Shimano Dura Ace FC-R9200 Crankset 2X12V

Hollowglide

Hollow technology on the outer chainring; the high-stiffness hollow structure reduces weight while maintaining stiffness. More efficient power transfer and quicker, more precise chainring shifts.

Hollowtech

An ultralight crankset not only reduces the bike's weight but also reduces rotating mass, making accelerations easier. The goal is to reduce crankset weight without compromising durability and stiffness. Shimano's advanced forging technology solved this with the Hollowtech crankset. Like high-quality frame tubes, a hollow crank arm can provide incredible durability and stiffness with very low weight.

Hollowtech II

A perfect balance of stiffness, durability, weight, and efficiency. Hollowtech II technology is aimed at producing a superior crankset that maximizes power transfer. The crankset's stiffness ensures pedaling efficiency, while its lightness, a key element, helps the rider on long distances where more pedaling is required. Naturally, Shimano has worked hard to ensure a superlight and extremely stiff crankset, two conflicting goals. Hollowtech technology, consisting of an ultralight hollow crank arm that maintains stiffness, was developed by Shimano using its exclusive forging technologies. The addition of Hollowtech II technology integrates the bottom bracket axle with the right crank arm, ensuring greater stiffness, weight reduction, and high dimensional stability. The bottom bracket's axial bearing system ensures better weight distribution, resulting in more efficient power transfer. The Hollowtech II crankset was developed pursuing an optimal balance between stiffness and rolling performance, resulting in an ultralight and very elegant design.