Stages Shimano XT M8120 Dual-Sided CranksetJosh Matthew May 20, 2022
Stages dual-sided power on a Shimano XT M8120 crankset
Stages Shimano XT M8120 Dual-Sided Crankset
The Stages Shimano XT M8120 Dual-Sided Crankset features Stages proven performance and reliability on a Shimano XT M8120 crankset. This Stages power meter is accurate to within 1.0%, durable and ready to handle the toughest terrain. In addition, with a power sensor on both crank arms, it can measure total as well as independent left and right leg power.
The power meter is also extremely lightweight – adding only 35 grams to the weight of the crank. All Stages power meters are compatible with both ANT+ and Bluetooth SMART devices, which means you can use your favorite bicycle computer as well as a smartphone or tablet.
The Stages Generation 3 power meter features radio antennas that are 6x more powerful than the previous version. This means better compatibility with both bike computers and watches. The new versions also feature improved accuracy (+/- 1.5%) and have an LED indicator light on the housing for improved ease of use.
Crank arm lengths: 170 mm | 175 mm
Chainring size: 32T
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
- Shimano Direct Mount Lock Ring Tool (if changing chainrings)
Crankset: This power meter uses a 24 mm Shimano MTB spindle and must be used with a 24 mm Shimano bottom bracket.
Tip - If you already have a Shimano MTB 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.
Stages Shimano XT M8120 Crankset Specs
|Name||Stages XT M8120 Crankset|
|Location of Power Measurement||Crank Arm|
|Left or Both Legs Measured||Both|
|Independent Left/Right Measurement||Yes|
|Installation||More involved (60 min. estimated)|
|Chainline Spacing||55 mm|
|Crank Arm Material||Aluminum|
|Communication Protocol||ANT+ and Bluetooth SMART|
|Claimed Accuracy||+/- 1.5%|
|Active Temperature Compensation||Yes|
|Weight||35 grams (added weight)|
|Battery Type||CR2032 coin cell|
|Battery Life||200+ hours|
|Method of Cadence Measurement||Accelerometer|
|Spindle Size||24 mm|
In the Box
- Stages Power Meter
- Shimano 32T chainring
- 2 2032 coin cell batteries
- Lifetime access to Stages Link for power meter management and firmware upgrade
- 2 months free access to Stages Link premium training and coaching features
- Quick Start guide