The PC-1170 is slightly narrower than its forebear, to comply with the smaller tolerances required by an 11-speed cassette. It also has hollow pins, which save 20g of weight without decreasing strength, and has new inner and outer finishes for improved smoothness. Of course, it also comes with SRAM's legendary PowerLink, which makes chain removal and drivetrain cleaning as easy as pie. The PC-1170 also ships with a pre-applied coating of SRAM's PowerLube, so it's ready to ride straight out of the box.