Rengoku

The Rengoku (れんごく purgatory) is an Extreme Gear board advertised in the intro cutscene in Sonic Riders. It is neither unlockable or purchasable in the game as it is merely advertised on the digital sign with other recoloured boards.

It resembles the Type-J only recoloured red and white (despite the Type-J being a Babylon Standard exclusively for Jet).

As the Rengoku is not a ridable board, it's statistics are unknown and the information on the advertisement is illegible.