How many Gears does Luffy have in One Piece?

Monkey D. Luffy has a total of 6 gears (Three being subforms of Gear 4) and are divided into four levels. These Gears have become stronger over time and give Luffy huge amounts of power.

Monkey D. Luffy- Gears 8 and 9 by Nectp on DeviantArt

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Monkey D. Luffy- Gears 2 and 3 by Nectp on DeviantArt