The Chorus groupset is fully compatible with the cassettes launched with the Super Record and Record 2x12-speed groupsets (11-29 and 11-32) and it introduces a new cassette specification (11-34) only compatible with our Chorus 12s drivetran. The new 11-34 cassette in fact offers cyclists even more versatility and greater choice and autonomy in terms of available gears.Same width as the 11-speed cassette Totally compatible with wheels and frames. The two bigger sets of three in a single-block piece It eliminates energy dispersion. Surface treatment It increases durability and improves smoothness. Same-thickness spacers Ensures error-free fitting.Specifications:- Weight: 310 grams- Combinations 11-29