Shimano Shimano Rear Derailleur 10sp RD-M663-SGS (SLX)

Super Long Cage Rear Derailleur

SLX features Shimano's Shadow design Rear Derailleurs for superior trail clearance and crisp shifting. Thanks to new, more direct cable routing and the reduced cable tension, Dyna-Sys is less sensitive to contamination, cable stretch and cable routing concerns, which all adds up to more consistent performance in even the roughest terrain—the kind of trails that rattle molars loose and make suspension components work overtime to keep pace.