Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
Trek
2021 Trek Powerfly 4
Previous used estimate
$1,578 - $1,623
Actual value depends on condition, size, and local demand.
Value Guide market data · 2021 Trek Powerfly 4
12-month projected trend
12%
Direction and magnitude, not judgment
vs. category average
1%
Drops faster than category avg
Price over time - 2021 Trek Powerfly 4
Values based on actual sales data. Enter your bike's specifics to get a precise valuation.
All Powerfly model years
Overview
About this bike
Powerfly 4 is our most affordable electric mountain bike. It's built with parts that hold up, like a smooth-shifting Shimano drivetrain, and a powerful Bosch motor. Plus, it features our user-friendly Removable Integrated Battery (RIB) system that's fully encased in the frame yet doesn't require tools for removal. This bike expands your boundaries and lets you travel to destinations you never thought you'd reach on a mountain bike. It's right for you if... You're sold on the e-bike revolution and want the capability and versatility of a mountain bike at a price that doesn't resemble the car you're trying to use less. You want bigger, better off-road adventures, and know an e-MTB with the latest user-friendly tech is the best way to get them. The tech you get A tough yet refined aluminum frame that fully encases a long-range 500Wh battery for sleek looks, a Bosch Performance CX (250W, 75Nm) motor that assists up to 20 mph or 32 km/h, a Bosch Purion controller, a 1x10 Shimano drivetrain, an 80mm SR Suntour fork with lockout, and hydraulic disc brakes. Plus, Smart Wheel Sizing means riders of every size get a great fit—29" wheels on larger frames, 27.5" wheels on smaller frames. The final word Our most affordable electric mountain bike comes with the same powerful Bosch motor and intuitive controller as our most expensive e-bikes, with a smaller battery and parts chosen to give you great value. Why you'll love it - Trek's Removable Integrated Battery (RIB) system looks great and is super user-friendly: it fully hides the battery in the frame for protection, makes it easy remove the battery without tools and lets you mount a water bottle cage - This bike expands boundaries: the top-notch Bosch system is equally suited to commuting, recreation, and a ridiculously fun time on the trails - The Purion controller has Walk Assist and an intelligent eMTB mode that automatically delivers the right amount of power based on your terrain - It's equipped with an external charging port for easy charging on or off the bike - You can boost your Powerfly’s utility by adding a rack and fenders, plus built-in wiring lets you easily install lights powered by the motor Wheel size: - Sizes X-Small – Small: 27.5-inch - Sizes Medium – X-Large: 29-inch
Specifications
- Subtype
- Electric Mountain
- Category
- E-Bike
- Component Fork
- SR Suntour XCM 34, coil spring, preload, lockout, tapered steerer, 44mm offset
- Component Hubs
- Front: Formula DC-511, 6-bolt, Boost110 Rear: Bontrager Approved DC-3248, sealed bearing, alloy axle, 6-bolt, Shimano 8/9/10 freehub, Boost148
- Component Size
- X-Small, Small, Medium, Large, X-Large
- Component Stem
- Bontrager alloy, 31.8mm, Blendr compatible, 7 degree
- Product Family
- Powerfly
- Component Axles
- Front: 12mm thru axle Rear: 15mm thru axle
- Component Chain
- KMC X10, 10 speed
- Component Color
- Factory Orange/Lithium Grey
- Component Frame
- Alpha Platinum Aluminum, Removable Integrated Battery (RIB), tapered head tube, Control Freak internal routing, Motor Armor, Boost148
- Component Motor
