Читать книгу The Bonsai Handbook - Adam Dickson - Страница 21

The most important angle on a frame is the seat-tube angle. This is the angle made by the seat tube and an imaginary horizontal line. It significantly influences the saddle set-back position and therefore is of vital importance to determine the seat angle before buying the frame.

The seat-tube angle is related to the length of your upper leg (femur). A standard frame angle measures 72 to 75 degrees and allows a cyclist with an average-femur length to position the knee straight above the pedal axle with only small adjustments in fore and aft movement of the saddle. The longer your femur, the smaller the seat-tube angle and the farther back the saddle will have to be positioned.