The window openings need to be large enough to pass large drinks through without spilling them and the cup holders have to be able to hold 2 large drinks. Half rolled down windows make it impossible to ride with your arm on the windowsill.
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Just making the wheel fairings on left and right quickly and easily removable for narrow towns etc where the current wheel width is excessive in small villages, then put them back on for long journeys where the aerodynamics matter more.