Ridewatches

The Ridewatches (ライドウォッチ) are pocketwatch-like devices that contain the power of past Kamen Riders, used by the Riders in Kamen Rider Zi-O.

Overview
Ridewatches are armament devices designed like stopwatches that are the power sources for Ridewatch-compatible Rider Systems.

Ridewatches based on previous Kamen Riders are created by that previous Kamen Rider infusing their powers and the memories of their powers. With main Riders, with infusing their powers, it also removes their monsters' history as well.

Design
A normal Ridewatch consists of the following parts:
 * Ride On Starter (ライドオンスターター) - The activation button on top of the Ridewatch. Turning it on will shift the Ridewatch to a standby state before inserting it into the Ziku Driver. Pressing it again will allow the Rider to execute a finisher.
 * Outrigger Grip (アウトリガーグリップ) - The overall exterior body of the Ridewatch. The shape stabilizes the rotation motion of the Wake Bezel and loading of Ridewatch into the Ziku Driver.
 * Wake Bezel (ウェイクベゼル) - The dial of the Ridewatch. It is an energy release valve. By rotating it from its sleep state, which displays the Rider symbol and corresponding year date (in A.D.), to its active state, the Ridewatch becomes active, which displays the full face of the Rider.

Functionality
The Wake Bezel is turned 90 degrees clockwise, causing its arrow to face the direction that it is inserted into the respective slot on the Ziku-Driver. It activates when the Ride On Starter is pressed, and it is inserted into its corresponding slot on the Ziku-Driver before it was rotated 360 degrees to transform. Zi-O and Geiz 's personal Ridewatches are inserted into the D '9 Slot to access their base forms, and Ridewatches based on past Kamen Riders are inserted to the D '3 Slot to access Rider Armor forms based on those Kamen Riders.

Creation
In Kamen Rider Zi-O, episode 2, Sougo ascertained the conditions needed to create a Ridewatch:
 * 1) Confirm that an Another Rider exists during the present day.
 * 2) Meet the Rider in which the Another Rider is based on in the past during the year that they were active.
 * 3) Return to the present day and meet the Rider, letting them know that they've met them before. It will cause the Ridewatches in which they received from the user in Step 6 to manifest onto the veteran's Rider's hand, causing them to regain their memories.
 * 4) The veteran Rider will return the Ridewatch to the user and ask them to protect their wishes.
 * 5) Return to the past and defeat the Another Rider.
 * 6) Give the veteran Rider(s) a blank Ridewatch, in which they will later manifest when the user returns to the present day to receive them in Step 3. This is the start of a time loop in which the veteran Riders lose their memories from this point on and will temporarily regain them as Sougo approaches them in 2018.
 * According to Woz's opening narration in episode 2, the Ridewatches actually "steal" the powers of past Riders along with their entire existence as Riders from time. This presents a sinister aspect to their creation, as Riders lose their memories and powers upon Zi-O or Geiz's first activation of the respective RideArmor.
 * In episode 5, it's revealed Ridewatches not just steal the history of Riders, but also their villains, effectively erasing all conflict from time and preventing a much more imminent bad future from forming.

List of Ridewatches
{{#tag:tabber| Personal= {{#tag:tabber| Zi-O= {{#tag:tabber| Zi-O= {{#tag:tabber| 1={{Quote|(Digital beeping) Zi-O!|Activation announcement |Kamen Rider Zi-O}} {{!}}-{{!}} 2={{Quote|{{nihongo|The clock Rider who uses Ridewatches to fight is... (Clock ticking noise) Zi-O!|ライドウォッチで戦う、時計のライダーは…ジオウだ!|Raidowotchi de tatakau tokei no Raidā wa... (Clock ticking noise) Jiō da!|}}|Secondary activation announcement|Kamen Rider Zi-O}} {{!}}-{{!}} 3={{Quote|Time Mazine!|Time Mazine summoning announcement|Kamen Rider Zi-O}} {{!}}-{{!}} 4={{Quote|Rider Time! Kamen Rider Zi-O!|Transformation announcement |Kamen Rider Zi-O}} {{!}}-{{!}} 5={{Quote|Finish Time! Time Break!|Finisher announcement|Kamen Rider Zi-O}} }}
 * {{nihongo|Zi-O Ridewatch|ジオウライドウォッチ|Jiō Raidowotchi}}: The personal Ridewatch of Kamen Rider Zi-O accesses his default form. It is dated 2018 AD.

{{-}} }}

Unused Ridewatches
The DX Ziku-Driver toy can be hacked via pin combinations to reveal the names of possible Ridewatches with no confirmation on their appearance in the show, listed as follows:

Portrayal
The Ridewatches are voiced by Rikiya Koyama (小山 力也), who previously voiced Paradox Roidmude in Kamen Rider Drive: Surprise Future, Kamen Rider Bujin Gaim in Kamen Rider × Kamen Rider Gaim & Wizard: The Fateful Sengoku Movie Battle and physically portrayed Joe the Haze in Kamen Rider Black RX. He also voiced other equipment in Kamen Rider Zi-O, and Oma Zi-O himself.