FSA K-Force PowerBox Team Edition

The K-Force PowerBox Team Edition is FSA's power meter crankset built for riders who want direct power data without sacrificing crank stiffness or weight. This latest edition adds left and right Bluetooth connections for balance accuracy, and drops weight to 690 grams — making it one of the lightest and stiffest power meter cranks available.

FSA notes that weight and stiffness are the specific reasons its Pro Tour teams have chosen this crank during competition, which matters because a power meter crank that flexes under load introduces measurement error along with lost efficiency. The crank combines hollow 3K carbon fiber arms with a carbon composite construction and CNC-machined chainrings.

Who It's For

• Racers and serious training riders who want left/right power balance data built into the crank itself
• Riders on BB386EVO-compatible frames looking for a direct-mount chainring interface
• Not necessary for riders who don't train or race with power data — this is a power meter crank first

What to Look For

• Compatibility: uses a 30mm BB386EVO spindle and Direct Mount chainring interface — confirm your frame's bottom bracket standard before ordering
• Chainring size: available in 53/39T, 52/36T, 50/34T, 48/32T, and 46/30T (11-speed) — pick based on your terrain and gearing needs
• Crank length: offered in 165, 167.5, 170, 172.5, and 175mm — get properly fit rather than guessing

Key Features

Arms: Hollow 3K carbon fiber arms combined with a carbon composite construction achieve the crank's 690-gram weight without compromising the stiffness a power meter crank needs for accurate readings.

Power meter: Left and right Bluetooth connections provide independent power balance data, which is the crank's core feature and what separates it from a standard non-instrumented crankset.

Chainrings: AL7075 100% CNC-machined chainrings in a Direct Mount format pair with a 30mm CNC-machined AL7050 BB386EVO spindle.

Weight: At 690 grams for the 53/39T configuration, it's positioned by FSA as one of the lightest and stiffest power meter cranks on the market.

Rider Intent Summary

• Biggest strengths: left/right Bluetooth power balance in a 690-gram crank — light for the power meter category
• Tradeoffs: requires a BB386EVO-compatible frame, and Direct Mount chainrings limit aftermarket chainring options to that standard
• What makes it different: FSA's own Pro Tour teams use this specific crank in competition, citing its weight and stiffness as the deciding factors

Victory's Take

At Victory Bicycle Studio, we recommend the PowerBox Team Edition to racers who train and race with power data and don't want to compromise crank stiffness to get it.