Size & Specs

The 2025 Alpina B4 Gran Coupe weighs 1890 kg (4167 lbs) at curb weight, which accounts for the weight of the vehicle with standard equipment and a full tank of fuel, but no passengers or cargo. Its maximum permissible weight is 2400 kg (5291 lbs), indicating the highest allowable weight including passengers, cargo, and additional equipment. This balance of weight ensures optimized performance and handling characteristic of Alpina models.

With the rear seats in the upright position, the Alpina B4 Gran Coupe offers a luggage capacity of 470 liters (about 16.6 cubic feet), which is quite spacious for a coupe. Folding down the rear seats expands this capacity significantly to 1290 liters (around 45.5 cubic feet), making it versatile enough for carrying larger loads or more cargo while maintaining a sporty design.

The dimensions of the Alpina B4 Gran Coupe, specifically its length of 4800 mm (189 inches) and width of 1850 mm (72.8 inches) without mirrors, generally allow it to fit comfortably in a standard home garage. Standard garage widths typically range from 2400 mm (94.5 inches) to 3000 mm (118 inches), so door mirror clearance at 2073 mm (81.6 inches) opened width is something to consider. Homeowners should ensure mirror clearance space is available to avoid inconvenience, but overall, the B4 Gran Coupe’s size is within typical garage dimensions.

Compared to its predecessor, the latest facelift 2024 Alpina B4 Gran Coupe features subtle adjustments in dimensions that enhance interior space and road presence. While the previous generation was slightly shorter or narrower depending on specifics, this generation extends to 4800 mm in length, promoting improved rear passenger legroom and cargo capacity. The refined dimensions contribute to a more elegant yet muscular stance without compromising agility, representing an evolution rather than a revolution in size.

Within the sporty luxury coupe segment, the Alpina B4 Gran Coupe stands out for its balanced dimensions. Its 4800 mm length and 1850 mm width position it competitively alongside rivals like the BMW 4 Series and Audi A5 Sportback. While some rivals may offer slightly more compact dimensions, the B4’s generous luggage capacity and rear-seat versatility provide practical advantages without sacrificing sportiness. The vehicle’s 1440 mm height helps maintain a sleek profile typical of premium coupes, emphasizing style as well as performance.

The Alpina B4 Gran Coupe is equipped with rims sized 10J x 20 at the front and 8.5J x 20 at the rear, paired with performance tires sized 285/30 ZR20 in the front and 255/35 ZR20 in the rear. These wide and low-profile tires enhance grip, handling precision, and cornering stability, characteristics essential for a sporty coupe. The staggered tire setup fitted on large 20-inch wheels also balances comfort and agility, giving the car both the sporty edge and refined ride quality Alpina is known for.

The Alpina B4 Gran Coupe has a roof load capacity of 75 kg (approximately 165 lbs). This capacity allows owners to safely install roof-mounted accessories such as bike racks, cargo boxes, or ski racks within this weight limit without risking damage to the roof structure or impacting the vehicle's handling and safety. Always ensure that the distributed load doesn’t exceed this limit and that accessories are installed according to manufacturer guidelines.

At a curb weight of 1890 kg (4167 lbs), the Alpina B4 Gran Coupe maintains a weight balance that supports its performance-oriented character without becoming overly heavy. The weight reflects its luxury features, reinforced chassis, and powerful engine components. While slightly on the heavier side for a coupe, this contributes to a planted feel on the road, enhancing stability and driving confidence. Regarding fuel efficiency, the curb weight is a factor, but engineering optimizations in the drivetrain and aerodynamics aim to balance performance with reasonable fuel consumption for its class.