Gear Ranges: 11-21, 11-23, 11-25, 11-27, 11-28, 12-23, 12-25 or 12-27
Weight: 163 g. (11-23)
Shifting has been even 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 and weight is reduced by 10 grams.