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.
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.
|Compatible chain||HG-EV 11-speed/ HG-X11|
|P.C.D. left / right (mm)||110|
|Gear arms (pcs)||4|
|Crank arm length (mm)||160||X|
|Optional chain guard||With chain guard||-|
|Without chain guard||X|
|HOLLOWTECH crank arm||X|
|Compatible BB type||Outboard||X|
|Recommended BB||Threaded (normal)||SM-BBR60|
|Axle length of BB-UN / ES (mm)||Threaded (normal)||-|
|Threaded BB shell width (mm)||68||X|
|Spider arm cover||Material||-|
|Outer ring||Material||Aluminum/ GFRP|
|Outer / middle ring fixing bolt||Material||Stainless steel|
|Inner ring fixing bolt||Material||-|
|Crank fixing bolt included||X|
|Average Weight (170mm, w/o BB)||713.4 g (50-34T)
742.6 g (52-36T)
757.8 g (53-39T)