Shimano Ultegra 10-Speed RD6600 Rear Derailleur priced at $79.98. Wide outer link design increases rigidity.The SIS-SP41 cable housing, with silicon grease, reduces friction by 10%. 9and 10 speed compatible with a front difference of 14T and total capacity of 29T. 209grams.

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Specifications:

10 speeds w/ maximum sprocket size 27T and minimum of 11T.

Guide tension and no tension pulley w/sealed bearings.

Bracket body is aluminum/clear coated and bracket pivot seal has double O-rings.

Weight 209grams.