- Bosch Performance CX, magnesium motor body, 250 watt, 75 Nm
- Component Brakes
- Tektro HD-M275 hydraulic disc w/Tektro, 203mm, 6-bolt rotors
- Component Pedals
- VP-536 nylon platform
- Component Saddle
- Bontrager Commuter Comp
- Component Spokes
- 14g, stainless steel, black
- Component Battery
- Bosch PowerTube 500Wh
- Component Charger
- Bosch compact 2A, 100-240V
- Component Display
- Bosch Purion Controller
- Component Headset
- FSA IS-2, 1-1/8" top, 1.5" bottom
- Component Cassette
- Shimano Deore M4100, 11-46, 10 speed
- Component Crankset
- FSA Bosch CK-220, 165mm length
- Component Shifters
- Shimano Deore M4100, 10 speed
- Component Handlebar
- Bontrager alloy, 31.8mm, 15mm rise
- Component Rear Tire
- Size XS, S: Bontrager XR3 Comp, wire bead, 30tpi, 27.5" x 2.35 Size M, L, XL: Bontrager XR3 Comp, wire bead, 30tpi, 29" x 2.30
- Component Seat Post
- Bontrager alloy, 31.6mm, 12mm offset
- Component Chainrings
- 36T
- Component Front Tire
- Size XS, S: Bontrager XR3 Comp, wire bead, 30tpi, 27.5" x 2.35 Size M, L, XL: Bontrager XR3 Comp, wire bead, 30tpi, 29" x 2.30
- Component Tape Grips
- Bontrager XR Endurance Comp, lock-on
- Component Wheel Size
- 27.5-inch, 29-inch
- Component Rims Wheels
- Bontrager Connection, double-wall, 32-hole, 20mm width, presta valve
- Component Rear Derailleur
- Shimano Deore M5120, long cage
- Component Max Assisted Speed
- 20mph or 32km/h max assist
- Hubs
- Front: Formula DC-511, 6-bolt, Boost110 Rear: Bontrager Approved DC-3248, sealed bearing, alloy axle, 6-bolt, Shimano 8/9/10 freehub, Boost148
- Crankset
- FSA Bosch CK-220, 165mm length
- Pedals
- VP-536 nylon platform
- Chain
- KMC X10, 10 speed
- Saddle
- Bontrager Commuter Comp
- Handlebar
- Bontrager alloy, 31.8mm, 15mm rise
- Headset
- FSA IS-2, 1-1/8" top, 1.5" bottom
- Rear Derailleur
- Shimano Deore M5120, long cage
- Rear Tire
- Size XS, S: Bontrager XR3 Comp, wire bead, 30tpi, 27.5" x 2.35 Size M, L, XL: Bontrager XR3 Comp, wire bead, 30tpi, 29" x 2.30
- Stem
- Bontrager alloy, 31.8mm, Blendr compatible, 7 degree
- Axles
- Front: 12mm thru axle Rear: 15mm thru axle
- Brakes
- Tektro HD-M275 hydraulic disc w/Tektro, 203mm, 6-bolt rotors
- Cassette
- Shimano Deore M4100, 11-46, 10 speed
- Chainrings
- 36T
- Display
- Bosch Purion Controller
- Fork
- SR Suntour XCM 34, coil spring, preload, lockout, tapered steerer, 44mm offset
- Frame
- Alpha Platinum Aluminum, Removable Integrated Battery (RIB), tapered head tube, Control Freak internal routing, Motor Armor, Boost148
- Seat Post
- Bontrager alloy, 31.6mm, 12mm offset
- Shifters
- Shimano Deore M4100, 10 speed
- Tape/Grips
- Bontrager XR Endurance Comp, lock-on
- Motor
- Bosch Performance CX, magnesium motor body, 250 watt, 75 Nm
- Max Assisted Speed
- 20mph or 32km/h max assist
- Charger
- Bosch compact 2A, 100-240V
- Battery
- Bosch PowerTube 500Wh
- Color
- Factory Orange/Lithium Grey
- Size
- X-Large
- Wheel Size
- 29-inch
- Spokes
- 14g, stainless steel, black
- Rims/Wheels
- Bontrager Connection, double-wall, 32-hole, 20mm width, presta valve
- Front Tire
- Size XS, S: Bontrager XR3 Comp, wire bead, 30tpi, 27.5" x 2.35 Size M, L, XL: Bontrager XR3 Comp, wire bead, 30tpi, 29" x 2.30
What to check when buying used
Inspection
Drivetrain wear
Check chain stretch, cassette teeth, chainrings, and shifting under load before negotiating price.
Inspection
Service history
Ask for service records covering bearings, brakes, drivetrain, and any frame or fork warranty work.
Inspection
Battery health
Request battery cycle count, capacity diagnostics, and motor service records.