It was first fully seen in Luffy's fight against Rob Lucci. Luffy corks his mouth with his thumb, bites into his thumb joint (making a small opening) and blows hard into his bones, which inflates his arm. He is then able to transfer the air through his entire body, requiring the torso to act as an interface for his various limbs. Luffy blows so much air into his body that when they are all focused on a single limb, they become the size equivalent to (or greater than) that of a giant's, if anything resembling Oars' size. Used with his already-strong physiology, this apparently gives his arm more mass and a larger area to attack with far greater strength, but he sacrifices mobility for this strength, as his limbs are now so large that Luffy has trouble moving. This is called Gear Three in the Viz Manga, and Third Gear in the Funimation sub and dub. Gear 3 is generally used when raw physical strength is needed, the bones are the key difference between this form and his old "Gomu Gomu no Fusen" move, where his balloon form was soft and squishy like a regular balloon, whereas the inflated bones are very hard, similar to an inflated car tire. Unlike the normal Gomu Gomu no Fusen technique, bullets ricochet off of Gear 3 instead of bounce off.
Luffy inflates his arm to begin Gear 3 before the timeskip.
The bones being much harder also mean a lot of compression of air takes place when using Gear 3, making Gear 3 not just a "for-show" move as Lucci initially thought, but like a giant mace of astounding mass when used in attacks. Because of Luffy's raw strength, he is able to move his gigantic arm with ease. In between his attacks, Luffy brings the air back to his chest and then shifts it into another body part. The downside is, the lag time in which it takes Luffy to transfer and re-channel the amount of air trapped inside his bones can be very disadvantageous. Luffy inflates his arm to begin Gear 3 before the timeskip. Before the timeskip, while in Gear 3, it proved quite difficult for Luffy to move while part of his anatomy has been converted to gigantic proportions, making the Gear inadvisable to use against opponents capable of moving at high speeds (like Lucci) or in an enclosed place as he is leaving himself vulnerable to attack, which is why since his battle against Rob Lucci, Luffy tends to only activate Gear 3 against massive and often slow-moving targets whom he likes to assault with his Gear 3 moves coming from high above in mid-air, where the said attacks could not be obstructed. To deactivate Gear 3, Luffy leaves the form by exhaling heavily, which can cause him to be propelled backwards.
The deactivation of Gear 3 brings about shrinking, which is a negative side-effect for Luffy due to the massive expansion underwent prior to release. The amount of time Luffy spends in his shrunken form is roughly equivalent to the amount of time spent in Gear 3 mode. This shrunken form has shown little to no ability to stretch at all, and it has been shown that Luffy loses an incredible amount of strength when he kept hitting Lucci's face to no effect. The best strategy Luffy could use, while waiting for himself to return to normal, is to run and hide from an opponent for the duration of the shrinkage. Another strategy is only using Gear 3 for a few seconds for only one move so his shrinkage is minimized. But during the Impel Down Arc, Luffy demonstrated using his Gear 3 with great speed. Being fast enough to defeat Jailer Beasts, who possessed Soru-level speed.
39;s arm, thus reducing the speed of the attack in exchange for a powerful impact.
During the Whitebeard War, this drawback was not shown during every use, perhaps being glossed over by the many different battles taking place all at once; but the anime still includes the drawbacks. When Luffy used Gomu Gomu no Gigant Fuse during his encounter with Fleet Admiral Sengoku, Sengoku himself referred to Gear 3's increased size as Gigantification. After the timeskip, as with Gear 2, Luffy seems to have obtained better skill at utilizing Gear 3. Previously, Gear 3 would increase the size of the majority of Luffy's arm, thus reducing the speed of the attack in exchange for a powerful impact. However, Luffy after two years can seem to control where the air is stored within his limbs, where his fist becomes large and instead of the air being equally distributed throughout his arm, an equivalently large mass forms behind the fist. This allows a majority of Luffy's arm to remain as it is, permitting him to stretch it, thus allowing him to attack and withdraw much faster than pre-timeskip. He was seen being able to enlarge his right fist while inside a Yarukiman bubble (where there is limited air supply) rapidly upon engaging against the Kraken, demonstrating the use of infusing Busoshoku Haki into his colossal-sized arm to enforce its durability and defeat the sea monsters. Noah for a prolonged period of time and not turning into his chibi form. Luffy has also shown to use this form defensively in battle, as seen when he fought Admiral Fujitora. In this battle Luffy enlarged his arm using Gear 3 (though the enlargement was comparatively small compared to usual), and applied Busoshoku hardening to it in order to use it like a shield against the Admiral's powerful attacks.
