Model Number FC-M391
Series Acera
Cassette Compatibility 9
Chain Compatibility Super Narrow HG for 9-speed
4-Arm Chainrings Yes
Crank Arm Length 170mm,175mm
Outer Chainring 44T / 48T
Middle Chainring 32T / 36T
Inner Chainring 22T / 26T
Chainring Bolts & Nuts Yes
Chain Guard Option
Chaincase Compatible Chain Case Compatible Crank Arm
Bottom Bracket BB-UN26(-K)
Chain Line 50.0
BB Shell Width LL123(-K)
