The stationary-bike seat is roughly level with your hips, but the first few pedal strokes still leave you wondering whether it is set correctly. Raising it another notch is an easy guess. A more useful check involves putting your heel on the pedal temporarily, then looking at what happens when your foot moves into its riding position.
Exercise physiologist Aaron Karp describes that method in Hospital for Special Surgery’s bike-setup guide. The straight knee belongs to the heel-position check. Once your foot is in its normal pedaling position, the knee should retain a slight bend.
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Use the heel position as a setup check
Karp’s starting point is a saddle around hipbone height while you stand beside the bike. He then has you sit on it without clipping in or using the pedal cages yet. Place your heel at the front of one pedal and move it to the bottom, roughly six o’clock. In that heel-on-pedal position, the leg should be straight.
Heel contact is temporary. Move your foot into the usual riding position before pedaling; do not carry the straight-knee target over into the ride.
Check the leg while you pedal, too
The group-cycling guidance by Mary Yoke and Carol Armbruster places the balls of the feet on the pedal centers, rather than the arches. With that contact, the extended leg should still have a slight knee bend. Their guidance also flags hips rocking from side to side when the seat is too high.
That gives you something to observe beyond the seat-post number. A stationary check and a few controlled pedal strokes answer slightly different questions: where the leg reaches, and how you move through repeated revolutions.
Height is also only one adjustment. The same teaching guide separates saddle height, the saddle’s forward-or-back position, and handlebar height. A reach that feels cramped or stretched is worth checking separately, rather than trying to solve every setup issue by raising or lowering the seat.
For the front-to-back check, Jacksonville Orthopaedic Institute’s cycling guidance places the crank horizontally, with the forward knee over the pedal. That is a different crank position from the bottom-of-stroke height check, so avoid trying to assess both at once.
Leave time to settle into the ride
Physical therapist Ehren Allen, the author of that guidance, also emphasizes taking time for the warm-up. Make the adjustment before you are trying to follow a hard interval or keep pace with the class. That leaves room to notice the position without rushing the check.
Allen also distinguishes muscular effort from sharp or joint pain: do not keep pedaling through the latter. A setup check is not a diagnosis or a reason to push through discomfort that limits riding; that calls for individual assessment.
After checking the setup, planning your exercise week is a separate decision about how much activity to do and when. Before that first ride, ask the instructor to check both the temporary heel position and your normal pedaling position.