Rotor 2INPower System Review

At a Glance: Quick Ratings


A Deep Dive Into ​Rotor 2INPower System

​The Rotor 2INPower power meter has been reviewed by Tristan Haskins for A beautiful piece of engineering. The Rotor 2INPower (pronounced “twin power”) dual-sided power metering system has two independent strain gauges. One, in the right crank arm and the other in the bottom bracket axle (left leg power). Through this innovative design, the Rotor 2INPower Dual provides accurate LEFT and RIGHT power balance as well as a true TOTAL power output figure ….

Read Related Article: 4iiii Precision Dual Sided Review

Pros & Cons


The 2INPower power meter is for elite cyclists looking for the highest level of analysis and feedback possible. This high-tech power meter collects an astonishing 500 data points per pedal cycle via a built-in accelerometer. Riders can go even deeper with the rotor’s 2INPOWER user software which analyses your optimum q-rings orientation, providing a visual representation of your pedal stroke’s efficiency.

The 2INPower broadcasts power/cadence data in either ANT+ or Bluetooth smart assuring future-proofing and compatibility with dozens of head units. Another innovative feature of this power meter is its USB rechargeable battery providing 250 hours of riding time per charge. The battery is good for up to 300 full charges before deteriorating (something like 80 years uses riding for 2 hours per day!)


  • Discrete design – no visible components
  • True Left and Right power balance
  • Up to 300 hours ride time from a single USB charge
  • Supports BOTH Bluetooth Smart and ANT+ protocols
  • No tools battery charge system
  • No external sensors – all electronics hidden away
  • Works with BOTH regular round rings and Q-Rings


  • If you want the best then a little hassle fitting shouldn’t put you off …

Method of Installation

How easy is it to install the 2INPower power meter crankset? I give the same answer for all power meters, it depends on who’s installing it. Personally, I’d struggle to fit this system but I know a man who can. The left crank arm needs to be removed first, this is quite easy and can be done with limited tools and no specialist skill. Next, the right side drive-train and axle are removed completely with chain ring assembly.

Transfer your existing chainring assembly to the new 2INPower spider and crank arm. The 2INPower axle is then inserted into the bottom bracket and the left crank arm is fitted. Personally, it’s too much for me. I’d suggest asking your local bike shop what they’d charge to fit it. However, I know a lot of cyclists that could do this in their sleep, ask around and you may find someone who can do it for you / teach you how to do it ….

Watch the Video

Shane Miller (ext. link) has produced a brilliant 11-minute video showing the entire process from removing the existing Shimano Ultegra crankset to installing the 2INPower system. Please SCROLL DOWN for this great video.

Tools Required to fit this Power Meter

  • Crank arm removal tool for your crank e.g. Shimano Hollowtech
  • Allen key set to remove left crank and chainring
  • Soft mallet to tap axle through BB …
  • or consider your LBS ….

Alternative Power Meters

​Customers considering the 2INPower crankset system are looking for the very best in dual-sided power meters. If power balance is something of key importance to you then the obvious alternative is the pedal-based power meters like Garmin Vector and Powertap P1. The advantage these units have over the 2INPower is their ease of installation, so simple I did it!

Technical Specification

  • Spider: 110 BCD
  • Sizes: 165/170/172.5/175mm
  • Battery specifications: Rechargeable Li-ion+USB cable
  • Estimated battery life: 300 hours riding time
  • Strain gauges: 4 gauges in the axle; 4 in the right crank arm
  • Wireless technology: ANT+™, Bluetooth Smart
  • Weight: 645g (172.5mm)
  • Data transmitted: power, balance, cadence, TORQUE 360, OCA, torque effectiveness (L/R) pedal smoothness
  • Head unit: ANT+™, Bluetooth Smart compatible head units
  • Analysis Software:
  • Crank Software: ROTOR 2INpower User Software
  • Q-Factor: 148 mm
  • Chainline: 43.5 mm
  • Material: 100% CNC-machined, 7055 aluminum alloy
  • Compatibility: bottom brackets BSA, ITA, BB86, BB30, BB30A, PF30, BBRight, BB386 Evo, oval and round chainrings, 110 BCD, 9,10 and 11-speed

Photo Gallery


External Videos

1) Rotor presents 2INPOWER (marketing video)

Knowing your strengths is helpful, but knowing your weaknesses is like mining for gold, which is why ROTOR Bike Components has introduced its new 2INpower (“twin” power) dual-sided power meter. 2INpower measures power individually in each leg to provide precise data about balance and power output in order to demonstrate where improvements can be made to pedaling performance …

2) Installing the 2INPower crankset

Watch Shane Miller swap out his Shimano Ultegra chainset (with Stages power meter) with the ROTOR 2INpower power meter (172.5mm, 110BCD). Shane has all the right tools and makes it look quite easy ….

3) Unboxing The Rotor 2INPower Powermeter – GCN

This video is a must-watch for anyone considering the Rotor 2INPower crankset. GCN presents the product as it arrives from BOX to BIKE.

External Resources

The purpose of product presentations is to give the visitor a summary overview of each power meter. They are NOT intended as an in-depth technical review, more a summary providing essential top-level features, functions,
pros, and cons. Further information can be found at these links to other external reference sites.

Product Summary

​One of the most comprehensive power metering solutions currently on the market. The 2INPower system offers genuine left-right power analysis in a performance crankset that’s compatible with both round rings and Rotor’s Q-rings. To obtain a true power balance pedaling data is collected independently from both left and right legs. The result is the most advanced power metric system on the market.

Power from the left leg is measured through INPower’s trusted axle-based strain gauges. Power from the right leg is measured from strain gauges placed in the crank arm on the drive-side. All this sophistication means riders get the most detailed pedaling analysis possible, including balance, pedal smoothness, and torque effectiveness.

The 2INPower system provides true bi-lateral power assessment with both legs being measured 100% independently. It’s not the cheapest power metering solution, neither is it the easiest to install, but it’s highly recommended for technical riders wanting every possible power metering metric.

Read Other Review: Powertap P1 Pedals Review

Andrew Wyatt

Andrew Wyatt

Andrew Wyatt has been a tech geek for as long as he can remember. Whether it's laptops, cameras, or projects, he's obsessed with it all. When he's not researching the latest tech products, he likes to go on long hikes with his dogs.

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