- Improved lever shape
- Longer main lever and ergonomic touch points
- Positive index
- Improves rider feedback
- Easy access main lever
The Shimano Deore SL-M590 has 9-speed indexed shifting for crisp, precise gear changes and a responsive feel, a wide optical gear display for easier and more accurate shifting and an ergonomic thumb lever shape for comfortability.Features: 9-Speed indexed shifting for crisp, precise gear changes Wide optical gear display Ergonomic thumb lever Compatible with Shimano Deore rear derailleur