Situational Techniques
Luffy stretches his arms through his opponent's eyes and grabs onto their nose to launch himself out. In the VIZ manga, this is called Gum-Gum Escape Rocket.
Gear 5 allows him to change the rhythm of his heart, he can basically remap his blood pressure and heartbeat to match the tension of the fight.
He can use it anytime. He needs to be close to death.
While using Gear 5th, Luffy is able to extend his elasticity to inanimate objects. Luffy's devil fruit awakening allowed him to beat Kaido, who was considered the "Strongest Creature in the World." In his Gear 5th form, there are not many One Piece characters who can defeat him.
Yes he is. He won their final clash and overpowered Kaido's strongest attack with his strongest attack. Now I know that many people claim, Kaido was weakened and had to fight several enemies before fighting Luffy.
Luffy is close to Shanks in terms of power and it is only after their fight that he will officially be able to call himself stronger than Shanks.
The concept of power up Gears has been a core part of the One Piece franchise and allowed Luffy to take on the most difficult of foes. Fans speculate Gear 6 is inevitable – and with the series winding up to its conclusion, it could play a pivotal part in the final conflict.
The more he laughed, the better he seemed to fight. Throughout the clash against Kaido, fans could see him laughing even though he was fighting a high-intensity battle, which just goes to show how important it is to his character.
The current Egghead Island arc has showcased Luffy's final form 'Gear 5' for the second time, after defeating Kaido at the end of the Wano arc.
Bajrang Gun is, by far, the strongest technique that Luffy has developed in Gear Fifth so far. This technique sees and makes use of everything that he has got. While using Gear Fifth, Luffy creates a fist big enough to dwarf an entire island and retracts it just like he does in Gear 4th.
No. Luffy can't defeat Goku.
Related: One Piece's Luffy vs Dragon Ball's Goku: Can Gear 5 Beat a Saiyan? In terms of the actual transformations themselves, Baryon Mode provides a much larger increase in power at the cost of an even greater risk to the user.
Im probably not have like the good answer but it's the closest answer to it since I'm to lazy to actually scale the length of his arm, but anyway let's get to the point luffy's arm is around 90 cm long and 1 gomu gomu is twice luffy's arm ano that's 180cm so now 180cm x 72 = 129.60 meters.
One Piece's most recent chapter confirms that Luffy can now actually manipulate reality, as shown in his battle against Rob Lucci on Egghead Island.
The drawbacks of Luffy using Gear 5 in One Piece
Luffy only used this for a short time, but it was enough to completely deplete his stamina to the point of making him visible age due to exhaustion and fatigue. Luffy was even forced out of this form because of losing energy.
Gear 5 is Luffy's pinnacle power, and he can do anything he wants in this form. Furthermore, it is mentioned that his powers are only limited by his imagination. With this gear unlocked, Luffy is said to resemble the “Warrior of Liberation” — Sun God Nika, who is said to bring smiles, joy, and freedom to the people.
Since Luffy's Devil Fruit is actually a Mythical Zoan instead of a Paramecia, it granted him a completely new transformation instead and typical of Luffy, he ended up naming it Gear 5. In this form, Luffy gains a completely white transformation and takes on an appearance similar to that of the "Sun God" Nika.
After Luffy won the match, Kaidou recalled an earlier conversation he had with King where he said that Joy Boy would be the one to defeat him, implying that in his final moments, he recognized that Luffy was none other than Joy Boy after all.
Gear 10th Luffy is Luffy's ultimate form from the upcoming speculative fan-made sequel to One Piece, Son of the Pirate King. Luffy has continuously trained his haki and Devil Fruit powers during his time as Pirate King until he achieved this gear.
No. Luffy can't defeat Goku.
With his devil-fruit powers, Luffy is able to manipulate his rubbery body into various forms, which he calls “Gears.” Currently, Luffy has managed to unlock up to five gear forms, and his fifth gear is known to be his peak form. He was able to unlock Gear 5 after awakening his devil fruit.
Roger and his men, as seen during the Oden flashback, would simply be too strong for Luffy to defeat in a fight.
Pitted Against The Navy's Strongest
In this case, it is safe to say that with further mastery of Gear 5, to negate its drawbacks, as well as a bit more proficiency in his use of Conqueror's Haki-infused attacks, Luffy should be able to defeat the two Admirals by the end of the story.
1) Marshall D.
Blackbeard is arguably the biggest counter to Luffy's Gear Fifth. Most characters can only hope to survive it. Meanwhile, Blackbeard can just cancel these Devil Fruit powers with his Yami Yami no Mi.