Knee
Pain at the front of the kneecap (saddle too low, cleats too far forward), behind the knee (saddle too high), on the outer side (iliotibial band syndrome, cleats toed in, stiff hip).
Low back
Pelvis locked in posterior tilt, lack of hip mobility, handlebar too far away or too low. The pain appears after 1 to 2 hours and gets worse on climbs.
Neck and shoulders
Position too stretched out for your thoracic mobility, handlebar too narrow, head held up for too long on aerobars.
Hands and wrists
Numb fingers (ulnar or median nerve) from too much weight on the front: saddle setback and angle, handlebar height, gloves.
Perineum
Pressure and numbness linked to the saddle and to pelvic tilt, especially in the aero position.
Feet
Burning, tingling, “hot foot”: cleats, shoe tightness, shoe width, metatarsal position.
Achilles tendon and calf
Cleats too far back or too far forward, saddle too high, stiff ankle.