Rotor 2INPower System Review


Ease of Installation

Value for Money

Battery Life

Ease of Battery Change

Where To Get It

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

  • Who​ are they For?


  • 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 rotor’s 2INPOWER user software which analyses your optimum q-rings orientation, providing 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 it’s 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 use 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 complete with chain ring assembly.

Transfer your existing chain ring assembly to the new 2INPower spider and crank arm. The 2INPower axle is then inserted in to the bottom bracket and the left crank arm 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 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 chain ring
  • 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 are the pedal based power meters like Garmin Vector and Powertap P1. The advantaged 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 righ 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 present 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 pedalling 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 pedalling 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 from Texas has been the best-selling author in 2014. He was the most appreciated writer in 2015. Different organizations have honored him with different awards and memberships as well. He is a tech shop owner and completed graduation in Electrical Engineering.

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