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New in Retail Box Only Compatible With SL-M9100 11/12 Speed Shift Lever FEATURE Optimized for new drive system 10-45T (12-speed) 10-45T (11-speed) Decreased rear derailleur tension at low gear position, to prevent high chain tension at low gear Add bumper at rear derailleur pulley cage Bigger 13T pulley 28 mm better ground clearance (vs. RD-M9100-SGS) BENEFIT .