BMW 3 Series Gran Turismo (2021) is 387 mm (15.24 inch) longer, 8 mm (0.31 inch) wider and has 16 liters (0.57 ft3) bigger cargo space than BMW X1 (2019).
BMW X1 (2019) is 89 mm (3.50 inch) higher and 110 kg (243 lbs) lighter than BMW 3 Series Gran Turismo (2021).