The Powerfly 4 is our most affordable eMTB. It scores vital parts, such as the smoothly shifting Shimano drive and the powerful Bosch motor. It also comes with our easy-to-use Removable Integrated Battery (RIB) that is completely embedded in the frame and requires no tools to insert and remove. This bike broadens your horizons and lets you explore places you never thought you could reach on a mountain bike.
It's the right bike for you if…
… you are convinced of the e-bike revolution, and you want the performance and versatility of a mountain bike at a price that makes it easier for you to leave your car behind more often. You want more significant, more exciting off-road adventures, and you know that an eMTB is the best way to make them happen.
You get this equipment.
A robust, high-quality aluminium frame with an elegantly integrated, long-lasting 500 Wh battery, a Performance CX motor from Bosch with 250 watts of power and 85 Nm of torque for pedal assistance up to 25 km/h, a Bosch Purion controller, a 1×10 drive from Shimano and a suspension fork with lockout function. Thanks to Smart Wheel Sizing, every rider also benefits from the best fit: 29" wheels on larger frames 27.5" wheels on smaller frames.
Our last word
Our most affordable eMTB comes with the same powerful Bosch motor and intuitive controller as our most expensive eBikes, but with a smaller battery and more affordable parts.
Why you will love it
- Trek's Removable Integrated Battery System looks good and is user-friendly: It's fully integrated into the frame and therefore well protected, but can be easily removed without tools and even has space for a drinking bottle holder
- This bike expands horizons: The first-class Bosch system is equally suitable for the daily commute, for leisure-oriented rides and for a great time on the trail
- The Purion controller has a Walk Assist function and an intelligent eMTB mode that automatically supplies the required power depending on the terrain
- Thanks to the external charging connection, you can easily and conveniently charge the battery in the frame or when it is removed
- You can further optimise the versatility of your Powerfly by equipping it with a luggage rack and mudguards. In addition, thanks to pre-installed cables, you can easily mount lighting that is powered directly by the bike battery.
Features
Does my bike have a curved top tube?
Smaller frames (S) have a top tube that curves just before the seat tube. This design allows for a lower standover height, accommodating smaller riders who will find it easier to mount. The larger frames (M and ML) have a straight top tube because taller riders usually don't have a problem with standover height.
Bosch Performance Line CX engine
The Bosch Performance Line CX sets new standards with its performance of up to 85 Nm torque and an intelligent eMTB mode with Extended Boost, which automatically adjusts the support level to the terrain.
Removable Integrated Battery
RIB (Removable Integrated Battery) is a one-piece battery and cover combination with a built-in handle that can be easily removed from the frame and replaced without tools. Thanks to this feature, it is extremely convenient to remove the battery from the bike for transport, for securing or for easier charging.
What is the range?
The range assistant from Bosch shows you how far you can ride your eMTB on one charge. The data we preset for an average rider and for this bike model can be changed by you for a more accurate estimate of the range.
engine armour
Lightweight yet strong, this unique shield protects the motor from rocks, wood and other debris on the trail.
Luggage Rack Eyelets
Going on a big tour? Luggage rack eyelets make transport tasks a breeze.
Let there be light
The cables routed inside the frame enable uncomplicated retrofitting with additional lighting. Go to your retailer and get help choosing and installing your lights.
Smart Wheel Size
The optimal wheel size and "your" frame size are the perfect combination for agility and control on the trail.
Alpha Platinum Aluminium
Our lightweight, premium aluminium is continuously cold extruded and multi-butted, then hydroformed into complex tube profiles for maximum strength and minimal weight.
Rear side stand mount
Chainstay mounts allow for the installation of a jiffy stand that supports bikes of all sizes and stays out of the way when not in use. Gone are the days when you always had to lay your bike down or lean it against it.
