The BMW 3 Series should be practical enough for family use if its cabin layout suits your passengers. Useful size figures include 2025 M340i xDrive M Sport Pro: 4713 mm; 2025 330i M Sport: 4713 mm; 2025 320i Sport: 4713 mm; 2025 M340i xDrive M Sport Pro: 1827 mm; 2025 330i M Sport: 1827 mm; 11 more variants. Wheelbase and seating matter most day to day because they influence rear-seat comfort, child-seat friendliness and how relaxed the car feels on longer trips.