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It's right for you if...
You want a super versatile full suspension e-MTB to take out on the trail. You also want it to come equipped with commute-ready accessories so you can bring home the bacon and get a little shreddy on your way back from work.
The tech you get
A durable aluminum frame that fully encases a long-range 625Wh battery, a powerful Bosch Performance CX motor that helps you sustain speeds of up to 20 mph or 32 km/h, and a SmartphoneHub controller that can be used with or without your phone. Plus, a 120mm suspension fork, 100mm of rear travel, powerful 4-piston hydraulic brakes, Bontrager Line Comp 30 wheels, a 12-speed Shimano XT drivetrain, and a dropper post for getting low on descents.
The final word
Our best Powerfly FS rips rough trails, rail trails, and rugged commutes thanks to a plush suspension setup, powerful drive system, and loads of utility features.
See it in action
favorite_borderWhy you'll love it
- It comes equipped with fenders, a rear trunk rack, and lights that are powered by the battery so you're ready to ride right from the start
- Download the COBI.Bike app and your phone becomes an on-board computer. Attach it to SmartphoneHub to charge, make or take calls, listen to music, get turn-by-turn directions, and more
- Wide Line Comp 30 wheels provide more tire support so you get better traction and control
- 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 to remove the battery without tools, and lets you mount a water bottle cage—even on full suspension e-MTBs
- The size S frame features a curved top tube that makes standing over the bike easier. Plus, Smart Wheel Sizing means you'll get the fastest wheel that fits—29˝ wheels on larger frames, 27.5˝ wheels on smaller frames
"Powerfly FS wins Best in Test"
"Powerfly FS blends sporty handling, efficient propulsion and long-distance comfort into a harmonious overall concept. The result: pure riding fun! "
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Features
Bosch Performance Line CX motor
Bosch Performance Line CX sets the standard for eMTB performance with up to 85Nm of torque and an intelligent eMTB mode with Extended Boost that automatically adjusts the amount of assist based on the terrain.
Custom eMTB Lite mode
Trek eMTBs feature a custom eMTB Lite mode in place of Tour mode. It gives you more natural-feeling power delivery and longer battery life.
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.
Adventure-ready accessories
Powerfly Equipped gives you maximum utility thanks to pre-installed accessories. You get a kickstand, front and rear lights, plus fenders and a rear rack custom made for clean integration.
To see how far you can ride your electric mountain bike on a single charge, check out Bosch’s range calculator. We’ve auto-filled the variables for this bike model and the average rider, but you can make adjustments to get your most accurate estimate.
Suspension Calculator
This suspension calculator will help you optimize your suspension settings for your riding weight. Simply follow the steps to find your best set up.
Learn more
Bosch SmartphoneHub Display
The Bosch SmartphoneHub connects your smartphone to the COBI.Bike app via Bluetooth, turning your phone into an on-board computer. You can charge your phone, take calls, listen to music, track your fitness, get directions, and more. Smartphone? More like Smartbike.
Smart Wheel Size
The right wheel size paired with your frame size gives you the perfect combination of responsiveness and control.
Dropper post
Use the remote lever to lower your saddle so it's out of your way when you're descending and cornering.
Integrated speed sensor
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.
How to ride on mountain bike trails
Guidelines and tips for protecting and sharing the trails you ride.
Learn more
5 things to do before every mountain bike ride
Do this quick pre-ride safety check before you hit the trails.
Learn more
How do Bontrager WaveCel helmets work?
Learn more about a major advancement in the protection against cycling-related head injuries.
