Train and race with precise, dual-sided power data straight from your cranks. The Shimano Ultegra FC-R8100-P brings genuine left-and-right leg measurement to your 12-speed road bike, so you can see exactly where your watts come from and build a smarter, more efficient pedal stroke.

Highlights

  • True dual-sided power measurement reads each leg independently for accurate left/right balance
  • Integrated, waterproof rechargeable battery delivers a long ride time between charges
  • Wireless ANT+ and Bluetooth LE connectivity pairs with most head units, apps and trainers
  • HOLLOWTECH II forged aluminium crank arms for proven stiffness and low weight
  • 52-36T semi-compact gearing with 170 mm crank arms suits all-round road riding

Power you can trust

Strain gauges bonded to both crank arms measure force on the left and right sides separately, giving you per-leg balance and force-vector data to refine your pedalling. Active temperature compensation keeps readings stable as conditions change, and a quick zero-offset calibration gets you ready to ride in seconds.

Built to ride and forget

The sealed, waterproof design houses a rechargeable lithium-ion battery good for hundreds of hours of riding, so there are no coin cells to chase. Recharge via the supplied magnetic charger and head out in any weather.

Ultegra performance

This is the same HOLLOWTECH II crankset that anchors the Ultegra R8100 groupset, with a 24 mm steel spindle and forged aluminium arms for a stiff, responsive feel that transfers your effort straight to the road.

Compatibility & fit

Designed for Shimano 12-speed (2x12) road drivetrains. It uses a 24 mm HOLLOWTECH II spindle and requires a compatible Shimano HOLLOWTECH II bottom bracket for a 68 mm (or 70 mm) threaded shell; confirm your frame's bottom bracket standard before fitting. Chainline is 44.5 mm with a 148 mm Q-factor. Chainrings use the Ultegra/Dura-Ace 12-speed 4-bolt asymmetric 110 mm BCD pattern. Pair with the Shimano Connect Lab app or a compatible ANT+/Bluetooth LE head unit to view and record your data.

Shimano components carry a manufacturer's warranty against defects in materials and workmanship. Electronic power-meter components, including the integrated battery, are covered against manufacturing defects; the warranty does not cover normal wear, crash or impact damage, improper installation, or water ingress caused by damage. Retain your proof of purchase.

For warranty support, return the item to Tune Cycles and we'll manage the claim for you.

This warranty is in addition to your rights under the Australian Consumer Law. Our goods come with guarantees that cannot be excluded under the Australian Consumer Law. You are entitled to a replacement or refund for a major failure and to compensation for any other reasonably foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure.

  • Dual-sided power meter measuring left and right legs independently
  • Left/right balance and force-vector data for pedal-stroke analysis
  • Maximum measurement deviation of ±2.0%
  • Active temperature compensation for stable accuracy
  • Integrated, waterproof rechargeable lithium-ion battery
  • Up to 300+ hours of ride time per charge
  • Wireless ANT+ and Bluetooth LE connectivity
  • Quick, easy zero-offset calibration
  • HOLLOWTECH II forged aluminium crank arms
  • 24 mm steel spindle
  • 52-36T semi-compact chainrings, 170 mm crank arms
  • Works with the Shimano Connect Lab service
BrandShimano
SeriesUltegra R8100
ModelFC-R8100-P
TypeDual-sided power meter crankset (HOLLOWTECH II)
Speeds12-speed (2x12) road
Crank arm length170 mm
Chainrings52-36T
Chainring BCD110 mm, 4-bolt asymmetric
Chainline44.5 mm
Q-factor148 mm
Spindle24 mm steel
Bottom bracket shell68 / 70 mm (HOLLOWTECH II BB required)
Crank arm materialForged aluminium
Measurement accuracy±2.0% maximum deviation
MeasurementDual-sided (independent left/right)
BatteryIntegrated rechargeable lithium-ion (waterproof)
Ride timeUp to 300+ hours per charge
ConnectivityANT+ and Bluetooth LE
SKU SHM-IFCR8100PCX26F
Barcode # 4550170821234
Brand Shimano

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