Train and race with accurate, dual-sided power straight from your cranks. The Shimano Ultegra FC-R8100-P brings true left-and-right leg measurement into the proven Hollowtech II platform, so you see exactly where your watts come from without bolting on extra hardware. This is the 172.5 mm crank-arm version in the standard series colour, supplied without chainrings so you can fit the gearing that suits your riding.

Highlights

  • Dual-sided power meter measures left and right leg output independently for true left/right balance
  • Built on the stiff, lightweight Ultegra Hollowtech II crank for efficient power transfer
  • Rechargeable, fully sealed battery delivers long ride time between charges
  • Sends data over both ANT+ and Bluetooth LE to head units, watches and training apps
  • 172.5 mm crank arms; supplied without chainrings so you choose your own gearing

Accurate, balanced power data

Strain gauges in each crank arm capture both legs separately, so you get genuine left/right balance rather than a doubled single-side estimate. Active temperature compensation keeps the readings consistent as conditions change through a ride, with a stated measurement accuracy of +/- 2.0%.

Ride longer between charges

An integrated, waterproof rechargeable lithium-ion battery offers more than 300 hours of ride time depending on your ANT+/Bluetooth LE settings, so you can go weeks between top-ups instead of swapping coin cells.

Proven Ultegra crank

The FC-R8100-P uses the Ultegra Hollowtech II aluminium crank for a stiff, light foundation that puts your effort into the road. The power electronics are integrated into the arms, keeping the clean lines and reliability you expect from the R8100 series.

Compatibility & fit

  • 2 x 12-speed Shimano road drivetrains
  • 110 mm 4-bolt asymmetric BCD; supplied without chainrings (add your preferred 2x road rings)
  • 24 mm Hollowtech II spindle; requires a compatible 24 mm Shimano bottom bracket
  • Chainline 44.5 mm, Q-factor 148 mm
  • Broadcasts on ANT+ and Bluetooth LE for compatible head units, watches and apps

Shimano components carry a manufacturer's warranty against defects in materials and workmanship. Power meter electronics and the integrated battery are covered against manufacturing faults for the applicable Shimano warranty period. The warranty does not cover normal wear, crash damage, improper installation, or damage from 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 the consumer guarantees provided under the Australian Consumer Law. Our goods come with guarantees that cannot be excluded under the Australian Consumer Law.

  • Dual-sided power meter with independent left/right leg measurement
  • Stated accuracy of +/- 2.0% with active temperature compensation
  • Integrated, waterproof rechargeable lithium-ion battery
  • 300+ hours of ride time depending on ANT+/Bluetooth LE settings
  • Dual ANT+ and Bluetooth LE wireless transmission
  • Ultegra Hollowtech II aluminium crank for stiffness and low weight
  • 172.5 mm crank arm length, standard series colour
  • Supplied without chainrings for flexible gearing choice
ModelShimano Ultegra FC-R8100-P
TypeDual-sided power meter crankset (Hollowtech II)
Speeds2 x 12-speed
Crank arm length172.5 mm
Crank arm materialAluminium
ChainringsNot included
BCD110 mm, 4-bolt asymmetric
Spindle diameter24 mm (Hollowtech II)
Chainline44.5 mm
Q-factor148 mm
Power measurementDual-sided (independent left/right)
Accuracy+/- 2.0%
BatteryIntegrated rechargeable lithium-ion (waterproof)
Battery life300+ hours (depending on ANT+/Bluetooth LE settings)
ConnectivityANT+ and Bluetooth LE
Bottom bracketCompatible 24 mm Shimano bottom bracket (sold separately)
ColourSeries colour
SKU SHM-IFCR8100PDXXF
Barcode # 4550170821210
Brand Shimano

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