The seat post is suitable for oval / circular guide cushions. The <br><br>angle of the seat cushion is adjusted by the two screws on the front and back of the seat post clamp.
The seat lever is suitable for oval/circular rail cushions.<br><br>The seat cushion angle is adjusted by two screws before and after the seat rod clamp.
The seat bar is suitable for oval / round guide cushion<br>The angle of the cushion is adjusted by two screws at the front and rear of the holder bar clamp