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Shimano
Tiagra (RD-4600) Rear Derailleur
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Improved surface treatment
10/9 Speed
Lighter weight
Wide link design
SS model compatible with compact cranksets
Min cog: 11 T
Max cog: 30T
Front difference: SS: 16 T max, GS: 22 T max
Total capacity: SS: 34 T, GS: 39 T