Full tuck is an extremely aerodynamic, stooped over bicycle position adopted in an effort to descend as fast as possible. The chest is tucked onto the handlebars, with elbows in and head low.
This minimizes frontal area and air resistance, which allows for higher velocities. It demands core stability, balance, and confidence in steering. Ideal on smooth, straight downhill slopes, the full tuck is the position one learns to become stable and to be able to brake. While tiring to maintain for long durations, its aerodynamic benefit makes it an invaluable skill for the time trial specialist and the downhill rider.
