The M6100 chain provides smooth shifting and enhanced chain retention thanks to an extended portion of the inner plate Extended inner plate improves chain engagement and retention Shorter shift times and less pedaling shock Non-reusable quick link included Optimized to work with HYPERGLIDE+ cassette sprockets and DYNAMIC CHAIN ENGAGEMENT+ chainrings Compatible with 12-speed drivetrain E-Bike Compatible: yes Links: choose; 126 links, or 138 links Quick Link Included: yes Roller Link Plate: brown Pin Link Plate: gray