FreeX X-one Mode D'emploi page 65

The riser
The 4 riser system of the X-ONE is adjusted to a uniform length
of 55 cm. This allows uncomplicated handling when launching
as well as the ability to reach line links during flight. The precisely
designed transmission ratio of the riser system is adapted to the
profile and combines a reduction of angle of attack with a
decrease of arch upon accelerating via the foot bar.
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