LifeSpan C3i Owner's Manual page 35

Seat Height Adjustments
Your C3i bike allows for 19 positions of height adjustment. To adjust the seat, turn the seat post
adjustment knob (M) counterclockwise 2 full turns. Pull the knob out and adjust the seat
height to the desired position. Once the desired position is reached, release the seat post
adjustment knob and slide the seat up or down until the knob pops back into one of the
designated positions. If the seat is located in the desired position turn the seat post
adjustment knob clockwise to tighten.
C3i
Interactive Trainer
M
35