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RotorINPower Direct Mount Crank Arms


Item # RTR003M

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  • Black, 175mm ($699.00)
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Item # RTR003M

INPower Direct Mount Crank Arms

Equipping your bike with a power meter opens up a whole new world of training options. For one, it allows you to train with better specificity. Tracking and analyzing power data and using it to tailor your workouts is a great way to become a faster rider if you stick with it. It also gives you the ability to use smart trainers for indoor workouts, as well as training apps and programs that collect data in real time and make the whole process easier. If you're ready to ride with power, take a serious look at the Rotor INPower Direct Mount Crank Arms. Because not only do these crank arms give you the benefit of power readings, but they are impressively stiff and lightweight, ensuring your gains are efficiently translated into forward momentum.

Instead of the dual-leg, eight-gauge approach of the 2INPower model, the INPower meter uses four gauges to measure power and pedal stroke data coming through the left crank arm only. Like other power meters, the INpower's four strain gauges are all spindle-bound and it's equipped with an accelerometer to read cadence. But unlike other meters, Rotor's design measures cadence over 500 times per pedal stroke. While the benefits of mapping minute changes in cadence over each leg's power production are immediately obvious to any data obsessive, the potential is magnified exponentially when paired with Rotor's direct mount Q-Ring system. It helps you chart the most efficient direct mount Q-Ring orientation possible to capitalize on the strengths of your pedal stroke while mitigating the weaknesses. The crank arms work just fine with Rotor's direct mount round chainrings, but adding their direct mount Q-Rings takes full advantage of the system's potential.

The INpower transmits data via both Bluetooth and ANT+, so chances are good that it's already compatible with whatever head unit you're running, as well as your smartphone. As far as frame compatibility goes, the INPower Direct Mount Crank Arms have a 30mm spindle, so it may take some adapting to adapt it to your shell, but it's compatible with English and Italian threaded, BB86, BBRight, BB386EVO, and—of course—BB30 and PF30 bottom bracket shells. The unit's 300-hour ride time relies on one AA battery, so re-upping is never an issue. Rotor also provides a seamless data upload and management interface by partnering with TrainingPeaks.

The crank arms themselves are the product of Rotor's Trinity Drilling System (TDS), a method of hollowing out the cranks, which reduces weight and maximizes stiffness. Unlike traditional hollow crankset designs, TDS involves drilling three channels from the pedal to the spindle. While these holes remove excess material, they also leave behind two thin walls, making them stiffer than the design of a single hollow chamber. The TDS creates a maximum strength-to-weight ratio, and the arms are constructed using tought but lightweight 6082 and 7075 aluminum alloy. Please note that Rotor's direct mount chainrings and a bottom bracket are both sold separately.

  • Start training with power using Rotor's proven road cranks
  • Four strain gauges measure output from left crank arm
  • Electronics housed in the spindle to protect from elements
  • Measures cadence over 500 times per pedal stroke
  • Lightweight, stiff alloy construction proven on the biggest stage
  • Pair with direct mount Q-rings for maximum training metrics
  • Partnership with TrainingPeaks makes for seamless data management
  • Replaceable AA battery ensures a re-upping isn't a chore

Tech Specs
Arm Material6082, 7075 aluminum alloy
Arm Length170mm, 172.5mm, 175mm
Bolt Circle DiameterRotor Direct Mount
Rings1, 2
BB TypeBB30, PF30, BBright, BB386, BSA threaded, ITA threaded, BB86
Q Factor147.5mm
Compatible ComponentsRotor Direct Mount Chainrings (Round and Q-rings)
Recommended Usecycling
Manufacturer Warranty1 year

Actual Weight

Black, 175mm

Claimed Weight

Claimed weights are provided by the vendor.

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[172.5mm] 510g

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

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