The XTR Race M985 double-ring crank compliments race-day performance with a narrow Q-factor, unparalleled power transfer and CloseStep chain-rings to suit racer’s speed and style.

Features:

• CloseStep race gearing: 42-30T
• Dual Spike chain-ring technology
• 10-Speed specific
• 4 x 88mm bolt pattern
• 175mm crank length

Specifications:

Model Number -  FC-M980 
Series -  XTR 
Crank Construction -  HOLLOWTECH II 
Cassette Compatibility -  10-speed 
Chain Compatibility -  HG-X 10-speed 
88mm x 4-Arm Chainrings   
Chainring Sizes -  42-30T 
Bolt Circle Diameter -   4 x 88mm
Crank Arm Length -  175mm 
Outer Chainring -  Aluminum 
Inner Chainring -  Aluminium 
Chainring Bolts & Nuts -   Aluminium
Bottom Bracket -  SM-BB90-A 
E-type FD Compatible -  Yes 
Chain Line -  48mm
BB Shell Width -   68/73mm
Average Weight  - 642 grams (excluding BB (+90 grams)) 

About Dyna Sys:

Shimano has been making mountain bike drivetrains for more than three decades, including eight generations of Shimano Deore XT (the original MTB drivetrain) and six generations of its flagship XTR group. Each generation is a reflection of the riding that defined the sport and the technology that defined the era. True to this legacy, our next-generation Dyna-Sys drivetrain brings with it the legendary quality, durability and performance riders expect from Shimano, all packaged to meet the ever-evolving demands of today’s riders.

Through Dynamic Systems Engineering, Dyna-Sys brings together the rider, the bike and the trail. Intuitive gear combinations account for how riders deliver power through the drivetrain; optimization around the 32-tooth Primary Driving Gear lets riders get the most out of modern suspension designs, and even the roughest, rockiest, muddiest trails can’t shake Shimano’s most stable off-road drivetrain to date.

Dyna-Sys is more than another batch of iterative improvements—it is a comprehensive redesign made up of a multitude of thoughtful details, features and revisions that together add up to more than the sum of their parts.