FSA's MTB PowerBox Carbon Crankset employs a P2M convertible spider design for multiple chainring options. FS´s crank arms and BB392EVO spindle mated together produce a stiff, reliable, extremely versatile power meter crankset available with a double or single chainring 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. 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 (included):- 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+.Features:- Convertible spider design for different chainring and chainline configurations- Hollow carbon composite arms with UD finish- BB392EVO 30mm AL 7050 alloy spindle fits every MTB frame (purchase BB separately)- AL7075 100% CNC chainrings- Thick-Thin tooth design for maximum chain engagement- Optimized for 11 and 12 speed systemSpecifications: - Type: Powermeters- Technology: BB392, Hollow Carbon, Megatooth, Modular, No- Discipline: MTB- Series: POWERBOX- Compatibility: BB392- Drivetrain Compatibility: Shimano10/11S, Sram10/11S, Shimano10S, Sram10S- Material: Carbon