Clockworks are small cars which is needed to turn their spin/key for powering them.
Clockworks are also called "Key Cars", as seen inside their individual Parameters.txt. They also uses an unique engine sound (clockwrk.wav), except for the ones in Frontend.
Earlier Re-Volt concepts includes clockworks as they could be found in gallery.
In Re-Volt there are 4 cars whose folders' name begins with "wincar".
The first three (Clockwork/Clockwork Wun (wincar; green), Clockwork Too (wincar2; yellow) and Clockwork Tree (wincar3; red)) are the ones in Frontend, which the main purpose of use can be for testing video settings without enter a race so see the results. As for the fourth named Clockwork (wincar4; white) is the one that's colored inside the game and used in the Clockwork Carnage, except for the PlayStation version where the first clockwork (green) is the one used for this playmode.