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more comfortable and robust
Aluminum Cassette Technology Hyperglide+ Cassette Weight 534g Cog Details 10-12-14-16-18-21-24-28-33-39-45-51 Cog Material Steel/Aluminum Finish Nickel plated Range 10-51T Speed 12
Primary Color Chrome Speed 12/13 e-Bike approved Yes
and comes with a PVD coating for unbelievable resistance to corrosion and wear
Ultegra CS-R8101 Pneus more comfortable and robustLight alloy sprocket carrier 12 speed compatible Attributes Cassette Spider Mat. Aluminum Cassette Technology Hyperglide+ Cog Material Steel Finish Nickel plated Speed 12 Cassette Freehub Compatibility HG+ 12sp Road ONLY