Experiencing pain in the front of your knee? Your seat is probably too low, causing you to under-extend your pedal stroke. At the right seat height, your knee should be slightly bent at the bottom of your pedal stroke, when the crankarm is parallel to the seat tube, not perpendicular to the ground. To check this, pedal unclipped with your heels on the pedals. You should barely maintain contact with the pedal at the bottom of the stroke, without rocking your pelvis. Measure the distance between the bottom bracket and the top of the seat. This is your seat height. It should be very close to the product of your inseam (in centimeters) multiplied by 0.883.