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ROTOR INpower DM MTB Power Meter

Josh Matthew June 27, 2024


ROTOR’s INpower MTB now with DM rings and Bluetooth SMART

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ROTOR INpower DM MTB Power Meter

The ROTOR INpower DM MTB Power Meter measures left leg power using two sets of opposing strain gauges in the axle. The strain gauges are able to measure power, cadence, torque effectiveness and pedal smoothness. Specifically designed for off road use, all of the electronics are located inside the water-proof, sealed axle. This makes the INpower DM MTB super durable and able to withstand the muddiest, harshest conditions.

However unlike the previous generation power meter, the new INpower DM MTB uses ROTOR’s Direct Mount Chainrings. The Direct Mount rings are machined from a solid block of 7075 aluminum which makes them lighter and stronger than the standard 2x chainring configuration. The ROTOR INpower DM MTB has ANT+ and Bluetooth SMART functionality, is powered by a AA battery with 300-hour battery life and features +/- 1.5% accuracy.

The ROTOR INpower DM MTB features ROTOR’s 30 mm UBB (Universal Bottom Bracket) design. This makes the power meter compatible with almost all standard frames when used with the correct spacers. In addition, when used with a Q-Ring, ROTOR’s OCP (Optimum Chainring Position) technology allows you to identify your OCP in order to fine-tune your Q-Rings for optimized pedaling performance and efficiency.


Key Product Details


This power meter fits 30 MM MTB bottom brackets and is compatible with ROTOR Direct Mount Chainrings. See Compatibility tab for more information.

Power Measurement:

This ROTOR power meter measures left leg power and doubles the value to account for both legs (assumes both legs are generating the same force).

Key Features:

Accurate to within +/- 1.5%, 300 hours of battery life, uses AA batteries, ANT+ and Bluetooth compatible, 2-year warranty. See Specs tab for more information.

Advice From Our Staff:

The advantages to this power meter are it’s relatively affordable (as far as ROTOR power meters go), the aluminum crank arms are light and stiff and it’s easy to run oval rings. The drawback is that it only measures left leg power, whereas most power meter cranksets measure power from both legs.


Options For This Power Meter

The ROTOR INpower MTB Power Meter is available in the following configurations:

  • Crank Length: 165 mm | 170 mm | 175 mm
  • Chainring Size: 30 | 32 | 34 | 36 | No chainrings (if you already own them)
  • Chainring Shape: Round | Q-Ring (Oval) | No chainrings (if you already own them)

Please note – the ROTOR INpower MTB is only compatible with ROTOR Direct Mount MTB Chainrings.


Other Versions to Consider

2INpower Version: While the INpower you are viewing on this page measures power from just the left leg, we also have the ROTOR 2INpower MTB Crankset Power Meter. This is a more expensive version however it measures power from both legs.


Chainrings: The ROTOR INpower MTB is compatible with ROTOR Direct Mount MTB chainrings, which can be purchased on this page along with the power meter.

Bottom Bracket: This power meter fits 30 MM bottom brackets. If you currently have a 30 MM crankset 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.

ROTOR INpower DM MTB Specs

NameINpower DM MTB Power Meter
Bike TypeMTB
Location of Power MeasurementAxle
Left or Both Legs MeasuredLeft
Independent Left/Right MeasurementNA
InstallationMore involved (60 min. estimated)
Chainring Configuration1X
Speeds9-, 10-, 11- and 12-speed
Chainline SpacingBoost
Crank Arm MaterialAluminum
Communication ProtocolANT+ and Bluetooth SMART
Claimed Accuracy+/- 1.5%
Active Temperature CompensationNo
Weight635 grams (170 mm, 34T)
Battery TypeAA
Battery Life300 hours
Method of Cadence MeasurementAccelerometer
Spindle Size30 mm
Q Factor169 mm boost
Warranty2 years

In the Box

  • ROTOR INpower DM MTB
  • DM Chainrings (if purchased)
  • USB cable for charging
  • Users 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
  • 8 mm Allen key
  • ROTOR DM lockring tool (supplied)

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


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