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R9 RD-R42 / RD-R42S (9/10 SP)
- Rear derailleur.
- Road bikes.
- Model No.: RD-R42 or RD-R42S.
- Cassette Compatibility: 10 / 9 Speed.
- Cage Type: Long Cage (RD-R42) / Short Cage (RD-R42S).
- Front Chain ring: Triple (RD-R42) / Double (RD-R42S).
- Max. S
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