Shimano CS-7900 Dura Ace Cassette

The Shimano Dura Ace CS-7900 cassette provides you with a wealth of gearing options unlike any previous generation of Dura Ace. You get an unprecedented 8 different ratios to choose from -- 11-21, 11-23, 11-25, 11-27, 11-28, 12-23, 12-25, and 12-27. The low 6 cogs are steel, and the high 4 cogs are made from titanium. Compared to the CS-7800 cassette, you get a weight savings of 10g (e.g. the 11-23 weighs 163g).

The actual weight of the Shimano Dura Ace 7900 Cassette is: 11-21 is 157g. 11-25 is 179g. 11-27 is 186g. 11-28 is 190g. 12-23 is 192g. 12-25 is 186g. 12-27 is 193g.

Two brand-new ratios for Shimano with the Dura Ace CS-7900 cassette are 11-25 and 11-28.

The 11-21 includes- 11,12,13,14,15,16,17,18,19,21
The 11-23 includes- 11,12,13,14,15,16,17,19,21,23
The 11-25 includes- 11,12,13,14,15,17,19,21,23,25
The 11-27 includes- 11,12,13,14,15,17,19,21,24,27
The 11-28 includes- 11,12,13,14,15,17,19,21,24,28
The 12-23 includes- 12,13,14,15,16,17,18,19,21,23
The 12-25 includes- 12,13,14,15,16,17,19,21,23,25
The 12-27 includes- 12,13,14,15,16,17,19,21,24,27