2021 Trek
Powerfly FS 4
A 27.5″ / 29″ aluminum frame full suspension crosscountry e-bike with upper mid-range components.
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Manufacturer Price
$4,599| Weight | 54.9 lbs |
|---|---|
| Frame | Aluminum |
| Suspension | Full, 100 / 120mm |
| Fork | Suntour XCR Air |
| Shock | Suntour |
| Wheels | 27.5″ / 29″ Aluminum |
| Drivetrain | 1 × 10 |
| Groupset | Deore, FSA |
| Motor | Bosch 250W 85Nm mid-drive |
| Battery | Bosch 500Wh |
| Brakes | Hydraulic Disc |
| Seatpost | Dropper |
For This Bike
Based on build material and quality level of the frame, fork, wheelset, groupset, suspension system, and more.
Compare the full Powerfly model range
View Comparison4'5" – 5'2"
5'0" – 5'6"
5'3" – 5'10"
5'8" – 6'3"
6'1" – 6'6"
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Do you have this bike? Help other riders make a decision about which size will work for them by sharing your own size and fit notes.
Sep 2022 · Mike Hunger
We have tested the Trek Powerfly FS 9 Equipped with Bosch Performance Line CX motor and 625 Wh battery for you.
Wide range of applications
Sporty and stylish look
Intuitive handling
Bosch SmartphoneHub ensures good connectivity
None
Feb 2022 · Russell Burton
A well-specified, comfortable and versatile ebike, but at a serious price
Comfort
Range
Stability
Expensive, especially if you’re considering leaving it outside the local shop
Jan 2021 · Susanne Feddersen
One bike for all occasions – with the Trek Powerfly FS 7, the American brand promises to have created a true all-rounder. The smart concept should please everyone from trekking and leisure riders to moderate trail adventurers. We tested the 120/100 mm travel eMTB with the Bosch Performance Line CX motor to find out whether the new Trek Powerfly FS 7 is the all-rounder that many have been looking for.
All-round capabilities
Overall concept
Good-natured and intuitive handling
Confidence-inspiring
Comfortable riding position and low top tube
Responsiveness of the fork is mediocre
No model featuring the Nyon display
Oct 2020
Price: $5999.00 | Model Year: 2021 | A premium
A premium "do anything" full suspension electric bike that's equipped to handle pavement, trails, light mountain terrain, rain, shine, day, or night conditions. Available in five frame sizes for optimal fit, the XS and S come with 27.5" wheels and the M, L, and XL come with 29" wheels. Sold through one of North America's largest network of dealers. Trek and Bosch provide excellent support and warranty.
Custom made extra-wide plastic fenders are durable and quiet, very capable in off-road conditions. A sleek and sturdy rear rack provides 25kg (55lbs) of cargo capacity with pannier hangers on both sides and a removable top platform for trunk bags. Puncture resistant tires also feature unique black reflective stripes that combine safety with aesthetics.
Downtube-integrated battery pack and mid-drive motor keep weight low and center. Trek designed a "RIB" battery casing includes a handle for safe removal and transport. The battery doesn't rattle, and it can be charged on or off the bike with the fast 4 amp charger. Peformance Line CX motor is the most powerful from Bosch, but lightweight with a magnesium casing.
Highly adjustable air suspension front and rear with 120mm and 100mm travel respectively. Boost hub spacing and thru-axles increase wheel strength. Extra large 203mm hydraulic disc brakes with heat sinks and alloy cores deliver incredible stopping power. The biggest trade-offs here include the high price, smartphone display (that some may not like), louder motor operation, and increased weight (due to the high capacity battery and accessories).
Sep 2020
The 2021 Trek Powerfly full suspension e-MTBs blend European sensibility with modern trail capability for a unique e-mountain bike option.
Jan 2019
If I had to think of one common theme that continually came up during our time with the Powerfly, that would be it—too damn fun. Over the months we’ve had this bike, we’ve done it all and it does it all with ease.
Oct 2018 · Alan Muldoon
Up hill or down, ebikes take an absolute beating, so the new Trek Powerfly 9 has a beefed up the parts package to handle the additional abuse.
Suspension, brakes and tyres are all on point. New battery layout is neat and easy to use.
Could have more generous reach measurements and shorter stems on all sizes.
Feb 2018
Built on the bones of the legendary Fuel series, the Trek Powerfly 7 FS is the top-of-the-line e-bike for Trek in Australia. It's got great pedigree, but we didn't love every aspect of its performance
Top notch build quality.
Frame feels indestructible.
Great rear suspension.
Torquey motor with plenty of range.
Will climb anything you point it at.
RockShox Recon fork isn't up to scratch.
Long rear end makes for sedate feel.
| Frame | Alpha Platinum Aluminum, Removable Integrated Battery (RIB), tapered head tube, internal routing, Motor Armor, magnesium rocker link, rack and fender mount, ABP, Boost148, 100mm travel BB Standard: Bosch, Press Fit Tire Clearance: 2.4" Colors: Matte Gunmetal / Matte Black; Purple Flip / Trek Black |
|---|---|
| Fork | Size: XS, S, SR Suntour XCR 34, air spring, LO R damper, hydraulic lockout, tapered steerer, 41mm offset, oversized crown for eMTB, Boost110, 15mm bolt-on thru axle, 100mm travel; Size: M, L, XL, SR Suntour XCR 34, air spring, LO R damper, hydraulic lockout, tapered steerer, 44mm offset, oversized crown for eMTB, Boost110, 15mm bolt-on thru axle, 120mm travel Travel: 120mm Spring Type: Air |
| Shock | SR Suntour Edge R, 190mm x 45mm Travel: 100mm Spring Type: Air |
| Bottom Bracket | Bosch, press-fit |
| Stem | Size: XS, S, Bontrager alloy, 31.8mm, Blendr compatible, 7 degree, 60mm length; Size: M, L, XL, Bontrager alloy, 31.8mm, Blendr compatible, 7 degree, 70mm length |
| Handlebar | Bontrager alloy, 31.8mm, 15mm rise, 720mm width |
| Saddle | Bontrager Arvada, steel rails, 138mm width |
| Seatpost | Size: XS, S, M, TranzX JD-YSP18, 100mm travel, internal routing, 31.6mm, 361mm length; Size: L, XL, TranzX JD-YSP18, 130mm travel, internal routing, 31.6mm, 425mm length Type: Dropper |
| Pedals | VP-536 nylon platform |
| Grips | Bontrager XR Trail Comp, nylon lock-on |
| 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 Type: Hydraulic Disc |
| Rims | Alex MD35, tubeless compatible, 32-hole, 35mm width, presta valve |
|---|---|
| Spokes | 14g stainless steel |
| Front Hub | Bontrager sealed bearing, alloy axle, 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 |
| Motor | Bosch Performance CX, magnesium motor body, 250 watt, 85 Nm, 20mph or 32km/h max assist |
|---|---|
| Battery | Bosch PowerTube 500 Recycling Program: ♻️ Call2Recycle |
| Charger | Bosch compact 2A (100-240V) charger |
Last updated April 16
Not listed for 1,121 days