Technical specifications
*Unless otherwise noted, features apply to all sizes
frameset
framework | Alpha Platinum Aluminum, Removable Integrated Battery (RIB), Tapered head tube, Control Freak internal routing, Motor Armor, Boost148 |
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*Fork | Size: XS SR Suntour XCM 34, coil spring, preload adjust, lockout, tapered steerer, 44mm offset, Boost110, 15mm thru axle, 80mm travel |
Size: S , M , L , XL SR Suntour XCM 34, coil spring, preload adjust, lockout, tapered steerer, 44mm offset, Boost110, 15mm thru axle, 120mm travel |
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Size: S , M , L , XL SR Suntour XCM 34, coil spring, preload adjust, lockout, tapered steerer, 44mm offset, Boost110, 15mm thru axle, 120mm travel |
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Max compatible fork travel | 120mm (XS & S: 100mm) |
impellers
VR hub | Formula DC-511, 6-bolt disc mount, Boost110, 15mm thru axle |
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rear hub | Bontrager alloy, sealed bearing, alloy axle, 6-bolt, Shimano 8/9/10 freehub, Boost148, 12mm thru axle |
HR quick release | Bontrager Switch thru-axle, detachable lever |
rim | Bontrager Connection, double wall rim, 32 holes, 20 mm inner width, Presta valve |
spokes | 14g, stainless steel |
*Tires | Size: XS , S Bontrager XR3 Comp, wire bead, 30 TPI, 27.5 x 2.35 |
Size: M , L , XL Bontrager XR3 Comp, wire bead, 30 TPI, 29 x 2.30 |
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Max tire size | Frame: 29 x 2.60 or 27.5 x 2.8 (XS & S: 27.5 x 2.60) Fork: To the manufacturer |
drive
shifter | Shimano Deore M4100, 10-speed |
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rear derailleur | Shimano Deore M5120, long cage |
crank | FSA Bosch CK-220, 36 teeth, 165 mm crank arm length |
cassette | Shimano Deore M4100, 11-46 teeth, 10-speed |
Chain | KMC X10, for 10-speed cassette |
pedal | VP-536, nylon platform |
Max chainring size | 38T |
components
saddle | Bontrager Commuter Comp |
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*Seat post | Size: XS , S Bontrager alloy, 31.6mm, 12mm offset, 330mm length |
Size: M Bontrager alloy, 31.6mm, 12mm offset, 360mm length |
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Size: L , XL Bontrager alloy, 31.6mm, 12mm offset, 400mm length |
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*Handlebar | Size: XS , S Bontrager made of aluminum, 31.8 mm, 15 mm rise, 720 mm width |
Size: M , L , XL Bontrager made of aluminum, 31.8 mm, 15 mm rise, 750 mm width |
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*handles | Size: XS , S , M , L , XL Bontrager XR Endurance Comp |
Size: XS , S , M , L , XL Bontrager XR Endurance Comp, screw clamp |
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*Stem | Size: XS Bontrager alloy, 31.8mm, Blendr compatible, 7 degrees, 50mm length |
Size: S , M Bontrager Alloy, 31.8mm, Blendr Compatible, 7 Degree, 60mm Length |
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Size: L , XL Bontrager Alloy, 31.8mm, Blendr Compatible, 7 Degree, 70mm Length |
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tax rate | FSA IS-2, 1 1/8" top, 1.5" bottom |
brake disc | Tektro, 6-bolt, 203mm |
equipment
battery pack | Bosch PowerTube, vertical, 500Wh |
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charger | Bosch standard charger 2A, 100-240V, Smart System |
controllers | Bosch Purion |
engine | Bosch Performance CX, magnesium motor housing, 250 watts, 85 Nm, assistance up to a maximum of 25 km/h |
Weight
Weight | M – 23.37 kg / 51.53 lbs |
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Max weight | This bike has a maximum weight limit (bike, rider and load) of 136 kg. |
We reserve the right to change the product information provided on this site at any time without notice, including changes in equipment, specifications, models, colours and prices. The prices shown are the manufacturer's recommended retail prices.
Bike and frame weights are based on pre-production painted frames at time of publication. Actual weight may vary.
Article: 22-POWERFLY 4