2012 Shimano Dura Ace RD-7900 SS 10 Speed

Featuring unidirectional carbon  pulley plates and P-Body to reduce the overall weight, Shimano offers one of the best rear derailleurs on the market.  Its wide pivot link design increases stiffness and allows you to use a larger gear ratio.  Total weight of the derailleur is 166 grams.
 
• Wide link design for increased stiffness and better shifting accuracy
• Sealed bearing 11 tooth pulleys
• Carbon pulley plate for weight savings
• Enhanced cable pull method allows for a wider adjustable range for shifting and is less likely to be affected by external factors
• Wide gear-ratio compatibility allows gear ratios equivalent to a triple system without having to change to a GS rear derailleur
• 10 speed compatible
• Max rear sprocket: 28 tooth
• Max front difference: 16 tooth
• Total capacity: 33 tooth
• 166 grams
• UPC: 689228247420

Click here for Shimano Compatibility Chart