Shimano XT M8120 Boost Crank

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Features:

- Special MTB gear teeth profile improves chain engagement and retention
- Hollow forged crank maximizes power transfer while limiting weight


Benefit:

- Superior chain retention
- Rigid and lightweight design for aggressive trail riding


Specifications:

- Average weight: 660 g (36T), 642 g (34T), 628 g (32T), 630 g (30T), 616 g (28T)
- Chain line (mm): 55
- Chain ring combination: 28T, 30T, 32T, 34T, 36T
- Compatible BB type_Outboard: yes
- Compatible BB type: Outboard
- Compatible chain: HG 12-speed
- Crank Arm Length: 165 mm, 170 mm, 175 mm, 180 mm
- Crank fixing bolt included: yes
- Crank arm length (mm)_165.0: yes
- Crank arm length (mm)_170.0: yes
- Crank arm length (mm)_175.0: yes
- Crank arm length (mm)_180.0: yes
- Gear arms: 4 arm
- HOLLOWTECH II: yes
- Optional chain guard_Without chain / bash guard: yes
- Optional Chain Guard: Without chain/bash guard
- P.C.D. (mm): Direct
- Rear speeds: 12
- Recommended BB_Pressfit: BB-MT800-PA
- Recommended BB_Threaded (normal): BB-MT800
- Threaded BB shell width_68mm: yes
- Threaded BB shell width_73mm: yes
- Threaded BB Shell Width: 68 mm, 73 mm
- Q-factor (mm): 178


Technology:

Special gear teeth function:
- Shimano’s dynamic chain engagement+ is a special gear teeth profile designed for use in single-chainring configurations for XC, enduro, and trail riding. It gives more chain retention and smoother pedaling - even over bumpy terrain. Chain retention of any gear will reduce abrasion and worn out.

Hollowtech:
- Providing the best balance of stiffness, strength, weight and rotating performance
The concept of HOLLOWTECH II technology is focused on producing a superior crankset which will maximize a rider’s power transfer. The rigidity of the crankset ensures pedaling efficiency while its weight, a key element of the crankset, you want light, aids in cycling longer distances over which the rider needs to pedal more. Naturally, SHIMANO strove for the optimum balance between the conflicting needs of stiffness while producing a lightweight crank. HOLLOWTECH technology is an ultra-lightweight hollow crankarm created by SHIMANO with the company’s own proprietary forging technology that also maintains rigidity. The addition of HOLLOWTECH II technology integrates the bottom bracket axle with the right crankarm for more stiffness and a weight savings to achieve a high-dimensional balance. Its outboard bottom bracket bearing system provides better weight distribution and more pedaling stability, allowing for more efficient power transfer.
The HOLLOWTECH II crankset has been developed by pursuing the optimum balance of stiffness & rotating performance in a lightweight and beautiful crankset design. High Precision Sealing Moreover, HOLLOWTECH II crankset has a high-precision sealing in the bearing area to increase durability maintaining the excellent rotating performance for long periods.




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