Ridoron

Rideron (ライドロン) is a high-speed car created by Kotaro based on the blueprints given to him by Prof. Walter, a scientist on one of the colonies the Crisis Empire set up. Though immobile at first, Kotaro brought Ridron into the cave of the Kujira Mutant where he was brought back to life in Kamen Rider Black. Able to reach speeds up to 1500 km (932 mph), Ridron can travel over land and sea and has two extendable mandibles on the front used to smash obstacles or ram into enemies. Like Acro Batter, it is highly intelligent and can speak.

All Rider Break
RX got on his Ridron, among many other Kamen Riders and their Rider Machines, to perform the All Rider Break attack to end the final battle with Rock Great Leader.

Trivia

 * In the series production, Ridron was built by Mazda, an automobile company in Japan. Kamen Rider BLACK RX is the only Showa Kamen Rider to have a car, a theme that has been repeated only in Kamen Rider Hibiki, although the cars used in Hibiki were just ordinary vehicles, not a "superhero car" like Ridron. In Let's Go Kamen Riders, Black RX uses Ridron in the All Rider Break finisher against the Rock Great Leader.