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power2max NGeco ROTOR p2m Edition 24MM Power Meter for GRX Chainrings

Josh Matthew April 12, 2024


Direct power meter replacement for Shimano GRX cranksets with budget friendly p2m Edition crank arms

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power2max NGeco ROTOR p2m Edition 24MM Power Meter for GRX Chainrings

The power2max NGeco ROTOR p2m Edition 24MM Power Meter for GRX Chainrings is a direct replacement for your Shimano GRX crankset. Using the same 24MM spindle as your GRX crankset, this power meter will fit your current bottom bracket without any changes. In addition, it allows you to mount 1x or 2x GRX chainrings and uses an exact GRX Q factor.

Like all power2max power meters, the p2m power meter features dual leg power measurement, ANT+/Bluetooth SMART compatibility and left/right power balance. In addition, the NGeco is accurate to +/- 2.0% in all environmental conditions and is easy to use with features such as auto-zero and accelerometer-based cadence measurement.


Key Product Details


This power meter is a direct replacement for your Shimano GRX crankset. It is compatible with Shimano GRX chainrings and Shimano 24 mm bottom brackets. It uses a GRX chainline and Q factor. See Compatibility tab for more information.

Power Measurement:

The power2max power meter measures power at the spider and is therefore able to measure power from both legs.

ROTOR p2m Edition vs. ROTOR ALDHU

We offer this power meter with both ROTOR power2max Edition (what you are viewing now) and ROTOR ALDHU crank arms. These crank arms work and fit the same, however power2max Edition is a slightly more budget friendly version of the ROTOR ALDHU version. The slightly more expensive ALDHU version has a nicer finish and they are about 40 grams lighter.

Key Features:

Dual-leg power measurement, accurate to +/- 2.0%, 300-400 hours of battery life, CR2450 user-replaceable battery, left/right power balance with system upgrade, ANT+ and Bluetooth compatibility, auto-zero (automatic calibration). See Specs tab for more information.

Advice From Our Staff:

We highly recommend power2max power meters and use them on many of our own bikes. They measure power from both legs, are accurate and very reliable. We believe the price also represents a good value for what you get.


Options For This Power Meter

Crank arms: The ROTOR power2max Edition 24 mm crank arms come in the following crank arm lengths:

  • 165 mm | 170 mm | 172.5 mm | 175 mm

Please note – this power meter ships with a Black decal. Please let us know if you would like us to include a different color instead (Red, Blue, White, Green).


Professional Assembly (Optional) power2max Build Checklist

We are happy to professionally assemble your power meter crankset if you select this option when ordering. This ensures your crankset is correctly built and saves you time. Professional assembly includes:

  • Mount the power meter to the cranks and tighten to factory specifications
  • Apply multi-purpose bicycle grease where necessary
  • Install chainrings on the power meter (if chainrings are ordered)
  • Apply power2max decal

Please note – while we tighten everything to factory specs, it is still your responsibility to routinely check your power meter crankset to make sure all bolts and nuts remain securely fastened.


Other Versions to Consider

Upgraded ROTOR ALDHU Crank Arm Version: We also sell the power2max NGeco ROTOR ALDHU 24MM Power Meter for GRX Chainrings which comes with nicer, but slightly more expensive, ROTOR ALDHU crank arms. The finish on the ALDHU arms is nicer and they are about 40 grams lighter.


This power meter is a Shimano GRX replacement. It fits 24 mm Shimano bottom brackets and Shimano GRX 1x or 2x, 11- and 12-speed chainrings.

power2max NGeco ROTOR p2m Edition for GRX Specs

NameNGeco ROTOR ALDHU Gravel Crankset
Bike TypeGravel
Location of Power MeasurementSpider
Left or Both Legs MeasuredBoth
Independent Left/Right MeasurementYes - Power Balance (available via upgrade)*
InstallationMore involved (60 min. estimated)
Crank Arm MaterialAluminum
Communication ProtocolANT+ and Bluetooth SMART
Claimed Accuracy+/- 2.0%
Active Temperature CompensationNo (however features Auto Zero)
Weight684 grams (power meter and cranks)
Battery TypeCR2450
Battery Life300-400 hours
Method of Cadence MeasurementAccelerometer
BCD110/80 4-bolt
Spindle Size24 mm
Q Factor152 mm
Warranty2 years

*Power Balance Upgrade

The power2max NGeco measures power from both legs right out of the box. However, with power balance, you can see how much power each leg is generating individually. If this information is important to you, you can choose to upgrade the power meter at any time. (Please note, you can also purchase the NG version of the power2max which comes with this feature unlocked, along with a rechargeable battery and a longer 5-year warranty.)

You can upgrade your NGeco using the power2max app once you receive the power meter. The cost to upgrade is 50 euros.

In the Box

  • power2max power meter
  • ROTOR power2max Edition crank arms and spindle
  • CR2450 battery
  • User's manual

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.

  • 10 mm Allen key

Common Questions and Answers

Question: How do I determine what length my current cranks are so I can make sure I get the same size?

  • Your crank arm length should be printed or stamped on the inside of the left crank arm, usually near the pedal end.

End of crank arm showing crank arm length

Question: Do you also stock new chainrings for this power2max GRX crankset?

  • Yes, we have several GRX Chainrings to choose from, including 1x or 2x and round or oval.

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