The Specialized CRK Dura-Ace 172.5 mm crank arm (non-drive side) includes a dual-sided 4iiii power meter and matches Shimano Dura-Ace 9100/9200 series spindle interfaces. Crafted from alloy and designed for left-side installation, it features a 24 mm axle interface with a typical 146 mm Q-factor and provides accurate power readings for both legs using the 4iiii dual sensor system.

• Compatible models: Shimano Dura-Ace 9100/9200 series cranksets

• Crank arm length: 172.5 mm

• Power meter: 4iiii dual-sided system on non-drive side

• Spindle interface: Shimano 24 mm axle

• Q-factor: approximately 146 mm

• Material: forged alloy crank arm

• Battery: replaceable coin cell (internal to 4iiii)

• Ideal for: accurate left/right power measurement with Shimano road systems