FSA introduces complete electronic drivetrain with the K-Force WE

New wireless groupset set for 2017

FSA has aimed to be a complete component manufacturer for years, but it took a while to create a complete groupset — excluding the aero TT group presented by FSA's sister brand Vision a few years ago. The new FSA K-Force WE group is set to be in stores March 2017, and price predictions from FSA are between the Dura-Ace Di2 and Sram eTap bracket.

Five years in development and tried and tested over two years by FSA’s engineers, and more recently by the WorldTour teams FSA sponsors, the WE groupset has been a long time coming. Over the years we’ve seen with various prototypes and design studies from the brand and as it stands the WE system has 11 patents so far either set or pending against the design.

This new group is based around wireless transmission from the levers to the derailleurs, but the derailleurs themselves run via a wired internal mounting battery. It's a similar design to Shimano’s current tube-shaped battery. The shift levers use a coin cell each to power to the microswitches and ANT+ transmitter.

FSA also looked to address ergonomics by offering the shifters in two sizes: compact and standard (which is 6mm longer than the compact version), to fit more riders while still retaining adjustability in the lever reach. The curvy brake lever shape feels good in the hands and the rocker-shaped gear switches offer a point of difference between K-Force and its more established rivals.

The WE shifter has two options on brake lever length, adjustable reach and uses a rocker style switch for shifting
The WE shifter has two options on brake lever length, adjustable reach and uses a rocker style switch for shifting

ANT+ with added privacy

The ANT+ protocol means that the system is built around a tried and tested system so it will communicate with most GPS computers, power meters and heart rate monitors straight out of the box.

Shifting is handled by a rack and pinion design which FSA claims will offer a precise, quiet and fast shift between rings

The ANT+ protocol for shifting is customised from standard, so it has its own network key and security to ensure FSA can rule out interference and potential hacks. It’s a different approach to SRAM’s ground-up wireless protocol build, and whilst we've been assured that FSA has fully tested the system for security we still feel a little more nervous about it than eTap’s proprietary Airea protocol.

FSA believes that combining both wires and wireless is the best solution for electronic drivetrains. The use of wireless between the shifters and derailleurs not only eliminate wires but junction boxes too, which makes for a cleaner-looking bike with aerodynamic advantages.

The 7.4v Li-ion battery is stored inside the seat tube, and has a claimed 4-6,000km run time, which a claimed charge time of 1.5 hours.

The 7.4v Li-ion battery is stored inside the seat tube
The 7.4v Li-ion battery is stored inside the seat tube

Componentry: internals, style and finish

The finish is all high-end carbon and composites, and there's a new design that sees gold flash highlights, which differs from the standard K-Force. The crankset is a BB386 EVO unit with hollow carbon construction and the new chainrings have twin pins designed specifically for the WE group. No weights were given for the crank, but we’d expect it to sit in line with the subtly different shaped, but same grade, K-Force light unit at 589g.

There's also a dedicated app for mobile and desktop, which provides a constant link to each part of the system

The rear derailleur has an internal gearbox design with three timing gears, which activate the shifts with constant and absolute alignment meaning the derailleurshould never need trimming. The large unit built into the top of the front derailleur houses the system's brain and the ANT+ transmitter.

Shifting is handled by a rack and pinion design that FSA claims will offer a precise, quiet and fast shift between rings and that the 16t differential between rings should give most people the ideal combination (50/34, 52/36, 53/39). All of the gears are constructed out of metal (a mixture of titanium, brass and steel), which sounds like they’ve been built to last.

The cassette is built from steel and titanium for a low 257g weight, and is made up of two blocks of three at the low end and a succession of separate sprockets for the remainder. With ranges of 11-25, 11-28 and 11-32 WE certainly offers plenty of choice for plenty of riders. The matching K-Force chain uses hollow pins to keep the weight down and the sculpted plates have been designed to reduce noise and be durable. The chain is claimed to weigh 246g (114 links).

The K-Force WE chainset is styled subtly different to the standard K-Force and features gold graphics. The chainring's twin pin design is also exclusive to the WE group
The K-Force WE chainset is styled subtly different to the standard K-Force and features gold graphics. The chainring's twin pin design is also exclusive to the WE group

The K-Force brakes feature an integrated QR adjuster, standard or direct mount fitment, and a rim capacity from 18 to 28mm wide. They tip the scales at 299g a pair.

FSA knows that discs are becoming an evermore more popular option and are destined for pro racing too, so a disc brake option is imminent

FSA states that the complete weight of WE at 2,090g, that’s 120g heavier than eTap and 45g heavier than Dura-Ace Di2, although the weight differences are hardly a deal breaker in our book.

There's also a dedicated app for mobile and desktop, which provides a constant link to each part of the system. WE allows you to customise each shifter's operation (and each movement of the rocker switch) and it counts the number of shifts at both front and rear to keep on top of maintenance schedules.

You can also customise the power settings, so you can tell the bike when to go into standby mode — in conjunction with the counter system you can allocate power to where it's used most (front or rear mech) to make the most of available power. The app will also tell you how much battery life is remaining too.

The front mech features LEDs that let you know battery level, so you don't have to rely just on the app
The front mech features LEDs that let you know battery level, so you don't have to rely just on the app

Customise and perform diagnostics using the dedicated app
Customise and perform diagnostics using the dedicated app

2017 pro season

Pro teams Astana, Cofidis, Direct Energie, Skydive Dubai and Jelly Belly will all be using FSA’s WE next season, FSA says.  

Outside of pro racing, discs are becoming more popular, so a group with rotors is imminent. FSA has had demo bikes fitted with what looks to be a pretty much complete group with the shifter profile no taller than the standard lever (a la SRAM), but certainly longer in the body and slighter wider (a bit like Shimano’s 105 unit, though not as bulbous).

FSA also confirmed a 1x option for gravel and cyclocross and a TT version along with accessory sprint shift buttons to add to the road system.

FSA K-Force WE: high-tech electronic groupset
Warren Rossiter

Senior Technical Editor
Approaching two decades of testing bikes, Warren can be found on a daily basis riding and exploring the road and off roads of Wiltshire's Salisbury Plain in the UK. That's when he's not travelling the world to test the latest kit, components and bikes.
  • Discipline: Road
  • Preferred Terrain: Big, fast descents and rough surfaces like cobbles or strada bianca
  • Current Bikes: Decade Tripster ATR, Dedacciai Temarario, Cannondale Synapse, BMC Granfondo Disc Di2, Genesis Day One CX, Parlee Z Zero Custom, Storck Scenario Comp Custom, DMR Trailstar, Bianchi Pista, Cube SUV 29er e-bike
  • Dream Bike: Bianchi Oltre Disc, Bianchi Specialissima, Cannondale Slate, Buffalo Bike
  • Beer of Choice: Brew Dog Punk IPA
  • Location: Wiltshire, UK

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