• The measurements mentioned, e.g. 55mm setback, is from the middle of the bottom bracket to the tip of the saddle. The measurement markings on your seatpost are only for you to keep track if you move the saddle forwards or backwards, it's not relative to any other part of your bike.

  • Bit off an odd one though as the scale doesn't start at 0.
    To me that suggests it's connected to something. Haven't quite figured out what though.

  • "The head of S23 VCLS CF is fixed
    aluminium, while the S13 VCLS CF is full-carbon and
    allows infinite setback adjustment between 15 mm and
    35 mm."

    Being as your post doesn't go to an inline position, the scale doesn't start at zero

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