Learn more
Specifications
*spec applies to all sizes unless otherwise noted
| 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 |
|---|---|
| Fork | SR Suntour Zeron 35, air spring, LO R damper, hydraulic lockout, tapered steerer, 44mm offset, Boost110, 15mm bolt-on thru axle, 120mm travel |
| Shock | RockShox SID Lux Select+, 190 x 45mm |
| Max compatible fork travel | 120mm (XS & S: 520mm axle-to-crown, M & up: 545mm axle-to-crown) |
| Wheel front | Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle |
|---|---|
| *Wheel rear |
Size:
XS , S Bontrager Line Comp 30, Tubeless Ready, Rapid Drive 54, 6-bolt, Boost148, 12mm thru axle |
|
Size:
M , L , XL Bontrager Line Comp 30, Tubeless Ready, Rapid Drive 108, 6-bolt, Boost148, 12mm thru axle |
|
| Skewer rear | Bontrager Switch thru axle, removable lever |
| Rim | Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle |
| *Tire |
Size:
XS , S Bontrager LT4 Expert, reflective strip, wire bead, 60 tpi, 27.5x2.40'' |
|
Size:
M , L , XL Bontrager LT4 Expert, reflective strip, wire bead, 60 tpi, 29x2.40'' |
|
| Rim strip | Bontrager TLR |
| Max tire size | Frame: 29x2.40" (XS & S: 27.5x2.60") Fork: See manufacturer |
| Shifter | Shimano XT M8100, 12 speed |
|---|---|
| Rear derailleur | Shimano XT M8100, long cage |
| Crank | E*thirteen E*spec Plus, 34T, 165mm length |
| Cassette | Shimano XT M8100, 10-51, 12 speed |
| Chain | Shimano Ultegra/XT M8100, 12 speed |
| Max chainring size | Max: 46T, Min 34T |
| Saddle | Bontrager Commuter Comp |
|---|---|
| *Seatpost |
Size:
XS , S , M Bontrager Line Dropper, 100mm travel, internal routing, 31.6mm, 345mm length |
|
Size:
L , XL Bontrager Line Dropper, 150mm travel, internal routing, 31.6mm, 440mm length |
|
| Handlebar | Bontrager alloy, 31.8mm, 15mm rise, 750mm width |
| Grips | Bontrager XR Endurance Comp, lock-on |
| *Stem |
Size:
XS , S Bontrager Elite, 31.8mm, Blendr light mount, 7 degree rise, 60mm length |
|
Size:
M , L , XL Bontrager Elite, 31.8mm, Blendr light mount, 7 degree rise, 70mm length |
|
| Headset | FSA IS-2 |
| Brake | Shimano XT M8120 4-piston hydraulic disc |
| Brake rotor | Shimano RT76, 6-bolt, 203mm |
| Battery | Bosch PowerTube 625 |
|---|---|
| Charger | Bosch standard 4A (100-240V) charger |
| Controller | Bosch SmartphoneHub |
| Motor | Bosch Performance CX, magnesium motor body, 250 watt, 85 Nm, 20mph or 32km/h max assist |
| *Light |
Size:
XS , S , M , L , XL Supernova E3 Mini-2 rear light, LED |
|
Size:
XS , S , M , L , XL Supernova Mini 2, 5-21V LED headlight |
|
| Kickstand | Pletscher Comp Flex 18 |
| Cargo rack | MIK Compatible alloy rear rack |
| *Fender |
Size:
XS , S Trek Powerfly 27.5'' custom fender |
|
Size:
XS , S , M , L , XL Trek Powerfly FS custom fender |
|
|
Size:
M , L , XL Trek Powerfly 29'' custom fender |
| Weight | M - 27.05 kg / 59.64 lbs (with TLR sealant, no tubes) |
|---|---|
| Weight limit | This bike has a maximum total weight limit (combined weight of bicycle, rider, and cargo) of 300 pounds (136 kg). |
Sizing & Tech
The charts below show our recommended sizes based on height, but there are some other factors, like arm and leg length, that determine a great fit. That’s why you’ll see some overlap in our recommendations. Not every rider who’s 5´8˝, for example, will fit on the same size bike. The best way to find your perfect fit is to consult the experts at your local retailer.
Rider Height
Inseam
XS
137.0 - 155.0 cm
4'5.9" - 5'1.0"
64.0 - 73.0 cm
25.2" - 28.7"
S
153.0 - 166.5 cm
5'0.2" - 5'5.6"
72.0 - 79.0 cm
28.3" - 31.1"
M
161.0 - 175.0 cm
5'3.4" - 5'8.9"
76.0 - 82.0 cm
29.9" - 32.3"
L
174.0 - 188.0 cm
5'8.5" - 6'2.0"
82.0 - 88.0 cm
32.3" - 34.6"
XL
186.0 - 196.0 cm
6'1.2" - 6'5.2"
87.0 - 92.0 cm
34.3" - 36.2"
All measurements provided in cm unless otherwise noted.
| Frame size number | Frame size letter | Wheel size | A — Seat tube | B — Seat tube angle | Effective seat tube angle | C — