The attachment is suitable for round and oval seat tube Ø 28-40 mm

1: Mount the frame attachment on the seat tube. Tighten the nuts by hand.

2: Place the bracket where the seat is attached to the frame attachment and secure it with the two nuts.

3: The bracket must be positioned horizontally above the rear wheel, the distance between the bracket and the rear wheel must be at least 10 cm. If that is not the case, move the attachment up or down, or change its angle by adjusting the movable inner ring. 

4: The movable inner ring allows you to adjust the position of the attachment to the angle of inclination of the frame so that the bracket moves horizontally above the rear wheel. 

5: Then tighten the nuts firmly with open-ended spanner 13 (torque 6.0Nm). Note: Tighten the nuts crosswise and evenly.