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This is a genuine MIYOTA fourth wheel for the 8200 movement, made in Japan, designed for the 8200 series automatic calibers (8200/8205/8215, etc.). Positioned between the third wheel and the seconds wheel, it serves as the key reduction and power transmission component in the gear train, delivering power to the seconds wheel and escapement as a critical link in timekeeping accuracy. This product is brand new and original, not a generic replacement part.
Brand：MIYOTA (by CITIZEN)
Compatible Movement：8200 / 8205 / 8215 and other 8200 series automatic calibers
Part Name：Fourth Wheel (Seconds Drive Wheel)
Origin：Made in Japan
Quality：Genuine original, brand new
Function：Power reduction and transmission (connects third wheel to seconds wheel, drives escapement)
1. Is this fourth wheel an original CITIZEN/MIYOTA genuine part?
Yes. It is an original MIYOTA factory part, made in Japan. The 8200 series was introduced in the mid-1970s and is MIYOTA’s most widely used mechanical movement, with nearly 50 years of continuous production.
2. Which movements is this fourth wheel compatible with?
It fits MIYOTA 8200 series automatic calibers, including 8200, 8205, 8215, as well as compatible CITIZEN-branded models such as 8200A and 8210A. Verify your movement main plate is marked with one of these calibers.
3. What happens if the fourth wheel is damaged?
The fourth wheel is the key reduction and transmission component in the gear train. Damage can cause timekeeping errors, hand stoppage, or power transmission failure, severely affecting accuracy. The 8200 series uses an indirect center seconds design, where fourth wheel wear directly affects the smooth operation of the seconds hand. Timely replacement is recommended.
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