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Magene ROTOR ALDHU Road Power Meter Crankset

Power Meter City April 15, 2024


Magene power meter + ROTOR ALDHU crank arms!

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Magene ROTOR ALDHU Road Power Meter Crankset

The Magene ROTOR ALDHU Road Power Meter Crankset combines the Magene P505 spider-based power meter with ROTOR ALDHU crank arms. This is an affordable, high-quality power meter crankset that features dual leg power measurement, +/- 1.0% accuracy and a rechargeable battery with 200 hours of ride time.

ROTOR ALDHU Road crank arms are CNC machined from 7075-aeronautic grade aluminum to offer unmatched rigidity while keeping weight low. These are available in a variety of crank lengths in addition to both 24 mm and 30 mm spindles. This allows riders to customize their crankset and often times, match the bottom bracket already being used in the frame.


Key Product Details


This power meter crankset is compatible with 24 mm or 30 mm bottom brackets, depending on the version ordered. It is also compatible with both 110×4 BCD and 110×5 BCD chainrings. See Compatibility tab for more information.

For Shimano Users:

If you currently have a Shimano road crankset on your bike, this power meter can be a direct replacement. If you select one of the 24MM ALDHU crank sizes, it will come with the same spindle size as your current Shimano crankset and will fit your bottom bracket without any changes. In addition, you can also use your current Shimano chainrings on it. This makes replacing your Shimano crankset very simple and easy.

Power Measurement:

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

Key Features:

Dual-leg power measurement power measurement, aluminum crank arms, 24 mm and 30 mm bottom bracket compatibility, accurate to +/- 1.0%, 200 hours of battery life, rechargeable battery, left/right power balance, ANT+ and Bluetooth compatibility, automatic calibration. See Specs tab for more information.

Advice From Our Staff:

This power meter crankset is an extremely versatile crankset that gives riders the option to upgrade their crankset in addition to choosing from a variety of crank lengths and spindle diameters. We recommend this power meter crankset to riders looking for an affordable and high-quality aluminum power meter crankset.


Options For This Power Meter

Crank arms: You have the option of either ROTOR ALDHU 24 mm crank arms (uses a 24 mm spindle) or ALHDU 30 mm crank arms (uses a 30 mm spindle). Each of these cranks comes in a wide range of crank arm lengths.


Professional Assembly (Optional)Magene 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)

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

Magene ROTOR ALDHU Carbon Crankset: If you are looking for power meter that uses carbon crank arms, consider the Magene ROTOR ALDHU Carbon Road Power Meter Crankset. This uses the same Magene P505 power meter, but features ROTOR’s ALDHU carbon arms which provide significant weight savings when compared to the aluminum version. Please note however, the carbon version is only available in a 30 mm spindle.


Chainrings: This power meter fits both 110x4 BCD and 110x5 BCD chainrings. In many cases, you can use your existing chainrings assuming they use the same configuration as the power meter you order.

The 110 BCD 4-Bolt version is compatible with all Shimano 4-bolt chainrings, including Shimano 12-speed chainrings.

What is BCD?: BCD (bolt circle diameter) is simply the diameter of a circle that passes through the centers of the bolt holes in your chainring. The BCD is usually stamped right on the chainring as either 110 or 130. It is important to know what BCD your crankset is because assuming you want to use your existing chainrings on your new power meter, you need to order the correct BCD.

Image of a chainring explaining the concept of BCD

Bottom Bracket: This power meter fits 24 mm or 30 mm bottom brackets, depending on the version ordered. If you are ordering the same size as you currently have on your bike, you should be able to re-use your existing bottom bracket. However, if you are changing spindle sizes, you will need to replace your bottom bracket. Please contact us with questions, we are happy to help.

Magene ALDHU Crankset Specs

NameMagene ROTOR ALDHU Crankset
Bike TypeRoad
Location of Power MeasurementSpider
Left or Both Legs MeasuredBoth
Independent Left/Right MeasurementYes - Power Balance
InstallationMore involved (60 min. estimated)
Crank Arm MaterialAluminum
Communication ProtocolANT+ and Bluetooth SMART
Claimed Accuracy+/- 1.0%
Active Temperature CompensationNo (however features Auto Zero)
Weight with 24 MM Cranks614 grams
Weight with 30 MM Cranks575 grams
Battery TypeRechargeable
Battery Life200 hours
Method of Cadence MeasurementAccelerometer
BCD110 5-bolt or 110 4-bolt
Spindle Size24 mm or 30 mm
Q Factor147.5 mm
ROTOR Warranty5 years
Magene Warranty2 years

In the Box

  • Magene power meter
  • ROTOR ALDHU crank arms and spindle
  • Charging cable
  • 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: What is the difference between Magene and other spider-spider based power meters that are compatible with ROTOR ALDHU crank arms?

Question:Magene offers a few different power meter cranksets, what are the differences?

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


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