Trunk comparison: BMW iX1 vs BMW X4

Key Differences and Their Impact on Usability

The clearest advantage of the BMW X4 lies in the usable loading length with the first row of seats upright: the X4 offers +4.7 in (+13%) more cargo space than the iX1, allowing longer items (e.g., skis, long boxes, or furniture parts) to be transported more easily even with a full load.

Also noticeably different is the installation depth between the loading edge and the trunk floor: the X4 has +2.4 in (+300%) more here, indicating a deeper trunk space and providing more volume or better room for bulky or taller items behind the loading edge.

These differences have practical effects: the X4 is better suited when longer or taller cargo needs to be transported regularly without folding down the rear seats. The deeper trunk also allows items to be stored lower, which stabilizes tie-downs and makes better use of the cargo volume.

Smaller deviations concern the loading edge and opening: the X4’s loading edge is 2.8 in (10%) higher above the road, making lifting heavy loads somewhat more strenuous, while the iX1 has a trunk opening that is 0.8 in (3%) higher and 2.4 in (6%) wider, facilitating loading of wide items.

At the narrowest point, both models are equally wide.

These points affect handling during loading and unloading but do not change the fundamental suitability of the vehicles for longer or taller cargo: for that, the X4 is the more practical choice, while the iX1 offers advantages in easier, flatter access and wider loading openings.