The MINI Countryman should be practical enough for family use if its cabin layout suits your passengers. Useful size figures include 2026 2.0T S: 4444 mm; 2025 2.0T S: 4444 mm; 2026 2.0T S: 1843 mm; 2025 2.0T S: 1843 mm; 2026 2.0T S: 1661 mm; 5 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.