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In this way, it was capable to defend against Issho's slashing attacks. Most of the techniques in this mode are named the same as the regular attacks with "Gigant" added after the "Gomu Gomu no" prefix. German for "Giant". In some techniques like Gigant Whip and Gigant Axe, Luffy uses the English name of the technique instead of the Japanese name, saying "Axe" and "Whip" instead of "Ono" and "Muchi". Hone Fsen (骨風船, Hone Fūsen?, literally meaning "Bone Balloon"): Luffy inflates his body by blowing air into his bones. This is done by biting into his right thumb, presumably cutting it open down to the bone, and then blowing air directly into the opened bone. This technique seems to give Luffy a sturdier defense than the regular balloon, since bullets now ricochet off of him instead of bouncing off of him. Due to this form having a disadvantage of moving about, he can transfer his air into his torso, and then launch himself with his “Gomu Gomu no Rocket” technique. This was first fully shown in Luffy's battle against Rob Lucci. In the Viz Manga and Funimation adaptations, this is called Bone Balloon. Gomu Gomu no Gigant Pistol.
In the Viz Manga and Funimation adaptations, this is called Gum-Gum Giant Axe.
Gomu Gomu no Gigant Pistol (ゴムゴムの巨人の（ギガント･）銃（ピストル）, Gomu Gomu no Giganto Pistoru?, literally meaning "Rubber Rubber Giant's Pistol/Gun"): Luffy delivers a Gomu Gomu no Pistol with extreme force due to the larger size of his fist. This was first fully seen being used against Rob Lucci. Its sheer power was able to fling him from the Bridge of Hesitation on to a Buster Call Battleship. In the Viz Manga and Funimation adaptations, this is called Gum-Gum Giant Pistol. The kanji's literal reading is "Kyodai no Jū". Gomu Gomu no Rocket (ゴムゴムのロケット, Gomu Gomu no Rokketo?, literally meaning "Rubber Rubber Rocket"): A Gear 3 version of Luffy's normal Gomu Gomu no Rocket. While using this move, Luffy's chest bones are inflated, and bullets ricochet off his body. This is not explicitly named as a "Gigant" move. This was first seen being used to propel Luffy onto a Buster Call battleship in pursuit of Rob Lucci. Gomu Gomu no Gigant Axe (ゴムゴムの巨人の（ギガント･）斧（アックス）, Gomu Gomu no Giganto Akkusu?, literally meaning "Rubber Rubber Giant's Ax"): A Gomu Gomu no Ono with even more power due to his enlarged foot and leg. This was first seen being used against Rob Lucci. Its sheer power is able to damage and create a hole in the deck of a Buster Call Battleship. In the Viz Manga and Funimation adaptations, this is called Gum-Gum Giant Axe. The kanji's literal reading is "Kyodai no Ono", and like the Jet version of Ono, it lacks the "sen" (war) kanji (戦). Gomu Gomu no Gigant Whip (ゴムゴムの巨人の（ギガント･）鞭（ウィップ）, Gomu Gomu no Giganto Wippu?, literally meaning "Rubber Rubber Giant's Whip"): Gomu Gomu no Muchi with more power due to his enlarged foot and leg.
This was first seen being used against Oars to break his spine.
