Shimano's Dura-Ace 7900 makes two fundamental changes over the 7800 series. Firstly, Shimano has machines down the shifter boss to the utmost extreme, resulting in a drop of 17 grams. Secondly, Shimano has done away with the optional friction shifting, which eliminated an additional spring dropping the weight by an additional 11 grams.
- Only index shifting for the rear derailleur
- Compatible with 10-speed Shimano derailleurs
- 153 grams for the pair
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