INPower DM Road Power Meter Crankset w/ Spidering, Q-Rings - black/175.0 mm 36-52
Item number: 70839

Achieve your training goals: the INPower DM Road Crank with Rotor Spidering

Integrated power measurement technology lies at the heart of the Rotor INPower direct mount road crank. Power measurement data is taken from the left leg using strain gauges in the axle, which provide precise values for power, cadence, torque efficiency and concentricity. All internal electronics are waterproof, which centres the rotating mass and provides maximum protection.

The Rotor InPower DM road crank is a powerful tool that allows you to measure individual pedalling biomechanics using the Rotor Power App. Get real-time access to specific information such as Torque 360, Optimum Chainring Angle (OCA) or a recommendation for the optimal chainring position (OCP).

Connect your Rotor INPower DM crank to a bike computer or smartphone via Bluetooth Smart or ANT+ to easily export your data and dive deeper into training analysis with platforms such as
Setup and calibration are user-friendly, and everything is powered by a standard AA battery in watertight casing, which provides up to 300 hours of operation.

This bundle is supplied with an oval Rotor Spidering double chainring (Q-ring), and it is manufactured in one piece and can be directly mounted on the axle without tools. Only a 10 mm hex tool is required to mount or dismount the crank arm on the drivetrain side. Crackling from the screw connections between spider and chainring is now a thing of the past. For the first time, the direct mount system facilitates the fine adjustment of oval chainrings in 1-degree increments, which helps to create unique customisation options tailored to individual requirements.

Information regarding the return of batteries and electrical equipment:

Information on the return and disposal of batteries and electrical equipment can be found here.


Road, Triathlon
crankset with power meter (left)
2x10-speed, 2x11-speed
Chainring Mount:
Rotor Direct Mount

Technical Information:

Crank Arm Material:
aluminium (6082, 7075)
Chainring Material:
aluminium (7075)
34-50, 36-52
Crank Arm Length:
170.0 mm, 172.5 mm, 175.0 mm
43.5 mm
147.5 mm
Axle Diameter:
30 mm
Recommended Bottom Bracket:
BSA, BB386EVO, BB86, PF30*
+/- 0.5%
Point of Measurement:
crank axle
Power Source:
1 x AA mignon battery (1.5 V)
Battery Life:
up to 300 h
Data Collected:
power, cadence, torque (left), pedal stroke uniformity (left)
Data Transfer:
ANT+, Bluetooth Smart (4.0/LE)

* A complete overview of compatible bottom brackets and any necessary spacers can be found in the spacer chart by Rotor.


  • CNC-machined, anodised crank arms
  • power measurement electronics and battery integrated in the axle
  • 4 strain gauges
  • data transmission protected from dirt and shocks
  • tool-free battery replacement
  • low battery alert
  • software download/updates on the Rotor homepage
  • additional values via software: Torque 360, OCA (Optimum Chainring Angle)
  • assembly requires 10 mm, 8 mm and 2 mm hex tool
  • crank connects to PC via USB ANT+ stick (e.g. Rotor USB ANT+ dongle)
  • combination chainring in one-piece design
  • OCP (Optimum Chainring Position) Mount Technology: The orientation of the oval chainrings can be finely adjusted through five mounting positions of the crank on the axle; numerous mounting options for spidering or chainrings
  • easy chainring exchange with allen wrench


Aluminium CNC
Computer Numerical Control (CNC) milling ensures a precise and uniform production process. This is particularly important when manufacturing components that must function properly and work in congruity with other parts. Thanks to state-of-the-art CNC equipment, Rotor parts are manufactured with extreme precision, down to a hundredth of a millimetre.

Rotor CNC cranks are stiffer than competitive cranksets thanks to Trinity Drilling System (TDS). In this procedure, three full holes are drilled from the bottom bracket to the pedal. This creates a box-like grid, similar to a box girder bridge. This makes the cranks extremely stiff while at the same time reducing weight, resulting in an excellent stiffness-to-weight ratio.

Inner values count! The technology of the Rotor INPower is completely and securely positioned inside of the axle. The patented ROTOR INPower with integrated power measurement will improve your training in both quality and experience aspects. It is one of the lightest integrated power measuring cranks and is an ideal introduction to power-controlled training. Safe from shocks and debris, the placement of the strain gauges in the centre of the axle provides accurate and reliable data transmission. The measured data are recorded in the left crank arm. The Optimal Chainring Angle (OCA) system allows you to find the ideal Optimal Chainring Position (OCP) setting for your Q-Ring by analysing the force within one pedal rotation. Replacing the standard AA battery can be carried out without tools.

Optimum Chainring Position (OCP) indicates the various adjustments that Rotor Q-Rings offer to adapt to the rider's specific pedalling characteristics. Q-Rings have up to 5 OCPs. These positions help to optimise your pedalling behaviour.
You can determine your OCP if you know your optimal chainring angle (OCA), which you can determine by a Torque 360 step analysis with the user software of Rotor 2INPower and INPower.

Manufacturer Numbers:

170.0 mm 34-50:
C13-032-19010-000 + C01-039-11010-0
172.5 mm 34-50:
C13-032-20010-000 + C01-039-11010-0
175.0 mm 34-50:
C13-032-21010-000 + C01-039-11010-0
170.0 mm 36-52:
C13-032-19010-000 + C01-039-09010-0
172.5 mm 36-52:
C13-032-20010-000 + C01-039-09010-0
175.0 mm 36-52:
C13-032-21010-000 + C01-039-09010-0


  • 1 x Rotor DM Road left crank arm
  • 1 x Rotor DM Road right crank arm, incl. Rotor INPower axle
  • 1 x Rotor INPower crank bolt w/ washer and puller, pre-installed
  • 1 x Rotor Spidering Q-ring double chainring
  • incl. spacers
  • bottom bracket not incl.
  • not incl. batteries


  • black/172.5 mm 36-52: 688 g
Tested by Stephan
  • 100 day return period
  • Online since 1998
  • Trusted Shop 4.89 / 5.00


  • black/170.0 mm 34-50, out of stock
  • black/170.0 mm 36-52, in stock
  • black/172.5 mm 34-50, out of stock
  • black/172.5 mm 36-52, in stock
  • black/175.0 mm 34-50, out of stock
  • black/175.0 mm 36-52, in stock

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