I have 19" run flat with sport seats.
Previously I had F30 (3 series), 17" RFT, no sport seats.
No adaptive suspension in both.
The F30 is way comfortable compared to the the X1 as the ride is less stiff. This is noticeable in long rides (more than one hour),
But ! The X1 wheels is much nicer this way and the ride is much fun ! I do not regret it
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