- Make sure this fits by entering your model number.
- Dyna-Sys 10 Speed compatibility
- Hollowtech II design includes bottom bracket (68/73mm)
- Hyperdrive SG-X chainrings
- Composite middle ring for extra durability and smoother shifting
- Shimano reference number: FC-M670
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The all-new Shimano SLX FC-M670 crank set is Dyna-Sys specific for a 10-speed mountain drivetrain. It features hollow-forged, 2-tone aluminum arms with a reinforced spider and an integrated, HollowTech-II (HT2) bottom-bracket spindle for improved power transfer. <p>The 3×10 Trail version, a 42/32/24 ratio, includes a wide-stance bottom bracket cupset with outboard bearings, which offers increased rigidity (fits both 68/73mm with included spacers) and is designed for a 50.0mm chainline.</p>