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FSA Road PowerBox Alloy Crankset Power Meter

Josh Matthew December 15, 2020
5.00 out of 5 based on 2 customer ratings
(2 customer reviews)


Proven technology, tons of features, and the most affordable crankset-based power meter on the market

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FSA Road PowerBox Alloy Crankset Power Meter

The FSA Road PowerBox Alloy Crankset Power Meter is a crank-based power meter, measuring single-leg power at the spider. Specifically, it uses Power2Max’s proven spider design. The FSA PowerBox Alloy uses FSA’s 7075 aluminum 110 mm BCD chainrings, FSA alloy arms and a BB386EVO 30 mm spindle. The power meter uses a CR2450 battery (which is very easy to replace), gets approximately 400 hours of battery life and is accurate to within 2% (industry standard). The result is an accurate, extremely versatile power meter that comes with top-notch FSA chainrings and crank arms. Best yet, the FSA power meter is the most affordable crankset-based power meter on the market.



Accurate, Reliable and Consistent

The PowerBox uses Power2Max’s proven spider design. This technology has been proven to be an accurate, reliable and consistent way to measure power.

Most Affordable Crank-Based Power Meter

The crankset is an ideal place to measure power. You don’t have to make any compromises to your component selection. And at $649, it is the most affordable crank-based power meter available.

Easy Zero-Offset

The PowerBox has Auto Zero and will automatically perform a zero-offset every time you stop pedaling for at least three seconds.

User Friendly Battery

The CR2450 battery on the FSA power meter is cheap to replace, easy to change (located on the outside of the crankset) and provides 400 hours of battery life.


Some crank-based power meters use magnets to measure cadence. The Powerbox however uses an accelerometer, allowing it to measure cadence internal to the power meter.

Freedom to Change Chainrings

The PowerBox is compatible with a wide range of chainrings. In addition, you can change out your rings at any time and there is no need for re-calibration.


  • Chainring sizes: 50/34 | 52/36 | 53/39
  • Crank arm lengths: 170 mm | 172.5 mm | 175 mm


Upgrade Options

  • Left/Right Power Balance: The Left/Right Power Balance upgrade allows you to see your estimated left/right power balance. That is, how much power each leg is generating. Please note, this requires a bicycle computer that is capable of displaying left/right data (most new computers are). The cost of this upgrade is $50
  • Bluetooth SMART: The PowerBox comes with ANT+ capability. At any time, you can upgrade it to a dual ANT+|Bluetooth SMART unit. The cost of this upgrade is also $50

Both of these upgrades bring the price to $748.99. This is still a very attractive price for a power meter that would be fully loaded.


FSA Power Meter Compatibility

FSA Road PowerBox Alloy Crankset Power Meter uses a BB386EVO 30 mm axle. This makes the power meter compatible with virtually every frame set when used with the correct bottom bracket and spacers.

The chainrings are compatible with the following groupsets:

  • Shimano 10- and 11-speed groupsets
  • SRAM 10- and 11-speed groupsets
  • Campagnolo 10-speed groupsets


In the Box

  • FSA Road PowerBox Alloy Crankset Power Meter
  • 2450 coin cell battery
  • Quick Start guide


FSA Road PowerBox Alloy Crankset Specs

NameFSA Road PowerBox Alloy
Bike TypeRoad
Location of Power MeasurementSpider
Left or Both Legs MeasuredBoth
Independent Left/Right MeasurementYes (estimated) - with system upgrade
InstallationMore involved (60 min. estimated)
Communication ProtocolANT+. Bluetooth SMART with system upgrade
Claimed Accuracy+/- 2.0%
Weight921 grams
Battery Type2450 coin cell
Battery Life400 hours
Method of Cadence MeasurementAccelerometer
Warranty2 years


2 reviews for FSA Road PowerBox Alloy Crankset Power Meter
  1. dan verner

    Super excited to have this powermeter on my commuter bike for over 2 months now. The mfg date is a couple years back but what a great price!!!

    • Power Meter City

      Hi Dan. Thank you for taking us time to leave a review on your FSA, we really appreciate it and are here if there is anything else we can do.

  2. Bryan (verified owner)

    Easy set up. No dropped data. 100% accurate. Battery life seems to be more than adequate. The only thing better has been the customer service support given by PMC – 2nd to none!

    • Power Meter City

      Hi Bryan. Thanks for the review! This is such a rock-solid unit. It doesn’t get the attention it deserves. $650 for a crank-based PM with these features is a sweet deal. Glad you like it!

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