Luffy compresses his limbs like coiled metal springs, unleashing explosive propulsion that allows him to pseudo-fly by bouncing off air currents.
He debuts this transformation in of the One Piece anime and Chapter 784 of the manga. when does luffy go gear 4
As explained by reviewers at Crunchyroll , Gear 4 combines the air-injection of Gear 3 with the blood flow speed of Gear 2, all while coating his muscles in intense . Luffy compresses his limbs like coiled metal springs,