4iiii PRECISION Shimano Ultegra R8100 Single-Sided CranksetAugust 4, 2022
4iiii left side power on a Shimano Ultegra 12-speed groupset!
4iiii PRECISION Shimano Ultegra R8100 Single-Sided Crankset
The 4iiii PRECISION Shimano Ultegra R8100 Single-Sided Crankset brings 4iiii left side power to Shimano’s new Ultegra 12-speed groupset! The 4iiii PRECISION 3 power sensor is accurate to +/- 1.0%, is lightweight and features an 800-hour battery life. The power meter is compatible with both ANT+ and Bluetooth SMART devices. This means you can use it with your favorite bike computer, smart phone or indoor training app.
Please note – this crankset measures left leg power only.
- Chainrings: 50/34 | 52/36 | 53/39
- Crank arm lengths: 165 mm | 170 mm | 172.5 mm | 175 mm
Tools Needed for Installation
You will need the following tools for installation of this product. You can purchase many of these commonly used tools in our store.
- Shimano Crank Arm Cap Tool
- 5 mm Allen key
Bottom Bracket: This power meter uses a 24 mm Shimano road spindle and must be used with a 24 mm Shimano bottom bracket.
Tip - If you already have a Shimano crankset on your bike, then this power meter will fit your bottom bracket perfectly as all Shimano cranksets use a 24 mm spindle.
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.
4iiii Shimano Ultegra R8100 Power Meter Specs
|Name||4iiii PRECISION 3 R8000 Crankset|
|Location of Power Measurement||Crank arm|
|Left or Both Legs Measured||Left|
|Independent Left/Right Measurement||No|
|Installation||More involved (60 min. estimated)|
|Crank Arm Material||Aluminum|
|Communication Protocol||ANT+ and Bluetooth SMART|
|Claimed Accuracy||+/- 1.0%|
|Active Temperature Compensation||Yes|
|Battery Life||800 hours|
|Method of Cadence Measurement||Accelerometer|
|BCD||110 4-bolt asymmetric|
|Spindle Size||24 mm|
In the Box
- 4iiii PRECISION Shimano Ultegra R8100 Single-Sided Crankset
- CR2032 coin cell battery