Shimano Ultegra FC-R8100-P Dual-Sided Power Meter Crankset

$997.00 USD

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The Shimano Ultegra FC-R8100-P combines dual-sided power measurement, premium HOLLOWTECH II construction and precise Shimano 12-speed shifting in a fully integrated road bike crankset designed for Australian cyclists seeking structured training data, clean aesthetics and race-ready performance.

Shimano Ultegra FC-R8100-P Features

Dual-sided measurement captures power independently from the left and right crank arms
ANT+ and Bluetooth Low Energy connectivity supports popular GPS bike computers and training platforms
Integrated rechargeable lithium-ion battery provides up to 226 hours of riding
Active temperature compensation helps manage changing environmental conditions
Available with 50-34T or 52-36T chainrings, plus crank-only options without chainrings

(more product details...)

Crank Arm Length (mm)

Tooth Count/Gear Ratio

SKU: FC-R8100-P-160
Barcode: 192790901619

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Series: Shimano Ultegra R8100

Product type: Integrated crank-based cycling power meter

Intended discipline:

Performance road cycling
Road racing
Triathlon
Time-trial training
Gran fondo and endurance cycling
Indoor training
Structured cycling workouts

Drivetrain compatibility: Shimano 2x12-speed road

Available chainring combinations:

50-34T
52-36T
Crankset without chainrings

Available crank lengths:

165mm
172.5mm
175mm

Measurement type: Dual-sided

Force measurement:

Independent left-side measurement
Independent right-side measurement

Number of strain sensors: 24

Manufacturer-claimed accuracy: Within ±2.0%

Cadence measurement: Frame-mounted magnet

Zero-offset calibration:

Performed using the transmitter control button
Performed through a compatible connected device

Temperature management: Active temperature compensation

Wireless communication:

ANT+ Bicycle Power
Bluetooth Low Energy Cycling Power
Shimano custom Bluetooth communication
Shimano E-Tube Ride compatibility
Shimano E-Tube Project compatibility

Recorded metrics can include:

Total power
Left and right power
Left-right power balance
Cadence
Battery status
Pedalling efficiency
Force-vector information when used with supported equipment and software

Battery type: Integrated rechargeable lithium-ion battery

Battery life: Up to 226 hours, depending on wireless settings and operating conditions

Rated battery voltage: 3.7V

Rated battery capacity: 0.66Ah

Rated battery energy: 2.442Wh

Charging cable: Shimano EW-EC300

Status indicator: Integrated LED

Control buttons: One

Firmware updates: Shimano E-Tube Project

The Shimano Ultegra FC-R8100-P integrates strain sensors into both crank arms, enabling the power meter to record force from each side of the rider’s pedal stroke. Unlike a single-sided power meter that measures one leg and doubles the result, this dual-sided system can display total output and left-right contribution separately.

A total of 24 proprietary strain sensors detects the minute deformation created in the crank arms as force is transferred through the pedals. The system processes this information and broadcasts power, cadence and balance data to a compatible GPS cycling computer, smartwatch or training application.

Active temperature compensation automatically adjusts the power calculation as component and ambient temperatures change. This is useful for Australian cyclists whose early-morning training rides can begin in cool conditions before temperatures rise significantly later in the session.

An integrated rechargeable lithium-ion battery eliminates the need for disposable coin cells. Shimano quotes up to 226 hours of operation, although actual battery life depends on Bluetooth and ANT+ settings, connected devices, temperature and usage. Charging is completed with the Shimano EW-EC300 cable, which is also used by compatible 12-speed Shimano Di2 equipment.

HOLLOWTECH II construction combines hollow-forged aluminium crank arms with an integrated 24mm axle. This design distributes pedalling loads through outboard bottom bracket bearings and is engineered to balance stiffness, strength, low weight and smooth rotational performance.

The HOLLOWGLIDE outer chainring uses a hollow profile to increase lateral rigidity without excessive weight. Greater chainring stiffness helps the front derailleur move the chain quickly and accurately, particularly during shifts made under moderate pedalling load.

The shortest option is available in the crank-only configuration without chainrings. It is suitable for riders who have been professionally fitted to shorter cranks, including smaller cyclists, triathletes seeking additional hip clearance and riders managing restricted hip or knee movement.

165mm

A popular short-crank option for performance road riding and triathlon. It may provide greater clearance at the top of the pedal stroke and make it easier to maintain an aerodynamic riding position.

