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Shimano Dura-Ace CS-7700 Sprocket Unit - 16-17T - 10R 9801

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For Shimano Dura-Ace CS-7700 9spd Cassettes, this sprocket unit should be used with the following cassette ratios:

- 11-21T
- 12-21T
- 12-23T

Cassette requires the Shimano TL-HG15 Lock Ring Removal Tool.

Genuine Shimano replacement part.
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