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Rotor2INPower Powermeter Direct Mount Crankset


Item # RTR003B

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  • Black, 170mm ($1,315.00)
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Item # RTR003B

2INPower Powermeter Direct Mount Crankset

Putting a power meter on your bike is the absolute best way to track data on rides and train with better specificity as well as allowing you to take advantage of smart trainers and utilizing apps and programs. Of course, there's also the metrics available on race day so you don't let the adrenaline or competition take you out of the zones you know you're capable of maintaining. If you're ready to bite the bullet and get a powermeter, we suggest you have a look at the 2INPower Powermeter Direct Mount Crank Arms from Rotor to take care of your needs and open up a whole new world of bike riding with power numbers at your disposal.

Rotor's 2INpower calculates power by getting readings from both legs, four gauges in the spindle and four in the right arm, versus the approach of the INpower model, only using four gauges in the spindle and doubling the effort. The two legged approach is more accurate and provides even more detail such as leg efficiency and pedal stroke balance. The direct-mount technology provides a spline interface for mounting the firm's round or oval chainrings which provides excellent stiffness and easy clocking of the oval rings to suit your pedaling needs.

The 2INpower's eight strain gauges pair with an accelerometer to read cadence and calculate power by sampling these numbers at over 500 times per pedal stroke and it provides valuable data especially when setting up the Q Rings. Applications such as Torque 360 and Optimum Chainring Angle (OCA) help to provide a recommendation of your Optimal Chainring Position (OCP) for the most efficient Q-Ring orientation.

The 2INpower transmits data via Bluetooth Smart and ANT+ protocols, so most likely your head unit you're currently running is good to go. The 2INpower has a 30mm spindle and Rotor provides bottom brackets that are compatible with English and Italian threaded, BB86, BBRight, BB386EVO, BB30 and PF30 bottom bracket shells. The unit's 250-hour ride time relies on a rechargeable Li-ion battery with a USB cable so re-upping is never an issue. Rotor also provides a seamless data upload and management interface by partnering with TrainingPeaks.

  • Read your pedaling power with Rotor's 2INpower
  • Eight strain gauges extrapolate total output from both legs
  • Charts cadence with an internal accelerometer
  • Rechargeable batteries ensure a re-upping isn't a chore
  • Lightweight, stiff 30mm alloy construction is pro-proven
  • Pair with direct-mount Q-rings for maximum training metrics
  • Partnership with TrainingPeaks makes for seamless data management
  • Electronics housed in the spindle and right arm and protected from the elements

Tech Specs
Arm Materialaluminum
Arm Length160, 170, 172.5, 175mm
BB TypeEnglish and Italian threaded, BB86, BBRight, BB386EVO, BB30, and PF30
Q Factor147.5mm
Recommended Usecycling
Manufacturer Warranty2 years

Actual Weight

Black, 170mm

Claimed Weight

Claimed weights are provided by the vendor.

Have questions? Chat with a Gearhead

[without rings] 1lb 5oz

Actual weights are measured in-house by the Competitive Cyclist team.

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What do you think about this product?



I don't get it. Where is the spider? How do I mount chain rings? What drive train does this work with?

Hi Alan, These are designed to be used with Rotor's direct mount chainrings, or Rotor direct mount spiders. Here is our item number for some compatible Rotor chainrings; RTR003E.


Will this work with my current Rotor 3D30 UBB5, 52/36T? Do you his swap out the crank arms?

>Rating: 5

Consistent and Reliable

I've put it through the wringer

Power meters do not get any better than this. This power meter is awesome. It is easy to use, consistent, reliable, and durable. It even comes with a charger! No changing batteries here. It is easy to pair with any computer and calibrate. Then you're off riding. You don't even have to calibrate every time. This thing picks up more data points in your pedal stroke than any other option. It is dual sided and picks up your left/right balance. There is no question in your data feedback with this option. It will get it right every time and provide the data you need.