There are two options for riser adjustment:
The Accelerator Tie Ball (ATB) is a feature providing a possibility of customization of the speed bar force and travel. Risers with ATB have the accelerator line going through 2 pulleys, which decreases the necessary force for accelerating, but also increases the speed bar travel distance. The ball works as a stop for the first pulley going from 2 pulley system to 1 pulley system at certain point. This divides the accelerator range to two parts. The first is soft but long beginning and harder but shorter finish. By moving the ball up or down, the ratio of these two parts is adjusted to fit the physical proportions of the pilot combined with the harness geometry. Moving the ball up extends the soft-long region at the expense of the hard-short region, and vice versa.
The Rear Riser Handle used for steering while on the speed bar can be moved up and down along the riser to have it at the most pleasant position in relation to pilot proportions and harness geometry. Basically the higher the handle is, the bigger the steering range is. On the other hand, it should not be put too high to be in comfortable reach.