Model Number FC-M970
Series XTR
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/44-32-24T
Bolt Circle Diameter 104/64mm
Crank Arm Length 165/167.5/170/172.5/175/177.5/180mm
Crank Arms forged ultra duraluminum / hollow type
Outer Chainring aluminum
Middle Chainring Ti / CFRP
Inner Chainring aluminum
Chainring Bolts & Nuts aluminum
Chain Guard no
Chaincase Compatible no
Bottom Bracket included
E-type FD Compatible yes
Chain Line 50mm
BB Shell Width 68/73mm
Average Weight 770g including BB