What power meter will fit my Shimano XT MTB crankset?

There are several power meters that will work a Shimano XT MTB crankset. Please note that some of these power meters fit XT M8000 only, while others fit XT M8100 only. XT M8000 and M8100 use different spline depths, so it’s important you select a power meter that is compatible with your crankset.

Left Crank Arm Power Meter

For Shimano XT M8100 cranks:

These power meters are left side crank arms. They measure the power that is produced by your left leg, and double the value to approximate your total power. You simply use them in replace of your existing crank arm. Installation is quick and easy.

4iiii PRECISION Power Meter For Shimano XT M8100/8120

4iiii PRECISION Power Meter For Shimano XT M8100/8120

Stages Shimano XT M8100/8120 Power Meter

Stages Shimano XT M8100/8120 Power Meter

Please note, these power meters attach a sensor to 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 for Stages and 4iiii PRECISION 2 power meters and 8 mm of clearance for 4iiii PRECISION 3 power meters. Also, please make sure that you don’t have a bottom bracket mounted rear brake (used on some aero and TT bikes). Please refer to the image below.

Pros: Affordable, easy to install, don’t have to change crankset
Cons: Measures left leg power only

Right Crank Arm Power Meter

For Shimano XT M8100 cranks:

Stages Shimano XT M8120 Driveside Power Meter

Some bike frames are not able to fit a left side crank arm power meter like the ones above as there is not sufficient frame clearance for the power sensor. However, Stages Cycling makes a right side version that will fit all frames. The right side versions cost a bit more, as they also come with new chainrings.

Stages Shimano XT M8120 Driveside Power Meter

Pros: Affordable, easy to install, don’t have to change crankset
Cons: Measures right leg power only

Spider Power Meter

For Shimano XT M8100 cranks:

power2max NGeco Shimano MTB Power Meter

These power meters are compatible with Shimano MTB direct mount cranksets using a 1x chainring such as the M8100. In addition, because they are spider-based power meters, they measure power from both legs.

power2max NGeco Shimano MTB Power Meter

Sigeyi AXO Shimano MTB Power Meter

The Sigeyi AXO Shimano MTB power meter is also compatible with Shimano MTB direct mount cranksets such as the M8100. They are spider-based power meters, affordably priced and measure power from your left and right legs.

Sigeyi AXO Shimano MTB Power Meter

Please note, the power2max and Sigeyi use a 104 BCD chainring configuration. So you will need a 104 BCD MTB chainring as well.

Pros: Moderately priced, VERY reliable, don’t have to change crankset, measures both legs
Cons: None

Power Meter Pedals

For ALL Shimano XT cranks:

MTB power meter pedals are also an option as they can easily be installed on any MTB crankset. We have the Garmin Rally XC, SRM X-Power and SRM X-Power Flat Pedals.

Pros: Easy to install, works on any bike, can move from bike to bike, don’t have to change crankset
Cons: Some versions are pricey

Crankset Power Meter

Stages Shimano XT M8120 Dual-Sided Crankset

Of course, you can also choose to replace your crankset entirely for a new one. These cranksets are move expensive then a left or right side crank arm, but they measure power from both the left and right leg. They also come with a new set of chainrings.

Stages Shimano XT M8120 Dual-Sided Crankset

Pros: Accurate, reliable, measures both legs
Cons: More expensive, more work to install