The Shimano FC-R8100 is a crankarm belonging to the new Ultegra series. It is compatible with all Shimano road groups in the 2x12 standard. Designed with Hollowtech II technology, it features an integrated disc axle and hollow aluminum arms that reduce weight, enhance the overall structure, and contribute to the more efficient transfer of power generated by the rider.

The discs are mounted via a four-arm, asymmetric fork, with no visible external bolts, improving appearance and aerodynamic properties. Alternatively, Dura Ace R9200 group discs can be used. Precise and quick gear shifting will surely enhance the riding experience. These special features will be appreciated by road cyclists and triathletes, where the quick response of the mechanism is an important factor.

Technologies: The Hollowtech II technology offers the best balance between stiffness, durability, low weight, and rotational performance. The crankarm's rigidity, thanks to the integrated axle, guarantees efficiency during pedaling, while its weight, a key element of the crankarm, supports longer riding distances. Shimano aims to achieve the optimal balance between stiffness and minimal crankarm weight. The ultra-light hollow crankarm employs Shimano's forging technology to provide stiffness. The external bearing system of the arm's bottom ensures better weight distribution, improved stability during pedaling, and more efficient power transfer, all integrated into a lightweight and sleek design.