Aluminium full-suspension electric mountain bike Trek Powerfly+ FS 6 black: Bosch CX 800 Wh, 10-51, 25.08 kg

Trek Powerfly+ FS 6 Dark Star: the e-MTB for big-climbing days

With its 800 Wh Bosch PowerTube battery and Performance Line CX motor, the Trek Powerfly+ FS 6 Gen 4 is built for days when the climbing piles up. 130 mm Fox AWL fork, 120 mm Fox Float Rhythm shock, 12-speed drivetrain with Shimano XT derailleur: Trek quotes 25.08 kg in size M. Its Gloss Dark Star/Matte Dark Web finish plays on two blacks, gloss and matt.

Technical specifications

Who is it for?

For the mountain biker who heads out for the day towards the Espinouse or the Montagne Noire, links climb after climb and wants to get home without counting every percent of battery. It is also aimed at groups where everyone rides an e-MTB and loops often exceed 50 km.

The LVR workshop view

Alpha Platinum and Mino Link, a frame you can adjust. On this version, it is the Mino Link adjustable geometry that deserves attention: a small reversible insert at the rocker link slightly changes the bottom bracket height and the frame angles. High setting to keep the pedals clear of rocks on technical climbs, low setting for a more planted feel on fast descents. All on Alpha Platinum aluminium that takes the punishment without complaint.

Put simply: this FS 6 brings together three upgrades over the FS 4: the 12-speed drivetrain, the 800 Wh battery and Fox suspension. At 25.08 kg in M, it weighs 200 g less than the 600 Wh FS 4, while carrying 200 Wh more.

The long-cage Shimano XT derailleur handles the Deore 10-51 cassette precisely, even under the motor's torque. The 51-tooth sprocket lets you climb steep ramps at a high cadence, which takes the strain off the motor and saves battery. We recommend easing off the pedals for a moment as you shift.

The Fox Float Rhythm shock offers two positions: open for descents, firmer for long link tracks. Bosch limits the assist to 25 km/h, with 250 W rated, in line with the European standard; beyond that, it's down to your legs. The Purion 200 controller is updated via the Bosch eBike Flow app.

Which Powerfly+ FS should you choose?

Our take: with 800 Wh, this FS 6 weighs 200 g less than the 600 Wh FS 4 (25.28 kg) and 420 g less than the FS 4 800 Wh. For the Kiox 300 display and wireless shifting, the FS 8 drops to 24.48 kg.

Your questions

Why buy from LVR Cycles? In Béziers, we prepare your Powerfly+ FS 6 for long rides: Fox set-up, advice on battery management and servicing of the 12-speed drivetrain.

Please note that the specifications may be changed without prior notice by the manufacturer, based on the availability of components and other factors.