The Shimano R7100 crankarms from the 105 group are the first choice 12-speed option for beginner cyclists, combining features of the best Ultegra and Dura-Ace models. The 105 model offers low weight, excellent construction, and high performance precision in all conditions, ensuring great enjoyment while riding and allowing full focus on training.

The crankarms match the performance of top-tier components used by professional riders, efficiently transferring power thanks to their high stiffness and are almost identical in design.

• Arm length: 175 mm
• Bolt circle diameter (P.C.D.): 110 mm
• Hollowtech II crankarm: 2-chainring
• Designed for: 12 speeds
• Color: Black
• Bottom bracket not included
• Chainline: 44.5 mm
• Q-factor: 148 mm

Technologies

The integrated arm and bottom bracket increase stiffness while keeping weight low. The wider bearing placement boosts stiffness, effectively transferring pedal power. The bearings operate with high precision, installation is very simple, and maintenance costs are very low.

The Hollowtech II technology concept focuses on creating the perfect crankarm that maximizes power transfer from the cyclist. The stiffness of the crankarm ensures pedal efficiency, while its weight—a critical factor—supports longer rides requiring continuous pedaling.

Shimano aims to achieve an optimal balance between stiffness and minimal crankarm weight. Hollowtech technology is applied to a super-light hollow arm created with Shimano’s patented forging technology, ensuring stiffness. The addition of Hollowtech II technology integrates the bottom bracket spindle with the correct arm to achieve stiffness and low weight, providing the right balance.

A lightweight crankarm not only reduces the bike's weight but also its rotational mass, resulting in greater acceleration. The challenge is to reduce the crankarm weight while maintaining strength and stiffness. Shimano’s advanced forging technology solves this issue with the Hollowtech arm, which offers excellent durability and stiffness while keeping weight low.