Train and race with reliable, dual-sided power data straight from your cranks. The Shimano Ultegra FC-R8100-P puts a precision power meter inside a proven Hollowtech II crankset, so you see true left and right effort without bolt-on pods or magnets to manage. This is the 170 mm crank arm supplied without chainrings, ideal for a custom build or when you already have the rings you want.

Highlights

  • Built-in dual-sided power meter measures each leg independently for accurate left/right balance
  • High measurement accuracy of plus or minus 1.5 per cent across the calibration range
  • Integrated rechargeable lithium-ion battery with up to 300-plus hours of ride time per charge
  • Wireless ANT+ and Bluetooth LE so it pairs with most head units, watches and training apps
  • Waterproof construction designed to keep performing in rain and grime
  • Lightweight aluminium Hollowtech II crank arms for stiff, efficient power transfer

Accurate, race-ready power

The power meter is integrated into both crank arms, so it reads each leg on its own rather than estimating one side from the other. You get true left/right balance, cadence, torque effectiveness and pedalling smoothness to guide your training, with active temperature compensation keeping readings consistent as conditions change.

Charge once, ride for months

A sealed, rechargeable lithium-ion battery is built in, giving up to 300-plus hours of riding between charges. There are no coin cells to swap and no exposed battery doors, which keeps the unit fully waterproof. Firmware updates and settings are handled through Shimano's E-Tube Project app.

Proven Hollowtech II crank

Underneath the electronics sits a genuine Ultegra-grade Hollowtech II crankset with hollow-forged aluminium arms for an excellent stiffness-to-weight ratio. The 24 mm steel axle and outboard bearing layout deliver the crisp, direct feel road riders expect from the Ultegra family.

Compatibility & fit

  • Crank arm length: 170 mm
  • Speeds: 2 x 12-speed road
  • Supplied without chainrings; uses Ultegra R8100 series 110 mm BCD 4-arm asymmetric chainrings
  • Spindle: 24 mm Hollowtech II steel axle
  • Bottom bracket: Hollowtech II compatible (sold separately)
  • Chainline 44.5 mm, Q-factor 148 mm
  • Wireless output: ANT+ and Bluetooth LE

Add the chainrings and bottom bracket that suit your build, or contact us if you would like help selecting compatible parts.

This Shimano Ultegra FC-R8100-P power meter crankset is covered by Shimano's manufacturer warranty against defects in materials and workmanship. The warranty covers manufacturing faults; it does not cover normal wear, crash or impact damage, improper installation, or damage from unauthorised modification or service.

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 integrated power meter with independent left/right leg measurement
  • Measurement accuracy of plus or minus 1.5 per cent across the calibration range
  • Reports power, left/right balance, cadence, torque effectiveness and pedalling smoothness
  • Integrated rechargeable lithium-ion battery, up to 300-plus hours per charge
  • Wireless ANT+ and Bluetooth LE connectivity
  • Active temperature compensation for stable readings
  • Fully waterproof construction
  • Lightweight hollow-forged aluminium Hollowtech II crank arms
  • Firmware and settings managed via Shimano E-Tube Project app
  • Supplied without chainrings for custom builds
BrandShimano
SeriesUltegra R8100
ModelFC-R8100-P (power meter)
Crank arm length170 mm
Speeds2 x 12-speed
ChainringsNot included (without chainring)
BCD110 mm, 4-arm asymmetric
Chainline44.5 mm
Q-factor148 mm
Spindle24 mm Hollowtech II steel axle
Bottom bracketHollowtech II compatible (sold separately)
Crank arm materialAluminium (hollow-forged)
Power measurementDual-sided, independent left/right
Accuracy± 1.5%
BatteryIntegrated rechargeable lithium-ion
Battery lifeUp to 300+ hours per charge
ConnectivityANT+ and Bluetooth LE
Water resistanceWaterproof construction
SKU SHM-IFCR8100PCXXF
Barcode # 4550170821135
Brand Shimano

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