SLX Hollowtech II Cranksets feature hollow forged crank arms, durable pipe billet steel axles, and smooth shifting SG-X chainrings. Model FC-M660 features traditional MTB triple chainrings, while model FC-M665 features the new Mountain Compact Drive gearing (36-22) along with an integrated bash guard.
- Composite middle chainring offer double service life, improved shifting and smoother pedaling
- 2 tone colored crank arm
- High rigidity crank arm
- Accurate chainline construction by 2-piece structure
- Reinforced construction for extreme riding style
- Increased ground clearance
- Honeycomb designed bash guard absorbs impact