MODEL NO:RD-M5100-SGS SERIES:DEORE M5100 Series Low sprocket_Max.:51T Low sprocket_Min.:51T Max. front difference:0T Pulley_Sunken type pulley bolt:✔ Pulley_Teeth:13T Pulley cage:SGS Speeds:11 Top-Normal spring type_SHADOW RD+:✔ Top sprocket_Max.:11T Top sprocket_Min.:11T Total capacity:40T Rear speeds:11 MODEL NO:RD-M5120-SGS SERIES:DEORE M5100 Series Low sprocket_Max.:46T (1x10-speed) 42T (2x11/2x10-speed) Low sprocket_Min.:42T Max. front difference:10T Pulley_Sunken type pulley bolt:✔ Pulley_Teeth:11T Pulley cage:SGS Speeds:11/10 Top-Normal spring type_SHADOW RD+:✔ Top sprocket_Max.:11T Top sprocket_Min.:11T Total capacity:41T Package Including: - 1pcs RD-M5120-SGS DEORE Rear Derailleur or - 1pcs RD-M5100-SGS DEORE Rear Derailleur Note: Product without original box