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The FSA MTB Carbon PowerBox is an ultralight fundamental tool that will help athletes track their data directly during both training sessions and races: in fact, the many advantages provided during a race are much more important than a few grams difference.


A +/-2% accuracy precision is the key quality you want in a power meter. Nowadays, powermeter cranks represent a fundamental tool that will help riders track their data directly during training sessions and to be increasingly more competitive on race day.


The PowerBox Alloy Crankset is very attractively priced and is backed by consistent and reliable performance.


Team Trek Selle San Marco


FSA’s MTB PowerBox Alloy Crankset employs a P2M convertible spider design for multiple chainring options. FSA's alloy arms and BB392EVO spindle mated together produce a very lightweight, extremely versatile power meter crankset available with a double chaining configuration.

Now available for download and purchase are the PowerBox Upgrades for the FSA PowerBox giving additional data during the ride and for analyzing your training sessions. Upgrades available are:

Bluetooth (included)
With this upgrade your FSA PowerBox can transmit data via Bluetooth Low Energy (BLE or Bluetooth Smart) to your bike computer.

Left/Right-Balance (upgrade)
The L/R balance shows you the percentage each leg is contributing to your total power output. (power left = pressure on the left pedal + pull up on the right pedal; power right = pressure on the right pedal + pull up on the left pedal).

Pedal Smoothness (upgrade)
Pedal smoothness is an advanced metric for riders who want to optimize their pedaling. It shows you how evenly power is applied throughout the whole 360 degree pedal rotation. FSA PowerBox power meters collect the data for both legs combined. Please note that transmission of this data to your bike computer is only possible via ANT+.

Torque (upgrade)
Torque is an interesting value especially for sprinters and track riders who want to measure their peak power output. This value shows you the power independent from your cadence. Please note you must check if your bike computer can show the torque value before upgrading your FSA PowerBox.


How? Go to the Support page on our website, log in and buy the upgrades you need following the instructions.




  • Cold forged AL6061/T6 aluminum crank arms
  • BB392EVO 30mm AL 7050 alloy spindle fits every frame (purchase BB separately)
  • AL7075 100% CNC chainrings
  • BCD: 96/68mm
  • Optimized for 11-12 Speed systems
  • Including - Bluetooth
  • System upgrades*: Left/Right-Balance; Pedal Smoothness; Torque upgrade
  • Spider-based power sensors provide total power output measurement of both legs, with Left & Right leg output analysis available with system upgrade*

*System upgrades available >here<


Code Type
328-0339433090 FSA POWERBOX Alloy 1x 32T 170mm
328-0339435090 FSA POWERBOX Alloy 1x 32T 175mm
328-0339473090 FSA POWERBOX Alloy 1x 34T 170mm
328-0339475090 FSA POWERBOX Alloy 1x 34T 175mm
328-0339013090 FSA POWERBOX Alloy 1x 36T 170mm
328-0339015090 FSA POWERBOX Alloy 1x 36T 175mm


Type Powermeters
Technology BB392EVO, Megatooth, Modular
Discipline MTB
Bolt Circle Diameter (BCD) 96
Crankset Type Single
Drivetrain Compatibility Shimano11/12S, Sram11/12S
Holes Number 4
Length 170; 175
Material Alloy
Teeths Number 32; 34; 36