Powerfly FS 4 Gen 3 - Trek Bikes (INE)

Overview

'The Powerfly FS blends sporty handling, efficient propulsion and long-distance comfort into a harmonious overall concept. The result: pure riding fun! '

'The jury was enthralled by the upright and comfortable riding position on long tours while the bike also shines on moderate terrain thanks to its fun ride and intuitive handling.'

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Load up to tackle the trails or outings around town with accessories and gear that are compatible with Powerfly.

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Guidelines and tips for protecting and sharing the trails you ride.

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Do this quick pre-ride safety check before you hit the trails.

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Features

RIB is a one-piece battery and cover with a built-in handle that can easily be removed and re-installed in the frame with no tools and no hassle. It’s the most convenient way to remove your battery for transport, security or just easier charging.

Watch the video

The Bosch Performance Line CX sets the standard for eMTB performance with up to 85 Nm of torque and an intelligent eMTB mode with Extended Boost that automatically adjusts the amount of assist based on the terrain.

The Bosch smart system LED remote lets you easily change assist modes, activate walk mode or turn on optional lights. The bright LEDs are easy to see in any light, and show you your battery level and assist mode at a glance.

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Active Braking Pivot allows our engineers to tune how the suspension reacts to acceleration and braking forces independently. That means you get more confident control when you need it most.

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The new eBike Flow app turns your ride into a personalised experience. Use it to customise your motor's assist behaviour, track your ride stats and integrate your data with apps like Strava and Apple Health. There's even handy features like navigation and service reminders.

Bosch eBike Flow app and associated features are not available in all markets. Check with your local Trek retailer for details.

Deck out your Powerfly FS with our favourite compatible accessories

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Pedals are two of the five touchpoints that connect you with your bike, and even though this bike comes with a pair, upgrading to pedals that boost control and grip will greatly improve your ride. See the pedal guide and find the best pedals for your riding style. We recommend flat pedals for simple versatility.

See the guide

This suspension calculator will help you optimise your suspension settings for your riding weight. Simply follow the steps to find your best set up.

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You've got one less detail to sweat with the integrated speed sensor. The chainstay-mounted sensor stays protected while the custom hub-mounted magnet stays secure – no more error codes from mis-aligned sensors.

The right wheel size paired with your frame size gives you the perfect combination of responsiveness and control.

Chainstay mounts make it easy to install a rear kickstand that stays out of your way and supports bikes of all sizes. No more laying or leaning.

Use the remote lever to lower your saddle so it's out of your way when you're descending and cornering.

Specs

Frame	Alpha Platinum Aluminium, Removable Integrated Battery (RIB), tapered head tube, internal routing, Motor Armour, rocker link, rack and mudguard mount, ABP, Boost148, 100 mm travel
*Fork	Size: XS , S SR Suntour XCR 34, air spring, LO R damper, hydraulic lockout, tapered steerer, 44 mm offset, oversized crown for eMTB, Boost110, 15 mm bolt-on thru axle, 100 mm travel
Size: M , L , XL SR Suntour XCR 34, air spring, LO R damper, hydraulic lockout, tapered steerer, 44 mm offset, oversized crown for eMTB, Boost110, 15 mm bolt-on thru axle, 120 mm travel
Shock	SR Suntour Edge R, 190 mm x 45 mm
Max compatible fork travel	120mm (XS and S: 520mm axle-to-crown, M and up: 545mm axle-to-crown)

Hub front	Bontrager sealed bearing, alloy axle, 6-bolt, Boost110, 15 mm thru axle
Hub rear	Bontrager alloy, sealed bearing, alloy axle, 6-bolt, Shimano 8/9/10 freehub, Boost148, 12 mm thru axle
Skewer rear	Bontrager Switch thru-axle, removable lever
Rim	Alex MD35, tubeless compatible, 32-hole, 35 mm width, Presta valve
Spokes	14 g stainless steel, black
*Tyre	Size: XS , S Bontrager XR3 Comp, wire bead, 30 tpi, 27.5x2.35"
Size: M , L , XL Bontrager XR3 Comp, wire bead, 30 tpi, 29x2.30"
Max tyre size	Frame: 29x2.40" (XS & S: 27.5x2.60"), Fork: See manufacturer

