Shimano Dura Ace R9200 12s Hollowtech Ii

DURA-ACE FC-R9200 crank, the heart of the bicycle, ensures that no portion of your pedal stroke is wasted. With hollow arms and chainrings, weight is kept to a minimum but stiffness and shifting precision is maximized.The DURA-ACE FC-R9200 crank performs two vital functions: transferring your pedaling effort into the drivetrain and ensuring the fastest, most precise front shifting available. With HOLLOWTECH II crank arms to ensure light weight and Shimano´s class-leading chainring designs, the FC-R9200 won´t let you down. The FC-R9200 is offered in even shorter crank arms lengths to offer fit options for any rider.- Optimal balance of stiffness, strength, weight and rotational performance- HOLLOWGLIDE structure cuts weight yet maintains strength for better power transfer and quicker, more precise front shifting- New 54-40T option to realize the most efficient drivetrainSpecifications:- Average weight: 685 (50-34T)- Threaded bottom bracket shell width (mm)_70: Yes- Chainring combination: 50-34T- Compatible bottom bracket type_Outboard: Yes- Crank fixing screw included: Yes- Crank arm length (mm)_160: Yes- Crank arm length (mm)_165: Yes- Crank arm length (mm)_167.5: Yes- Crank arm length (mm)_170: Yes- Crank arm length (mm)_172.5: Yes- Crank arm length (mm)_175: Yes- Crank arm length (mm)_177.5: Yes- Spider/Gear Arms: 4- Hollowglide: Yes- Hollowtech Ii: Yes- Hollowtech Crank Arm: Yes- Optional chain guard_Without chain/bash guard: Yes- Recommended bottom bracket_Press-fit: SM-BB92-41B- Recommended bottom bracket_Threaded (normal): BB-R9100- Threaded bottom bracket shell width (mm)_68: Yes- Q-factor (mm): 148- Chain line (mm): 44.5- Compatible chain: CN-M9100- P.C.D. (mm): 110- Rear speeds: 12Technology:Hollowglide:Hollow technology on outer chainring:- High rigidity hollow structure cuts down on weight yet maintains strength. Better power transfer and quicker and more precise front shifting.Hollowtech Crank Arm:- Hollow forged crank arms- A Lightweight Crankset Not Only Reduces The Bike'S Weight, But Decreases Rotating Mass To Aid In Acceleration.- The Challenge Is To Reduce The Weight Of The Crank Without Reducing Its Strength And Rigidity.- Shimano'S Advanced Forging Technology Has Solved The Problem Through The Hollowtech Crank.- Just like high quality frame tubing, a hollow crank arm can provide amazing strength and rigidity at very lightweight.Hollowtech II:- 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