X.O-style links and polished cosmetic finish. Compatible with ESP (1:1 ratio) trigger and twist shifters . Di.R.T (Direct Route Technology) for light-effort shifting performance. Aluminum inner/outer links and B-knuckle with Grilon P-knuckle . Aluminum cage on medium/long and composite cage on short version. Hardened pivots and 11-tooth upper/lower pulleys.
1:1 shifter-to-derailleur actuation ratio for precise light-action indexing