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This is a genuine MIYOTA third wheel for the 5R21 movement, made in Japan, designed for the 5R21 quartz caliber. It serves as the key intermediate gear in the gear train, smoothly transmitting power from the center wheel to the seconds wheel for accurate timekeeping in this two-hand movement. This product is brand new and original, not a generic replacement part.
Brand：MIYOTA (by CITIZEN)
Compatible Movement：5R21 quartz caliber (two-hand, no date)
Part Name：Third Wheel
Part Number：017-131 / CIT017131
Origin：Made in Japan
Quality：Genuine original, brand new
Function：Power transmission from center wheel to seconds wheel
1. Is this third wheel an original CITIZEN/MIYOTA genuine part?
Yes. It is an original MIYOTA factory part with part number 017-131, made in Japan.
2. Which movements is this third wheel compatible with?
It fits the MIYOTA 5R21 quartz caliber (3¾×6 ligne size, approx. 9.00×13.50mm).
3. What happens if the third wheel is damaged?
The third wheel is the key intermediate gear in the gear train, positioned between the center wheel and the seconds wheel. Damage can cause timekeeping errors, hand stoppage, or power transmission failure. The 5R21 offers accuracy of ±20 seconds/month—third wheel precision directly impacts performance. Timely replacement is recommended.
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