To ensure flawless and reliable functionality even with oversized cassette sprockets, the shifting and derailleur precision was achieved through the design of a 12-speed chain that required extensive research and development efforts to make it as reliable and durable as an 11-speed chain, despite the reduced thickness compared to the latter. The new 12-speed Chorus groupset benefits from a new Chorus 12 chain that guarantees the same reliability and performance as the Super Record level, weighing only 241 grams for 110 links.