Train and race with precise, dual-sided power data straight from the crankset, with no clip-on pods or pedal swaps to manage. The Shimano Ultegra FC-R8100-P delivers race-proven Hollowtech II stiffness and shifting performance while measuring the effort of each leg independently, so every interval and every climb is backed by reliable numbers.

Highlights

  • True dual-sided measurement reads left and right legs independently for accurate power and left/right balance
  • Accurate to within +/- 2.0% with active temperature compensation for consistent readings in changing conditions
  • Integrated, waterproof, rechargeable Li-ion battery delivers over 300 hours of ride time per charge
  • Broadcasts on both ANT+ and Bluetooth LE to pair with head units, watches and training apps
  • Hollowtech II crank arms for stiff, efficient power transfer and crisp 12-speed front shifting
  • 52-36T semi-compact gearing in a 172.5 mm crank length

Power you can trust

Strain gauges bonded into each crank arm measure both legs separately, giving you genuine left/right balance rather than an estimate. With +/- 2.0% accuracy and built-in temperature compensation, the data stays consistent whether you are riding a cold dawn start or a hot afternoon criterium.

Ride longer between charges

The sealed, waterproof battery is built into the crankset and recharges over a magnetic cable, offering more than 300 hours of riding per charge so you can focus on training instead of swapping coin cells.

Proven Ultegra performance

Lightweight aluminium Hollowtech II crank arms keep the crankset stiff and responsive, supporting the precise, light front shifting Ultegra R8100 is known for. The 52-36T semi-compact rings suit fast group rides, racing and rolling terrain.

Compatibility & fit

  • For 2x12-speed Shimano road drivetrains
  • Hollowtech II 24 mm spindle; pairs with a Shimano road Hollowtech II threaded bottom bracket such as the SM-BBR60 (68/70 mm shells)
  • 110 mm 4-bolt asymmetric chainring mounting
  • Run with a Shimano 12-speed road chain (HG-X)
  • Connects to ANT+ or Bluetooth LE compatible computers, watches and apps

This Shimano Ultegra FC-R8100-P crankset is covered by Shimano's warranty against defects in materials and workmanship for the applicable warranty period from the date of purchase. The warranty covers manufacturing defects and does not cover damage caused by crashes, misuse, improper installation, normal wear of consumable parts (such as chainring teeth), 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 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
  • Accurate to within +/- 2.0% with active temperature compensation
  • Integrated, waterproof, rechargeable lithium-ion battery
  • Over 300 hours of ride time per charge
  • ANT+ and Bluetooth LE wireless connectivity
  • Hollowtech II aluminium crank arms for stiffness and efficient power transfer
  • 52-36T semi-compact chainrings
  • 172.5 mm crank arm length
  • 110 mm 4-bolt asymmetric chainring mounting
BrandShimano
SeriesUltegra R8100
ModelFC-R8100-P
TypeDual-sided power meter crankset
Speeds2 x 12-speed
Crank arm length172.5 mm
Chainrings52-36T
Crank arm materialAluminium
Spindle interfaceHollowtech II, 24 mm
BCD110 mm, 4-bolt asymmetric
Chainline44.5 mm
Q-factor148 mm
Power measurementDual-sided (independent left/right)
Accuracy+/- 2.0%
BatteryIntegrated, waterproof, rechargeable lithium-ion
Battery runtimeOver 300 hours
ConnectivityANT+ and Bluetooth LE
Recommended bottom bracketShimano road Hollowtech II threaded (e.g. SM-BBR60)
SKU SHM-IFCR8100PDX26F
Barcode # 4550170821203
Brand Shimano

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