Since its introduction, XTR has held true to its original design philosophy of delivering
Incorporating the benefit of rigidity with minimal weight of the Hollowtech II combined bottom bracket and crankset system,
Patent-protectedchain ring design means unmatched shifting performance: Market standard front shifting performance (when combined with a Shimano front derailleur) is taken even further by the precision molding and machining of the composite carbon fiber and titanium middle chainring and greater rigidity of the outer chainring.
- Enhanced durability: The titanium teeth of the middle chainring along with Ni plated the double anodized chain interface surface of the outer ring combine to a conservative 100% increase in durability over prior generation XTR chainrings.
- More precise bearing adjustment: The new left hand crank arm mounting system provides a higher integrity solution that creates more precise bottom bracket bearing adjustment, extending the bearing life while keeping rotating resistance to a minimum.
- Lighter weight and more versatile: Even with all of the additional benefits over prior generations,
the new FC-M970shaves even more weight from the current model thanks to the composite carbon fiber / titanium middle chainring. The 44−32−22 rings also share the same bolt pattern as other popular Shimano cranksets such as XT and LX.