- 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
Specifications
| Model Number | FC-M660 |
| Series | SLX |
| Crank Construction | HOLLOWTECH II |
| Cassette Compatibility | 9-speed |
| Chain Compatibility | Super Narrow HG for 9-speed |
| 4-Arm Chainrings | yes |
| Cahainring Sizes | 44-32-22T/48-36-26T |
| Bolt Circle Diameter | 104/64mm |
| Crank Arm Length | 170/175mm |
| Crank Arms | forged aluminum / hollow type |
| Outer Chainring | aluminum |
| Middle Chainring | steel + composite (32T), aluminum (36T) |
| Inner Chainring | steel |
| Chainring Bolts & Nuts | aluminum (bolt), steel (nut) |
| Chain Guard | option |
| Chaincase Compatible | no |
| Bottom Bracket | included |
| E-type FD Compatible | yes (44T) |
| Chain Line | 50mm |
| BB Shell Width | 68/73mm |
| Average Weight | 889g including BB (44T) |
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