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- 7075-T6 aluminum ring for Easton Cinch system Road/CX/Gravel cranks \n- Asymmetric four arm shape for greater stiffness in the power zones of the pedal stoke \n- Narrow-wide tooth profiling prevents chain drop with a guide or clutch derailleur\n- Compatible with 9/10/11 speed chains, mounts using a common Park BBT-22 tool\n- 47mm chainline with the Easton 129mm spindle\n- 38T (80g), 40T (91g), 42T (98g), 44T (105g), 46T (112g), 48T (123g), 50T (137g)