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Shimano SLX RD-M663 10-Speed Rear Derailleur

Tough, aggressive and light weight All-Mountain SLX rear derailleur using revolutionary features from XT and XTR at an affordable price point.

Shadow features a super low profile design that reduces the risk of damage from trail side hazards.

Single tension spring prevents contact with the chainstay resulting in a silent ride. Direct cable routing prevents snagging from any trail side hazards.

Alloy and steel construction leads to lower weight without compromising strength and durability. Two fluorine-coated link pin bushings aid slick shifting on the trails.

High rigidity wide outer link braces the pulley body to increase pivot joint rigidity resulting in a crisp shift. Strong return spring for a positive shifting feel.

Improved cable pull ratio provides a more accurate shift action making the system less prone to contamination and trail chatter

  • Dyna-Sys 10-speed compatible only
  • 43T capacity GS cage
  • Top normal spring uses the spring to select higher gears
  • Weight 274 grams