RATTAN LF PRO Series, User Manual

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2. Adjust the Seat Height
An ideal seat height for most riders allows them to be comfortable and
get the best pedaling efficiency. When the rider is seated, they should
be able to place the ball of their feet on the pedal at its lowest position
while their legs is almost fully extended, with the knee slightly bent.
The seat should never be so high that the rider must rock sides to side
or fully straighten their legs while pedaling. And the seat must never be
pulled out so far that the minimum insertion point is above the seat
tube (see illustration).
Overextending the seatpost can cause it to break or fall off your
bike, which will put you at very high risk of serious injury or death.
Avoid this danger by inserting your seatpost into the seat tube far
enough that the minimum insertion point is no longer visible.
WARNING