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Favero Assioma DUO-Shi Power Meter Spindles

Josh Matthew September 25, 2022
5.00 out of 5 based on 7 customer ratings
(7 customer reviews)


The Favero Assioma Power Meter now for Shimano SPD-SL riders!

In stock

Favero Assioma DUO-Shi Power Meter Spindles

The all new Favero Assioma DUO-Shi Power Meter Spindles allow Shimano users to enjoy one of the best-selling power meters on the market! The DUO-Shi Power Meter Spindles consist of two special pedal spindles that can be quickly and easily installed into your current Shimano SPD-SL pedal bodies. Therefore, you can experience everything the Assioma DUO has to offer while keeping the Shimano pedals you have grown to love. In addition, the DUO-Shi is compatible with Shimano PD-R8000, PD-R7000, PD-6800, PD-R550 and PD-R540 pedal bodies.

The Favero Assioma DUO-Shi’s feature all of the power meter technology found in the original DUO. This includes IAV power with +/- 1.0% accuracy, IAV cycling dynamics, Favero’s user friendly app and more. In addition, these DUO-Shi spindles are a dual-sided power meter with a power sensor located in each spindle. This means the power meter can show both left and right leg power, in addition to total power and cadence.


Important Note on Q Factor

The Favero Assioma DUO-Shi Power Meter have a Q Factor of 64-65 mm. This compares to 53-54 mm for most other pedals. This means each pedal will be approximately 10-12 mm further away from the bike than normal. Since Q Factor and bike set-up is subjective, each rider needs to determine if this is an ideal set-up for them.


Favero Assioma DUO-Shi Spindle Highlights

Dual-Sided Power

With a power sensor in each spindle, the Assioma DUO-Shi can measure true left and right power. While some power meters provide an estimated left/right power figure, only a few can provide true left/right data.

Easy to Install & Transfer

Once you have installed the spindles into your Shimano pedal bodies, the DUO-Shi installs on your bike just like a normal pedal. You can also move them from bike to bike in seconds!

ANT+ & Bluetooth SMART

With both ANT+ and Bluetooth SMART, the pedals will work with your favorite cycling computer, GPS watch, smart phone or tablet. The choice is yours!

Accurate with IAV Power

The DUO-Shi uses Favero’s IAV Power Technology. IAV results in accuracy of +/- 1.0%. It also allows the Assioma pedals to be used with oval chainrings without any impact to the accuracy of your data!

IAV Cycling Dynamics

Favero’s built-in gyroscope also allows you to measure cycling dynamics data such as IAV Power Phase and IAV Rider Position. With these advanced metrics, you can become a faster, stronger rider!


Using cutting-edge materials, the weight of each pedal is only 157 grams (PD-R8000). Therefore, this makes it one of the lightest power meter pedals available.


The Favero Assioma DUO-Shi uses a rechargeable lithium-ion battery which offers a 50-hour life. When the battery gets low, simply plug them in using the included charger, and you’re good to go again.

User Friendly App

The Assioma app allows you to update firmware, perform zero-offsets, check battery levels and more. Also, the “Compatibility with other apps” function ensures it works with other apps and training software.

Proved and Guaranteed

Each Assioma undergoes strict control tests (load, shock, fatigue, wear, water resistance, etc.) in order to ensure performance. It also comes with a full two-year warranty.

Favero IAV Power Technology

The Assioma uses Favero’s IAV (Instantaneous Angular Velocity) Power. Using special software and a built-in three-axis gyroscope, IAV takes into account the precise pedaling speed within each pedal stroke. This results in the Favero Assioma DUO-Shi having accuracy of +/- 1.0%. In addition, IAV allows you to use the Assioma pedals with oval chainrings without any impact to the accuracy of your data!

Favero IAV Cycling DynamicsFavero Assioma IAV Cycling Dynamics

Favero’s gyroscope also allows you to measure cycling dynamics data. IAV Power Phase displays the portion of your pedaling stroke in which torque is produced. In addition, your Power Phase Peak, in which maximum torque is produced, is also indicated. IAV Rider Position displays the portion of time you are in a seated vs. standing position. This allows you to analyze how a specific position can influence your performance. This data works with most Garmin bike computers including the Edge 1030, 830, 820, 530 and 520 Plus.




The installation of the DUO-Shi spindles into your Shimano pedal bodies is quick and easy. Please view the video on the Videos tab.

DUO-Shi Spindles Compatibility

The Favero Assioma DUO-Shi Power Meter Spindles are compatible with the Shimano PD-R8000, PD-R7000, PD-6800, PD-R550 and PD-R540 pedal bodies.

Please note, these spindles do not work with DURA-ACE pedals as they use a different axle design and are therefore not compatible.

