Train and race with precise, dual-sided power data straight from the cranks you already trust. The Shimano Ultegra FC-R8100-P puts a fully integrated, dual-leg power meter inside the proven R8100 Hollowtech II crankset, so you get accurate left/right numbers without bolting on extra hardware or sacrificing Ultegra shifting performance.

Highlights

  • True dual-sided measurement reports left and right leg power independently for balance and pedalling insight
  • Accurate to within +/- 2.0%, with automatic temperature compensation and quick zero-offset calibration
  • Integrated, waterproof, rechargeable Li-ion battery delivers 300+ hours of ride time between charges
  • Dual ANT+ and Bluetooth LE connectivity pairs with head units, watches and training apps
  • 52-36T semi-compact chainrings on 172.5 mm arms for a versatile road gear range
  • Built on the genuine Ultegra R8100 Hollowtech II crank, not an aftermarket conversion

Power you can rely on

Sensors in both crank arms measure each leg separately, so you see real left/right balance instead of an estimate doubled from one side. The unit compensates for temperature changes in real time and calibrates with a fast zero-offset, helping your numbers stay consistent ride after ride.

Charge once, ride for months

The rechargeable lithium-ion battery is sealed inside the spider for a clean look and reliable wet-weather performance. With 300+ hours of ride time per charge, most riders top it up only occasionally, and it recharges via the supplied cable.

Genuine Ultegra performance

Hollowtech II aluminium arms and Shimano's chainring tooth profiles keep the crisp, efficient front shifting Ultegra is known for. The 52-36T pairing suits everything from flat-out racing to long climbs.

Compatibility & fit

  • Designed for 2x12-speed Shimano road drivetrains
  • Fits 24 mm Shimano Hollowtech II road bottom brackets (bottom bracket sold separately)
  • Chainline 44.5 mm; Q-factor 148 mm
  • 110 mm asymmetric 4-bolt BCD
  • Arm length 172.5 mm; chainrings 52-36T
  • Use with a Shimano 12-speed road chain

Shimano components are covered by a manufacturer's warranty against defects in materials and workmanship. Power meter electronics, including the battery and sensors, are covered under Shimano's standard component warranty terms applicable in Australia. The warranty does not cover normal wear (such as chainring wear), crash damage, improper installation, or unauthorised modification.

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 leg power independently
  • Accuracy within +/- 2.0% with real-time temperature compensation
  • Quick, easy zero-offset calibration
  • Integrated, waterproof, rechargeable Li-ion battery
  • 300+ hours of ride time per charge
  • ANT+ and Bluetooth LE wireless connectivity
  • Built on genuine Ultegra R8100 Hollowtech II crankset
  • Aluminium crank arms with Shimano chainring tooth profiles for fast front shifting
  • 52-36T semi-compact chainrings, 172.5 mm crank arms
SeriesShimano Ultegra R8100
ModelFC-R8100-P (power meter)
Speeds2x12-speed (road)
Chainrings52-36T
Crank arm length172.5 mm
BCD110 mm, asymmetric 4-bolt
Chainline44.5 mm
Q-factor148 mm
Crank arm materialAluminium (Hollowtech II)
Spindle / bottom bracket24 mm, Shimano Hollowtech II road
Power measurementDual-sided (left/right independent)
Accuracy+/- 2.0%
BatteryIntegrated, waterproof, rechargeable Li-ion
Battery life300+ hours of ride time
ConnectivityANT+ and Bluetooth LE
SKU SHM-IFCR8100PDX26D
Barcode # 4550170172817
Brand Shimano

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