Shimano Ultegra 8100 Power Crank Arms

$1,325⁰⁰

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Shimano | SKU: IFCR8100PMXXA | Option: Black, 160mm

Pickup available at RA Cycles - Brooklyn

Usually ready in 24 hours

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Shimano Ultegra 8100 Power Crank Arms Info

The Shimano Ultegra 8100 Power Crank Arms bring dual-sided power measurement to the Ultegra 8100 groupset — delivered as crank arms only, so you can pair them with your existing chainring and build out your setup on your own terms. Accuracy sits within ±1.5%, and left-right balance data gives you a clearer picture of how your effort is actually distributed across each pedal stroke.

These arms use Bluetooth and ANT+ connectivity, making them compatible with a wide range of head units and training platforms. The battery is rated for over 300 hours of ride time and is waterproof, so charging interruptions and weather are rarely going to be your concern. Zero-offset calibration is straightforward — something you'll appreciate when you're standing in a parking lot before a ride rather than fiddling with software at home.

Shimano Ultegra 8100 Power Crank Arms Specs at a Glance

Measurement: Dual-sided power, ±1.5% accuracy
Connectivity: Bluetooth and ANT+
Battery life: Over 300 hours, waterproof
Crank arm lengths: 160mm, 165mm, 170mm, 172.5mm, 175mm
Compatibility: Shimano 12-speed groupsets (arms only — chainring sold separately)

THE ULTIMATE GUIDE TO CYCLING POWER METERS

Unlock the power of cycling power meters to elevate your training and performance. Our guide covers the different types of power meters—pedal-based, crank-based, and spider-based—helping you choose the best tool to track data, optimize training, and achieve your cycling goals with precision.