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Shimano Tiagra 4700 10 Speed Rear Derailleur. Available in SS (short cage) for low gear 28T, or GS (medium cage) for low gear 34T.
Shimano 105 RD-5701 10 Speed Rear Derailleur. Available in SS (Short cage, max 30T), or GS (Long Cage, Max 32t when used with double).