It's true. Competition drives innovation. The recent de-ringing of our cranksets is evidence of this. Double cranks like this Shimano XTR M985 Race Crankset are lighter than triple cranks. This one is 50 grams lighter than the M980 Trail version. It also shifts faster thanks to the simplification of just having two rings. Ultimately, it offers a narrower range of gears than the triple. However, some folks just like to shave any extra grams they can and go hammer down, and this simpler XTR crank is just the ticket to fly.
Like previous XTR cranks, it uses Shimano's cold forging process to create the hollow aluminum crankarms. This produces lighter and stronger parts than solid forgings. It saves a whopping 90 grams over the XT M785 double crankset. With this being the centerpiece of the beautiful XTR groupset, no expense is spared to create the best-looking and best-performing crank possible.
The hollow forging process isn't limited to the crankarms either. The big chain ring is hollow aluminum and super sexy á la Dura-Ace. While pretty, it is also lighter and stiffer, and the stiffer 3D shape makes for faster shifts and better transmission of power to the rear wheel. The chain ring shaping is optimized for use with Shimano's XTR HG-X 10-speed chain. The combo of revised notch and pin placement on the chain rings along with the asymmetrical shaping of the chain makes the front shifting better than ever.
The XTR M985 crank is lighter than the previous XTR M970 triple crank by 100 grams, and the design reverts back to the Shimano pinch bolt system to fix the left side crankarm to the splined Hollowtech II spindle. This means no more threaded preload collar. We like the pinch bolt design because it separates the bearing preload from securing the crankarm to the spindle. This way you can achieve the perfect bearing preload, then fix the crank to the spindle in a secure manner without affecting the smooth operation of the bottom bracket.
It's worth noting that this Shimano XTR M985 Race Crankset uses a proprietary 88mm bolt circle diameter. This means that only XTR double rings will fit. And for those of you who seek a narrow Q-factor, this XTR Race crank is 6mm narrower at the pedal threads than the XTR Trail crank.
The Shimano XTR M985 Race Crankset comes in 38/26 or 42/30 chain ring configurations. It comes with an XTR Hollowtech II English threaded bottom bracket. This double crank is perfect when performance is the first priority.
Shimano Xtr M985 Race Crankset
- Brand: Shimano
- Product Code: sg138
- Availability: In Stock