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The Kurosai FR-U IV ("Black Rhino FR-U IV") is one of the newest additions to the Thousand Sunny's Soldier Dock, residing in the previously unoccupied Dock 4.[1]


It is a giant black motorcycle with three wheels and the armored head of a rhino. It is very powerful, and capable of barreling through multiple enemies. It has the trademark star on the two back wheels. It is made of Wapometal and can "dock" with the Brachio Tank V to form the Iron Pirate General Franky.


Kurosai FR-U IV Front
The Kurosai FR-U IV viewed from the front.
Kurosai FR-U IV Pre-Docking
The Kurosai FR-U IV transforms into the arms of General Franky.


Fishman Island ArcEdit

When the New Fishman Pirates' Hyper Toxin Squadron tried to poison Nico Robin, Franky drove the motorcycle out to run down the squadron, having immunity from the pricks and poison. A giant fishman tried to smash Franky and the bike with a giant flail, but was taken down by another new addition to the Soldier Dock, the Brachio Tank V. After both vehicles were caught in a pitfall made by Daruma, Franky took them both over, and "docked" them to form Iron Pirate General Franky.


  • The name FR-U means General Franky no Ude (フランキー将軍の腕 Furankī Shōgun no Ude?, literally meaning "General Franky's Arms").


  1. One Piece Manga and AnimeVol. 64 Chapter 635 and Episode 556, Franky reveals the Kurosai FR-U IV against the New Fishman Pirates.

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