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Featuring four titanium cogs, the new Dura-Ace 7900 cogset has further improved shifting quality by creating a more rigid aluminum carrier unit along with a re-engineered tooth profile. Shimano also successfully reduced the weight of the rear wheel assembly by 10 grams.

Technical Documents
Features
  • Revised gear sprocket design | Precise & reliable shifting
  • 8 cassette combinations | To accommodate more cyclists
  • Rigid aluminum carrier | Lightweight & rigid
  • Four titanium sprockets | Lightweight
  • Weight: 163.2g (11-23T)
  • NOTE: CS-7900 11-27 and 11-28 require the use of RD-7900 or RD-6700
Specifications
Model Number CS-7900
Series DURA-ACE
Alloy Sprocket Carrier yes
Number of Sprockets 10-speed
Sprocket Material steel/titanium
Sprocket Finish nickel plated & titanium
Chain Compatibility Super Narrow HG for 10-speed
Average Weight 163g (11-23)
Cassette Options 8
Option 1 11-21T
Sprocket Sizes 11-12-13-14-15-16-17-18-19-21
Titanium Sprockets 17-18-19-21
Option 2 11-23T
Sprocket Sizes 11-12-13-14-15-16-17-19-21-23
Titanium Sprockets 17-19-21-23
Option 3 11-25T
Sprocket Sizes 11-12-13-14-15-17-19-21-23-25
Titanium Sprockets 19-21-23-25
Option 4 11-27T
Sprocket Sizes 11-12-13-14-15-17-19-21-24-27
Titanium Sprockets 19-21-24-27
Option 5 11-28T
Sprocket Sizes 11-12-13-14-15-17-19-21-24-28
Titanium Sprockets 19-21-24-28
Option 6 12-23T
Sprocket Sizes 12-13-14-15-16-17-18-19-21-23
Titanium Sprockets 18-19-21-23
Option 7 12-25T
Sprocket Sizes 12-13-14-15-16-17-19-21-23-25
Titanium Sprockets 19-21-23-25
Option 8 12-27T
Sprocket Sizes 12-13-14-15-16-17-19-21-24-27
Titanium Sprockets 19-21-24-27