Ride Booster Set

The Ride Booster Set (ライドブースターセット) is a pair of Rider Machines, with the red one called Ride Booster Red (ライドブースターレッド) driven by Kamen Rider Mach and the blue one called Ride Booster Blue (ライドブースターブルー) driven by Kamen Rider Chaser. They can also be combined with Tridoron to form the Booster Tridoron (ブースタートライドロン).

The Ride Booster Set initially appears in the alternate timeline of , with Chase driving Ride Booster Blue as Mashin Chaser, before debuting in the series proper in episode 27.

History
In the prime timeline, Mr. Belt had Rinna Sawagami create the Ride Booster Set as extra gear which would allow Tridoron to utilize the combined power of all three Kamen Riders, as Chase had recently rejoined the fight against the Roidmudes as Kamen Rider Chaser. Upon completion, they and their combination with Tridoron was demonstrated to Shinnosuke, Mr. Belt, Kiriko and Gou. At first Gou was pleased that they had extra firepower to wipe out the Roidmudes faster, but felt uneasy when told of Chase's part in the combination, as he still didn't trust him due to Chase being a Roidmude himself. Later on, the Ride Boosters were first put to action against the Roidmudes, when Chase summoned his Ride Booster Blue to back him up against the Seeker Roidmude's henchmen 078 and 082 while preparing his Shingou-Ax's Across Breaker. Boarding the Ride Booster Blue, Chase proceeded to destroy the two Roidmudes along with their Cores by performing two variations of the Across Breaker in quick succesion. Enraged at Chase's presence, Mach boarded his Ride Booster Red and attacked the Roidmude Kamen Rider, firing at him with his Zenrin Shooter before jumping off and pushing Chase off the Ride Booster Blue.