Bike Comparison
    Powerfly 42021 Trek
    Recommended
    MSRP
    $3,699
    Where to Buy
    —
    $1

    At

    Category
    		Trail, E-Bike
    Weight
    		52.2 lbs
    4.2
    Frame
    		Aluminum
    Fork
    		Suntour XCM
    Wheels
    		Aluminum
    Wheel Size
    		27.5″ / 29″
    Brakes
    		Hydraulic Disc
    Motor
    		Bosch 250W 85Nm mid-drive
    Battery
    		Bosch 500Wh
    Groupset
    		Deore, FSA
    Drivetrain
    		1 × 10
    Suspension
    		Hardtail
    Front Travel
    		120mm
    Brand Site

    trekbikes.com

    Summary
    		The Trek Powerfly 4 is a 27.5″ / 29″ aluminum frame hardtail trail e-bike with upper mid-range components.
    Similar Bikes
    Accessories
    Ride Feel

    Based on frame geometry and build specs.

    Terrain
    easyextreme
    Handling
    nimblestable
    Powerfly 4
    Other Trail bikes
    Gear Range

    A bike with lower gearing will be easier to ride up steep hills, while a higher top end means it will pedal faster down hills.

    Lowest gear

    (climbing)

    28 mph

    Powerfly 4

    Highest gear

    (descending)

    Spec Level

    Based on build material and quality level of the frame, fork, wheelset, groupset, suspension system, and more.

    Geometry
    Specs
    Powerfly 42021 Trek
    Frame

    Alpha Platinum Aluminum, Removable Integrated Battery (RIB), tapered head tube, Control Freak internal routing, Motor Armor, Boost148, 12mm thru axle

    BB Standard: Bosch, Press Fit

    Colors: Lithium Grey / Trek Black; Factory Orange / Lithium Grey; Matte Solid Charcoal / Matte Miami

    Fork

    Size: XS, SR Suntour XCM 34, coil spring, preload, lockout, tapered steerer, 44mm offset, Boost110, 15mm thru axle, 80mm travel; Size: S, M, L, XL, SR Suntour XCM 34, coil spring, preload, lockout, tapered steerer, 44mm offset, Boost110, 15mm thru axle, 120mm travel

    Bottom Bracket

    Bosch, press-fit

    Headset

    FSA IS-2, 1-1/8'' top, 1.5'' bottom

    Stem

    Size: XS, Bontrager alloy, 31.8mm, Blendr compatible, 7 degree, 50mm length; Size: S, M, Bontrager alloy, 31.8mm, Blendr compatible, 7 degree, 60mm length; Size: L, XL, Bontrager alloy, 31.8mm, Blendr compatible, 7 degree, 70mm length

    Handlebar

    Size: XS, S, Bontrager alloy, 31.8mm, 15mm rise, 720mm width; Size: M, L, XL, Bontrager alloy, 31.8mm, 15mm rise, 750mm width

    Saddle

    Bontrager Commuter Comp

    Seatpost

    Size: XS, S, Bontrager alloy, 31.6mm, 12mm offset, 330mm length; Size: M, Bontrager alloy, 31.6mm, 12mm offset, 360mm length; Size: L, XL, Bontrager alloy, 31.6mm, 12mm offset, 400mm length

    Pedals

    VP-536 nylon platform

    Grips

    Bontrager XR Endurance Comp, lock-on

    Groupset
    Rear Derailleur

    Shimano Deore M5120, long cage

    Crank

    FSA Bosch CK-220, 36T ring, 165mm length

    Shifters

    Shimano Deore M4100, 10 speed

    Cassette

    Shimano Deore M4100, 11-46, 10 speed

    Chain

    KMC X10, 10 speed

    Brakes

    Tektro HD-M275 hydraulic disc

    Wheels
    Rims

    Bontrager Connection, double-wall, 32-hole, 20mm width, presta valve

    Spokes

    14g stainless steel

    Front Hub

    Formula DC-511, 6-bolt, Boost110, 15mm thru axle

    Rear Hub

    Bontrager alloy, sealed bearing, alloy axle, 6-bolt, Shimano 8/9/10 freehub, Boost148, 12mm thru axle

    Tires

    Size: XS, S, Bontrager XR3 Comp, wire bead, 30tpi, 27.5x2.35''; Size: M, L, XL, Bontrager XR3 Comp, wire bead, 30tpi, 29x2.30''

    Disc Rotors

    Tektro, 6-bolt, 203mm

    Electric Components
    Motor

    Bosch Performance CX, magnesium motor body, 250 watt, 85 Nm, 20mph or 32km/h max assist

    Battery

    Bosch PowerTube 500

    Charger

    Bosch compact 2A (100-240V) charger

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