Aluminium full-suspension electric mountain bike Trek Powerfly+ FS 8 blue: Bosch CX 800 Wh, GX AXS, 24.48 kg

Trek Powerfly+ FS 8 Mulsanne Blue: wireless shifting

The Trek Powerfly+ FS 8 Gen 4 is the top of the Powerfly+ FS range: wireless SRAM GX Eagle AXS drivetrain, 130 mm Fox 36 fork, 120 mm Fox Float Rhythm shock, Bosch CX motor and 800 Wh battery. It is also the lightest of the family, at 24.48 kg in size M (Trek figure). The Matte/Gloss Mulsanne Blue colourway alternates a matt midnight blue with gloss sections in the same blue.

Technical specifications

Who is it for?

For the demanding mountain biker who wants precise shifting in all conditions and a complete spec, without moving to an enduro e-MTB that is heavier to ride. It suits regular riders who head out several times a week.

The LVR workshop view

The ABP pivot, key to the aluminium frame. The ABP pivot, located on the rear axle, separates braking forces from the work of the suspension: when you brake hard on a broken-up slope, the shock keeps tracking the ground instead of stiffening up. Combined with the UDH hanger, which takes the T-Type derailleur directly, this aluminium frame gives this FS 8 a sound base for high-end components.

Put simply: at 24.48 kg in M, this FS 8 is the lightest Powerfly+ FS in our selection, and the only one to combine the Kiox 300 colour display with a wireless SRAM AXS drivetrain. It is the full-suspension Powerfly+ for anyone who wants the most complete spec without leaving the aluminium frame behind.

The GX Eagle AXS T-Type derailleur mounts directly to the frame's UDH hanger and doesn't rely on any cable: no housing to clog up, no tension to readjust. Under the motor's torque, shifting stays crisp, and the XS-1275 10-52 cassette offers a very wide range for the ramps of the Espinouse.

The Fox 36 fork, with its Float EVOL spring and GRIP damper, brings welcome stiffness in rock gardens, where a slimmer fork would flex. The Bosch assist remains restricted to 25 km/h and 250 W rated, as on any European e-bike; the Kiox 300 display shows your data and is updated with the Bosch eBike Flow app.

Which Powerfly+ FS should you choose?

Our take: at 24.48 kg in M, this FS 8 is 600 g lighter than the Shimano FS 6 (25.08 kg). The XT Di2 FS 8 offers a 150 mm fork for 24.88 kg; the Rail+ 8, for enduro, moves up to 160 mm at both wheels (25.08 kg).

Your questions

Why buy from LVR Cycles? As a Trek retailer in Béziers, we pair and update your AXS drivetrain, set up the Fox 36 and shock, and handle the Bosch diagnostics for your Powerfly+ FS 8.

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