Shimano XTR 10 speed FCM985 Hollowtech II Double Crankset.
The XTR Race M985 double-ring crank complements race-day performance with a narrow Q-factor, unparalleled power transfer and CloseStep chainring options to suit racers’ speed and style.

Specs
Model Number FC-M985
Series XTR
Crank Construction HOLLOWTECH II
Cassette Compatibility 10-speed
Chain Compatibility HG-X 10-speed
4-Arm Chainrings
Cahainring Sizes 42-30T
Bolt Circle Diameter
Crank Arm Length 175mm
Crank Arms
Outer Chainring Aluminum
Middle Chainring
Inner Chainring Aluminum
Chainring Bolts & Nuts
Chain Guard -
Chaincase Compatible -
Bottom Bracket SM-BB90-A
E-type FD Compatible Yes
Chain Line 48.8mm
BB Shell Width