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SRM FSA K-Force Light Wireless Powermeter Crankset

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Item # SEM0009

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Item # SEM0009


It's hard to speak of carbon innovation in cycling without mentioning FSA, and as a leading developer of carbon components, it was only natural that someday FSA would cross paths with the titan of power, SRM, to meet the demands for a K-Force Light powermeter. Well, both parties met, shared brains, and the result is the FSA K-Force Light Wireless Powermeter Crankset. Combining pinpoint measurement accuracy with FSA's hallmark rigidity, the K-Force Light Powermeter will satisfy the needs for anyone seeking the ultimate in power training.

The FSA K-Force Light Wireless Powermeter blends precise power measurement with lightweight rigidity. This is due to a hand-in-hand development period between FSA and SRM engineers. The goal was to pair the stiff, weight saving attributes of the K-Force Light's hollow-arm carbon crank with an accurate wireless power recording system, without scaling back the adored quality of either device. Easier said than done. However, SRM pulled this off by leaving the carbon arms unaltered, CNC machining a new rigid spider, and improving the design of the meter's strain gauges. The eight strain gauges for the Powermeter are a system of sensors that detect any resistance and vary their output when experiencing applied force. The next step is for the strain gauges to convert this data into electrical resistance so it can be measured. The refinements to the system offer stellar results. The K-Force Light expresses an accuracy of +/- 2.0% between 30 and 255 rpm with a wattage range between 0 and 4096 watts. Compared to the new G3 PowerTap that has the same range of accuracy, but only between 40 and 130 rpm, the SRM Powermeter has nearly doubled the system accuracy of its greatest competitor while shaving grams in the process. You can also expect a weight savings over other power measurement systems, as the K-Force Wireless Powermeter weighs in around an alarmingly low 806g with cranks, Powermeter, and chainrings. SRM also extended the battery life of the K-Force PowerMeter to roughly 1400 hours, and provides a three-year manufacturer's warranty.

To provide a comfortable duration in the saddle, the K-Force Light Powermeter provides a wide-stance U and Q factors of 150mm. More importantly though, FSA did this while retaining a smooth rolling power transfer for which the K-Force Light crankset has become synonymous for through three generations of development. The crankset spins with minimal friction on a ceramic bearing bottom bracket that provides a direct line of power to the rear wheel.

The FSA K-Force Light Wireless Powermeter Crankset is available in crankarm lengths of 170mm, 172.5mm, and 175mm, and in both standard and compact configurations. For both options, the chainrings are available in both Shimano/SRAM 10-speed, and Campagnolo 11-speed, compatibilities.  The crankset comes with the FSA BB-8200 Ceramic bottom bracket and for the English threaded standard. The Powermeter operates wirelessly with ANT+ Sport, and is being offered as a standalone item. However, it is compatible with PowerControl 7, PowerControl VI, Garmin Edge 800, and Garmin Edge 500 CPUs.

Tech Specs

Arm Material:
carbon fiber
Arm Length:
170 mm, 172.5 mm, 175 mm
Chainring Sizes:
53 / 39 t, 50 / 34 t
Bolt Circle Diameter:
130 mm
Bottom Bracket:
FSA BB-8200 ceramic
BB Threading:
Claimed Weight:
898 g
Recommended Use:
Power training, Road racing, Road cylcing

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