The Chorus crankset is a true concentration of technology and versatility. 

It is technically advanced because it uses unidirectional carbon fiber construction technology directly molded without any surface painting and uses the Ultra-Torque steel spindle like the Record crankset. 

It is versatile because its new 123 mm bolt circle diameter, while providing an extremely high-performance structure, ensures a wider variety of usage segments. 

Available in crank lengths of 165, 170, 172.5, and 175 mm, the new and reduced bolt circle diameter of the Chorus crankset makes it compatible with 52/36, 50/34 gears, and the brand-new 48/32 chainrings.

Features

Unchanged Q factor (145.5)
No change in dimensions or pedaling biomechanics.

Unidirectional carbon fiber crankarms, steel spindle, and aluminum gears
High stiffness and optimal power transfer.

Symmetrical teeth on the inner chainring
Smooth and precise transmission.

Optimized design for every combination
Maximum performance, always.

Double BCD
The outer chainring mounts directly onto the crank arm at a 123 mm BCD while the inner chainring is fixed to the outer one at a 96 mm BCD.

Surface treatment of the chainrings for longer durability.

Actual weight: 774 g (172.5 mm/36-52), 733 g (170 mm/34-50).