(949) 535-3742
Shimano Ultegra R8100-P Dual-Sided Power Meter Crankset
August 15, 2025Price range: $1,325.00 through $1,465.00
Dual-sided power on a Shimano Ultegra R8100 crankset
We offer free shipping on orders in the U.S. of $75 or more.
We also ship fast! In stock orders placed before 4 pm PT almost always ship the same day!
Shop with confidence! We offer a simple, 30-day policy where you can return new, unused items for a refund, exchange or store credit.
Shimano Ultegra R8100-P Dual-Sided Power Meter Crankset
The Shimano Ultegra R8100-P Dual-Sided Power Meter Crankset offers dual-sided power on a factory Shimano crankset. With a proprietary strain gauge design and power sensors bonded to each crank arm, the Shimano power meter measures the precise pedaling forces of each leg individually. Therefore, you can see total power as well as your power balance. It also features active temperature compensation, which means it’s always accurate, even when the weather or riding conditions change.
With a rechargeable lithium-ion battery, you get over 300 hours of battery life. This allows you to go weeks at a time without having to recharge. In addition, ANT+ and Bluetooth SMART means you can use the Shimano Ultegra Power Meter with any bike computer, smartphone, or indoor training app.
Key Product Details
Compatibility:
This power meter is compatible with 2×12 road drivetrains and 24 mm Shimano bottom brackets. Most customers that buy it already have a Shimano R8100 crankset on their bike and therefore, it’s an easy swap. However, it can be used on any road bike as long as it is 2×12 with a 24 mm bottom bracket. See Compatibility tab for more information.
Power Measurement:
This Shimano power meter has a power sensor on both crank arms and measures power from both legs. It is also able to measure your left vs. right leg power.
Key Features:
Dual-leg power measurement, can measure left vs. right leg power, accurate to within +/- 2.0%, 300+ hours of battery life, rechargeable battery, Active Temperature Compensation, ANT+ and Bluetooth compatible. See Specs tab for more information.
Advice From Our Staff:
This is a great option for customers with a Shimano R8100 drivetrain that want to keep an OEM R8100 crankset on their bike but add power. We also like that fact that this crankset measures power from both legs, has a long battery life and uses Shimano’s proprietary strain gauge technology.
Options For This Power Meter
The Shimano Ultegra power meter is available in the following options:
- Crank Arm Length: 160 mm | 165 mm | 170 mm | 172.5 mm | 175 mm
- Chainrings: 50/34 | 52/36 | No Chainrings (if you already have them)
Compatibility
Crankset: This power meter is compatible with 2x12 road drivetrains and 24 mm Shimano bottom brackets. Most customers that buy it already have a Shimano R8100 crankset on their bike and therefore, it's an easy swap. However, it can be used on any road bike as long as its 2x12 with a 24 mm bottom bracket.
Check Frame Clearance: Crank-arm based power meters like this one attach a sensor on the inside of the left crank arm. On some bikes, there is not enough room between the left crank arm and the chainstay for the sensor to clear the frame. Therefore, you should make sure you have at least 10 mm of clearance between the left crank arm and the chainstay - and that you don't have a bottom bracket mounted rear brake (used on some aero and TT bikes). The important area to measure is right in the middle of the crank arm. Please refer to the image below.
If you find that you have around 7-9 mm of clearance, what many people will do is simply install a 1 or 2 mm bottom bracket spacer (between the left crank arm and the frame), which will give them the clearance they need.
Shimano Ultegra R8100-P Crankset Specs
| Name | Shimano R8100-P Dual-Sided |
| Bike Type | Road |
| Location of Power Measurement | Crank arm |
| Left or Both Legs Measured | Both |
| Independent Left/Right Measurement | Yes |
| Installation | More involved (60 min. estimated) |
| Crank Arm Material | Aluminum |
| Communication Protocol | ANT+ and Bluetooth SMART |
| Claimed Accuracy | +/- 2.0% |
| Active Temperature Compensation | Yes |
| Weight | 758 grams (50-34T) |
| Battery Type | Rechargeable |
| Battery Life | 300+ hours |
| Method of Cadence Measurement | Magnet |
| BCD | 110 4-bolt asymmetric |
| Spindle Size | 24 mm |
| Q Factor | 148 mm |
| Warranty | 1 year |
In the Box
- Shimano Crankset Power Meter
- EW-EC300 battery-charge cable
- Cadence Magnet
- User Guide
Tools Needed for Installation
You will need the following tools to install this product. You can purchase many of these commonly used tools in our store.
Q&A
Have a question about this? Ask the staff.
OTHER CUSTOMERS ALSO VIEWED
-
power2max NGeco ROTOR ALDHU Road Power Meter CranksetPrice range: $690.00 through $840.00One of our best-selling road power meter cranksets available in a range of sizes -
4iiii dual-sided power on a Shimano Ultegra R8100 crankset -
ROTOR 2INpower SL Road Power MeterPrice range: $900.00 through $1,299.00Lighter and more affordable than ever with dual-leg power +/- 1.5% accuracy FOR CHAINRINGS, PLEASE SEE TEXT SECTION BELOW
-
Shimano DURA-ACE R9200-P Dual-Sided Power Meter CranksetPrice range: $1,580.00 through $1,903.00Dual-sided power on a Shimano DURA-ACE R9200 crankset
THIS PRODUCT IS FREQUENTLY BOUGHT WITH
-
Carbon-Ti X-CarboRing EVO Shimano DA9200 ChainringsPrice range: $200.00 through $590.00The latest evolution of super-light chainrings for Shimano 12-speed cranksets. Only 125 grams -
DURA-ACE-/XTR-level chain. Compatible with 12-speed road and MTB drivetrains and e-Bikes -
For the instillation or removal of Shimano Hollowtech II cranks -
Ultegra-level BSA bottom bracket for Shimano road cranksets
There are no reviews yet.