Cycling Technique Reference

With the LEFT crank at top-dead-centre (12 o'clock), draw the thigh line (hip → knee) then the shank line (knee → ankle). The included angle is the maximum knee flexion of the stroke.

With the LEFT crank at top-dead-centre, draw the torso line (shoulder → hip) then the thigh line (hip → knee). The included angle is hip closure — relates to reach and saddle fore-aft.

From the front during the down-stroke, draw the LEFT thigh line (hip → knee) then the shank line (knee → ankle). Inward deviation of the knee toward the top tube is valgus; outward is varus.

With the LEFT crank at bottom-dead-centre (6 o'clock), draw the thigh line (hip → knee), then the shank line (knee → ankle). The included angle is knee extension — the primary saddle-height metric.

With the LEFT crank at bottom-dead-centre, draw the shank line (knee → ankle) then the foot line (ankle → toe). The included angle is the ankling pattern at the bottom of the stroke.

On a steady seated frame, draw greater trochanter → acromion (hip → shoulder). The angle versus horizontal is the trunk angle — how aggressive/aero the position is.

On a steady seated frame, draw the upper-arm line (shoulder → elbow) then the forearm line (elbow → wrist). The included angle is elbow bend — a reach/comfort indicator.

Mark a window and count full pedal revolutions of ONE leg inside it; the tool computes revolutions per minute.