172.5mm

A traditional performance-road option commonly fitted to medium and large road bikes.

175mm

A longer crank option suited to riders whose bike fit, mobility and pedalling characteristics support the additional crank length.

Crank length should be selected through a professional bike fit rather than rider height alone. Changing crank length can affect saddle height, hip angle, knee movement, cadence and overall riding position.

Available gearing

50-34T compact

The compact chainring combination offers the most accessible climbing range. It is the most versatile choice for endurance riders, recreational cyclists and anyone regularly tackling steep Australian climbs or long gran fondo courses.

52-36T mid-compact

This performance-focused combination provides a larger top gear for racing and fast bunch rides while retaining a more manageable inner chainring than a traditional 53-39T racing crankset.

Crankset without chainrings

Chainring-free versions allow riders to reuse compatible Shimano R8100 rings or purchase their preferred gearing separately. The correct Shimano 12-speed chainrings should be used to retain the intended shifting performance.

Key dimensions

Crank lengths: 160mm, 165mm, 170mm, 172.5mm and 175mm
Q-factor: 148mm
Chainline: 44.5mm
Axle diameter: 24mm
Chainring pitch circle diameter: 110mm asymmetric
Pedal thread: 9/16-inch

The Shimano Ultegra FC-R8100-P is best suited to committed road cyclists, racers, triathletes and endurance riders who already use, or are building, a Shimano 12-speed road bike and want fully integrated power measurement without changing their preferred pedals.

DC Rainmaker published a technical analysis of Shimano’s second-generation Dura-Ace and Ultegra power meters on 1 September 2021. The initial assessment highlighted the clean factory integration, rechargeable battery, broad wireless connectivity and Shimano’s revised approach to strain-gauge placement and crank manufacture. The Shimano Ultegra FC-R8100-P was considered a potentially compelling choice for cyclists wanting an integrated dual-sided power meter within a matching Shimano drivetrain.

Product Care

Clean regularly with mild bike-safe cleaner.
Avoid high-pressure washing around the bottom bracket area.
Inspect chainrings for wear, damaged teeth or poor chain engagement.
Replace the chain before excessive wear damages the chainrings.
Check crank fixing bolt torque during regular servicing.
Use compatible Shimano HG 12-speed chains for best shifting performance.
Inspect bottom bracket bearings if creaking, roughness or play develops.
Avoid harsh degreasers directly on bearings or seals.
Replace chainrings when front shifting performance noticeably declines.
Book a professional drivetrain service if shifting becomes noisy or inconsistent.

Warranty Information

Covered by Shimano manufacturer warranty against defects in materials and workmanship.
Normal wear, crash damage, incorrect installation, corrosion, chainring wear and misuse are generally not covered.
Professional installation is recommended for correct torque, bottom bracket setup and drivetrain adjustment.
Regular drivetrain servicing helps protect the crankset, chainrings, chain and cassette.

Product SKU

160 / Without Chainrings: FC-R8100-P-160
160 / 50/34T: FC-R8100-P-160-50-34
160 / 52/36T: FC-R8100-P-160-52-36
165 / Without Chainrings: FC-R8100-P-165
165 / 50/34T: FC-R8100-P-165-50-34
165 / 52/36T: FC-R8100-P-165-52-36
170 / Without Chainrings: FC-R8100-P-170
170 / 50/34T: FC-R8100-P-170-50-34
170 / 52/36T: FC-R8100-P-170-52-36
172.5 / Without Chainrings: FC-R8100-P-172
172.5 / 50/34T: FC-R8100-P-172-50-34
172.5 / 52/36T: FC-R8100-P-172-52-36
175 / Without Chainrings: FC-R8100-P-175
175 / 50/34T: FC-R8100-P-175-50-34
175 / 52/36T: FC-R8100-P-175-52-36

Barcode (GTIN/EAN)

160 / Without Chainrings: 192790901619
160 / 50/34T: 192790901619
160 / 52/36T: 192790901619
165 / Without Chainrings: 192790901602
165 / 50/34T: 192790901602
165 / 52/36T: 192790901602
170 / Without Chainrings: 192790900902
170 / 50/34T: 192790900902
170 / 52/36T: 192790900902
172.5 / Without Chainrings: 192790900988
172.5 / 50/34T: 192790900988
172.5 / 52/36T: 192790900988
175 / Without Chainrings: 192790900919
175 / 50/34T: 192790900919
175 / 52/36T: 192790900919

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