Most of the times its shown as a Belt but it has been shown as something else at times like a Tuning Fork or a phone.
Riders use this as way to transform into their rider forms it can be a belt, a phone or a brace or even a tuning fork and a CG bat.
And some Riders even use cards to transform into a rider Den-O needs his Den liner pass and Ryuki his Advent Deck.
Also most of the time they also use it for power-ups, to transform into upgraded Rider Forms, to get weapons and activate finishers.
Rider Systems are grouped in 3 ways.
Most of the old Riders have this system because they where cyborgs originally made by evil organizations to assassinate people.
So that`s why they needed to suit up quickly. Most modern technological Rider have a belt that transports the armory and weapons to the one that uses it. However as for one line of Kamen Riders G3 mild / G3 / G3-X / G4 That is not the case they needed to suit up like a normal person does and the belt was only a advanced battery system.
Kamen Rider Fourze
Kamen Rider Gaim
Kamen Rider Drive
These Riders transform by a mystical cause not so much that they are all mystical beings they could also use a Mystical belt to transform themselves and call up the weapons they use.
ShadowMoon (not really accepted as a true rider and he never really transformed but his system was similar yet superior to Kamen Rider Black`s system)
Kamen Rider OOO
Riders who literally transform into a monster-like creature resembling a Kamen Rider the first Amazon needed a armband to transform into and stabilize his Rider form, The second (and movie only) Rider Shin was a mutant who didn't need a belt or armband, but physically transformed into a monstrous hopper-like creature. In Agito there was Kamen Rider Gills a flawed form of Agito and even though he biologically turned into a Rider he did have a visible belt . The Ryuki riders also count because they use the power of the contracted MirrorMonsters to powerup and also use them for the ''Final Vent'' feature of they`re system
Kamen Rider Gills
Kamen Rider Another Agito
Kamen Rider Chalice
|Thing Name||Rider System|
|Romaji Name:||Raidā System|
|1st manga book:|
|1st anime episode:||Kamen Rider #1|
|1st anime movie:|