Shifting has been even further improved by creating an even more rigid (and lighter) aluminum carrier unit along with re-engineeredTeeth profile. Cassette design is lighter asShimano has developed a super lightweight and rigid aluminum cassette sprocket carrier withThe largest four cogs are made ofTitanium. 4 largest cogs areTi Updated design gear sprocket Super light weight yet rigid aluminum carrier Variety of gear combination Published weight 169 grams (11-25) Sizes11-25 (11-12-13-14-15-17-1
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