This was first seen being used against Rob Lucci. Its sheer power is able to damage the mast of a Buster Call Battleship. In the anime, Luffy used a haki-infused version against Doflamingo. In the Viz Manga and Funimation adaptations, this is called Gum-Gum Giant Whip. The literal kanji reading is "Kyodai no Muchi". Gomu Gomu no Gigant Bazooka (ゴムゴムの巨人の（ギガント･）バズーカ, Gomu Gomu no Giganto Bazūka?, literally meaning "Rubber Rubber Giant's Bazooka"): A Gear 3 version of Luffy's Gomu Gomu no Bazooka attack. To create this attack, Luffy inflates both his arms by biting both his thumbs and blowing into them. With both his arms inflated to large proportions, Luffy then delivers the attack onto an opponent the same way he regularly does with a normal Gomu Gomu no Bazooka attack, except with much greater power. This was first seen being used against Oars to break his spine. In the Viz Manga and Funimation dub, this is called Gum-Gum Giant Bazooka. Gomu Gomu no Gigant Jet Shell. Gomu Gomu no Gigant Jet Shell (ゴムゴムの巨人の（ギガント･）ＪＥＴ（ジェット）砲弾（シェル）, Gomu Gomu no Gigant Jetto Sheru?, literally meaning "Rubber Rubber Giant's Jet Shell"): This was Luffy's strongest technique at the time.
While he is still in Gear 2, Luffy goes into Gear 3 with Hone Fuse. With the combination of Gear 2's high speed and Gear 3's air within his bones, Luffy launches his air filled body and rams into an opponent like a large cannonball. This move is quite reckless, as Luffy suffers both from the excess burn on his body from Gear 2, and the difficulty of moving his body from Gear 3. This was first seen being used against Gecko Moria while he is in his Shadow's Asgard form. In the Viz Manga and Funimation dub, this is called Gum-Gum Giant Jet Shell. The literal kanji reading is "Kyodai no JET Hōdan", with "hōdan" being a Japanese term for a gun shell. Gomu Gomu no Gigant Rifle (ゴムゴムの巨人の（ギガント･）回転弾（ライフル）, Gomu Gomu no Giganto Raifuru?, literally meaning "Rubber Rubber Giant's Rotating Bullet"): Luffy activates Gear 3 to expand one of his arms and then use it to launch a giant version of the original Gomu Gomu No Rifle at a target with greater power, drilling hard into the unfortunate target. This attack is strong enough to destroy the heavily-armored Pacifista, and was first seen being used to defeat PX-4 on the Sabaody Archipelago. The fist produced in this attack is approximately the same size as the entire body of the giant Luffy uses it to defeat.
In the Viz Manga and Funimation adaptations, this is called Gum-Gum Giant Rifle. Unlike the variations of Jet Rifle, this version of the attack is written in kanji like the original base version; the literal kanji reading is "Kyodai no Kaitendan/Kaitendama". Luffy's Gigant Stamp combined with Mr. 3's Giant Candle Wall. Gomu Gomu no Gigant Stamp (ゴムゴムの巨人の（ギガント･）スタンプ, Gomu Gomu no Giganto Sutampu?, literally meaning "Rubber Rubber Giant's Stamp"): Luffy activates Gear 3 and expands his foot to deliver a giant version of Gomu Gomu no Stamp with greater force. Incidentally, this was first used in conjunction with Mr. 3's Giant Candle Wall to push it back. This was first seen being used against Magellan in Impel Down. In the Viz Manga and Funimation adaptations, this is called Gum-Gum Giant Stamp. Gomu Gomu no Gigant Fsen (ゴムゴムの巨人の（ギガント･）風船, Gomu Gomu no Giganto Fūsen?, literally meaning "Rubber Rubber Giant's Balloon"): Luffy activates Gear 3 and expands his torso to create a giant version of his traditional Gomu Gomu no Fusen, with a lot of sturdier defense. This move was strong enough to cushion the impact from a massive adversary and was first used to protect Ace and Mr. 3 from a punch of Sengoku in his giant form. In the Viz Manga and Funimation adaptations, this is called Gum-Gum Giant Balloon.