With the Shimano Dura-Ace CS-7900 Cassette 10-spd, shifting has been further improved by creating an even more rigid (and lighter) aluminum carrier unit along with re-engineered teeth profile. Cassette design is lighter as Shimano has developed a super lightweight and rigid aluminum cassette sprocket carrier. The largest four cogs are titanium.
Gear Ranges: 11-21, 11-23, 11-25, 11-27, 11-28, 12-23, 12-25, 12-27,
Weight: 163 g. (11-23)
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