Favero Assioma DUO-Shi Spindles Specs

NameFavero Assioma DUO-Shi
Bike TypeRoad
Location of Power MeasurementPedal
Left or Both Legs MeasuredBoth
Independent Left/Right MeasurementYes
Communication ProtocolANT+ and Bluetooth SMART
Claimed Accuracy+/- 1.0%
Active Temp. CompensationYes
Cleat TypeShimano SPD-SL
Weight99 grams (each spindle). 157 grams (with R8000 pedals)
Battery TypeRechargeable lithium ion
Battery Life50 hours
Method of Cadence MeasurementAccelerometer
Rider Weight Limit265 lbs.
Warranty2 years
Spindle Length64-65 mm

In the Box

  • Left power spindle with adapter for Shimano pedal bodies
  • Right power spindle with adapter for Shimano pedal bodies
  • Battery charger including plugs (EU, US, UK, AU)
  • 2 two-meter micro-USB cables with magnetic connectors
  • 1 hex key and 4 washers
  • User's manual

Shimano pedal bodies supplied by the customer or purchased from us separately.

Tools Needed for Installation

You will need the following tools for installation of this product. You can purchase many of these commonly used tools in our store.

  • 17 mm wrench
  • 19 mm wrench
  • Torque wrench with 19 mm crowfoot wrench
  • 8 mm Allen key for install on crank arms (included in the box)
7 reviews for Favero Assioma DUO-Shi Power Meter Spindles
  1. Mauricio Lopez (verified owner)

    Excelente opción para trabajar con pedales shimano, realmente es fácil su instalación, se sincroniza y configura de forma rápida. Ya tengo Potenciometro para todas mis bicicletas 🙌🏻

    • Power Meter City

      Thank you so much, Mauricio! We are here if there is anything else we can do! Ride safe!

  2. Leslie Bristol (verified owner)

    These worked great EXCEPT, the Q Factor was too wide for my fit. Definitely my fault for not reading the note about it. BUT, I loved them so much I bought the Assioma Duos from powermeter city. Josh from sales made everything easier. Definitely buying all my power meters from PMC. Thank you!

    • Power Meter City

      Glad it worked fine! It was a pleasure doing business with you, Leslie and if there is anything else we can do to help, please let us know!

  3. North Krimsly (verified owner)

    These Duo-Shi power meter pedals from Favero are comfortable, reliable, and trouble-free. I also had the previous Assioma Duo (non Shimano) version of these pedals, also from Power Meter City. Those were good, but this new Duo-Shi version is better. Why better? Because 1) the Shimano cleats are definitely easier to walk in, much less slippery, and 2) most importantly, the Duo-Shi pedals have a wide q-factor of 65mm (with Ultegra pedals). For some people that will be too wide. But, This is a gigantic, game-changing benefit for riders like me who need a wide q-factor for our knees to be free from pain and injury. I used to have to use pedal extenders with the old Faveros, but with the Duo-Shis I don’t have to use extenders and my knees and hips are super happy. I’m setting PRs with these pedals after only a few rides. Because comfortable is fast! I’m very happy I bought these. One thing to know — it’s easy to install the power meter axles into Shimano R8000 pedals but you will need a crowfoots wrench adapter and a torque wrench if you want to tighten the axles to the recommended torque. make sure to set the crowfoot adapter 90 degrees from the wrench so you don’t make the lever arm longer.

    • Power Meter City

      Wow! Thank you for this awesome review, North! We hope you will continue to enjoy your new Favero Assioma DUO-Shi Power Meter Spindles! Good luck on your future rides and please let us know if there is anything else we can help you with! Ride safe!

  4. Chris Manore (verified owner)

    Very pleased. Glad to have the option to upgrade my current pedals at a reasonable price. Easy to install the the app and the spindles, paired easily with my Garmin. Readings are consistent with no dropouts, and accurate when compared with my Powertap. Highly recommend the Assiomas.

    • Power Meter City

      Great choice, Chris! Thank you for this amazing review on your DUO-Shi Power Meter Spindles. We hope you will continue to enjoy them! We are here if there is anything else we can do! Ride safe!

  5. hex29a (verified owner)

    It was very easy to install the Shimano pedal bodies and install the Favero Assioma DUO-Shi power meter on my bike! They work perfect.

    • Power Meter City

      Awesome! Thank you! Glad you are enjoying them. We are here if there is anything else we can do to help. Ride safe!

  6. Bob Masters (verified owner)

    I’m new to power and was impressed with the value of these pedals. Installation was super easy and they work great! Definitely recommend these pedals.

    • Power Meter City

      Welcome to power Bob! You made the right choice in choosing your first power meter! We hope you will enjoy them and good luck on your future rides! Let us know if there is anything else we can do! Ride safe!

  7. Keith Evans (verified owner)

    I took an old pair of Shimano PD-540 and upgraded them to power pedal.

    • Power Meter City

      Hi Keith, great choice! Thanks for this review! (Our first one) If there is anything else we can do, please let us know! Ride safe!

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