: First appeared in and Episode 870 during the fight against Charlotte Katakuri. Functionality and Origin
The introduction happens during the climax of the . Luffy is locked in a life-or-death struggle against Donquixote Doflamingo , one of the Seven Warlords of the Sea.
Gear 4 is first introduced in Chapter 784 , titled "Gear Fourth." This chapter was released in April 2015.
Gear 4 makes its debut in Chapter 784 of the One Piece manga, titled "Gear 4."
His skin becomes like a high-pressure tire, allowing him to bounce off the air (Geppo) and compress his limbs like springs.