The BMW XM should be practical enough for family use if its cabin layout suits your passengers. Useful size figures include 2026 M Model Label: 5110 mm; 2025 M Model with Shadow Line Standard: 5110 mm; 2025 M Model Label Red: 5110 mm; 2025 M Model with Night Gold Line: 5110 mm; 2025 M Model with Shadow Line: 5110 mm; 20 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.