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.

Features

* 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)