Shimano RD-M3100 Alivio 9sp Rear DerailleurShimano's Alivio derailleur uses trickle down technology to offer consistent and crisp 9-speed shifting performance. With the low profile SHADOW derailleur design you'll be able to ride harder with fewer derailleur issues overall. So whether you're searching for a replacement derailleur or are building up a new bike, the Alivio rear derailleur is a great choice. FeaturesAdjustment barrel is easily accessibleSHADOW design makes the derailleur lower profileTotal capacity: 45TMax low sprocket: 36T, Min low sprocket: 32TCompatible with Alivio 9-speed shifters | Shimano | RD-M3100 Alivio 9sp Rear Derailleur 9 SPEED SGS