Battery	Bosch PowerTube 625 Wh, smart system
Charger	Bosch standard 2A, 230V, smart system
Controller	Bosch Intuvia 100, smart system
Computer	Bosch LED remote, smart system
Motor	Bosch Performance Line CX, smart system, magnesium motor body, 85 Nm

Shifter	Shimano Deore M4100, 10 speed
Rear derailleur	Shimano Deore M5120, long cage
Crank	FSA Bosch CK-220, 36T ring, 165 mm length
Chainring	FSA, 36T, steel
Cassette	Shimano Deore M4100, 11-46, 10-speed
Chain	KMC X10, 10-speed
Pedal	VP-536 nylon platform
Max. chainring size	1x: 46T, min 34T

Saddle	Bontrager Arvada, steel rails, 138 mm width
*Seatpost	Size: XS , S , M TranzX JD-YSP18, 100 mm travel, internal routing, 31.6 mm, 361 mm length
Size: L , XL TranzX JD-YSP18, 130 mm travel, internal routing, 31.6 mm, 425 mm length
Handlebar	Bontrager alloy, 31.8 mm, 15 mm rise, 720 mm width
Grips	Bontrager XR Trail Comp, nylon lock-on
*Stem	Size: XS , S Bontrager Comp, 31.8 mm, Blendr compatible, 7-degree, 60 mm length
Size: M , L , XL Bontrager Comp, 31.8 mm, Blendr compatible, 7-degree, 70 mm length
Head set	FSA IS-2
Brake rotor	Tektro, 6-bolt, 203 mm
Brake Set	Tektro HD-M275 hydraulic disc
Rotor size	Max brake rotor sizes - Frame: 203mm, Fork: see fork manufacturer

Weight	M - 25.23 kg / 55.63 lbs
Weight limit	This bike has a maximum total weight limit (combined weight of bicycle, rider and cargo) of 136 kg (300 lb).

Sizing

How tall are you?

To measure your height, stand up straight, barefoot, with your back, heels, shoulders and head all touching a wall. While looking straight ahead, place a book or straight edge on your head and slowly push it against the wall. Your straight edge should be parallel with the floor. Mark the spot where the bottom of the book is touching the wall. The distance from the marked spot to the floor is your height.

What is your inside leg?

How to measure: Stand barefoot with your back straight and against a wall. Tuck a ruler or something that extends to the floor between your legs. Using both hands, and keeping it level, pull the ruler up into your crotch as if you were sitting on the saddle. Measure the distance from the top edge of the ruler to the ground to find your inside leg measurement. Your inside leg is very important to your final bike size so please measure carefully.

Geometry

Service

Reviews

'Powerfly FS wins Best in Test'

E-MTB Category Winner

More options

FAQ

Powerfly-compatible accessories

How to ride on mountain bike trails

Five things to do before every mountain bike ride

Removable Integrated Battery

Bosch Performance Line CX motor

Bosch LED Remote

Active Braking Pivot

Bosch eBike Flow app

Trail-ready gear

Upgrade your pedals and love your bike more

Suspension Calculator

Integrated speed sensor

Smart Wheel Size

Rear kickstand mount

Dropper post

How tall are you?

What is your inside leg?

'Powerfly FS wins Best in Test'

E-MTB Category Winner

More options

FAQ

Powerfly-compatible accessories

How to ride on mountain bike trails

Five things to do before every mountain bike ride

Product features

Removable Integrated Battery

Bosch Performance Line CX motor

Bosch LED Remote

Active Braking Pivot

Bosch eBike Flow app

Trail-ready gear

Upgrade your pedals and love your bike more

Suspension Calculator

Integrated speed sensor

Smart Wheel Size

Rear kickstand mount

Dropper post

How tall are you?

What is your inside leg?