The BMW X1 should be practical enough for family use if its cabin layout suits your passengers. Useful size figures include 2025 sDrive20i xLine: 4500 mm; 2025 sDrive20i xLine: 1845 mm; 2025 sDrive20i xLine: 1642 mm; 2025 sDrive20i xLine: 2692 mm; 2025 sDrive20i xLine: 5. 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.