Train and race with race-proven accuracy. The Shimano Ultegra FC-R8100-P is a dual-sided power meter built into a 175 mm Hollowtech II crankset, giving you true left and right leg power without sacrificing the stiffness, light weight and reliable shifting Ultegra is known for. This version ships without chainrings, so you can fit the ratio that suits your riding.

Highlights

  • Dual-sided measurement reads each leg independently for a real left/right balance, not an estimate
  • Integrated, waterproof, rechargeable battery delivers up to 300+ hours of ride time between charges
  • Sends data over both ANT+ and Bluetooth LE, so it pairs with virtually any head unit, watch or training app
  • Built on the proven Ultegra R8100 Hollowtech II crank for stiffness and efficient power transfer
  • Supplied without chainrings so you choose your own gearing

Power you can trust

Strain gauges bonded into each crank arm measure the force from both legs, giving you accurate, repeatable numbers ride after ride. Shimano rates the system to within ±2.0% across the calibration range, so your training zones and pacing stay consistent whether you are doing intervals or holding a long tempo.

Charge it and forget it

An integrated, fully sealed Li-ion battery means no coin cells to swap and nothing exposed to road spray. A single charge lasts well over 300 hours of riding, and you top it up with the Shimano EW-EC300 charging cable.

Connect to everything

Dual ANT+ and Bluetooth LE broadcasting lets you run the power meter with a cycling computer, smartwatch or indoor training app, and view detailed left/right metrics through the Shimano Connect Lab service.

Compatibility & fit

  • 2 × 12-speed Shimano road drivetrains (Ultegra R8100 / Dura-Ace R9200 generation)
  • 175 mm crank arm length
  • 24 mm Hollowtech II spindle; works with Shimano road bottom brackets such as SM-BBR60 (threaded) and SM-BB72-41B (press fit) for the matching shell
  • 110 mm 4-bolt asymmetric BCD — accepts Shimano 12-speed road chainrings (e.g. 50/34T or 52/36T), sold separately
  • 44.5 mm chainline, 148 mm Q-factor
  • Chainrings not included

Shimano components are covered by Shimano's manufacturer warranty against defects in materials and workmanship. Power meter electronics, including the integrated battery, are covered against manufacturing defects for the warranty period applicable to Shimano electronic components. Warranty does not cover damage from crashes, improper installation, modification, normal wear or general neglect.

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 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 built into the Ultegra R8100 Hollowtech II crankset
  • Measures left and right leg power independently for accurate balance data
  • Accurate to within ±2.0% across the calibration range
  • Integrated, waterproof, rechargeable Li-ion battery
  • Up to 300+ hours of ride time per charge
  • Recharges via Shimano EW-EC300 cable — no coin-cell batteries
  • Broadcasts on both ANT+ and Bluetooth LE
  • Compatible with the Shimano Connect Lab web service for detailed analysis
  • 175 mm crank arm length
  • 24 mm Hollowtech II spindle, 110 mm 4-bolt asymmetric BCD
  • Supplied without chainrings
BrandShimano
SeriesUltegra R8100
ModelFC-R8100-P
TypeDual-sided power meter crankset
Speeds2 × 12-speed
Crank arm length175 mm
Spindle24 mm Hollowtech II
BCD110 mm, 4-bolt asymmetric
Chainline44.5 mm
Q-factor148 mm
ChainringsNot included
MeasurementDual-sided (left and right)
Accuracy±2.0%
BatteryIntegrated, waterproof, rechargeable Li-ion
Ride timeUp to 300+ hours per charge
ChargingShimano EW-EC300 cable
ConnectivityANT+ and Bluetooth LE
Bottom bracketShimano road, e.g. SM-BBR60 (threaded) / SM-BB72-41B (press fit)
SKU SHM-IFCR8100PEXXF
Barcode # 4550170821173
Brand Shimano

More From This Category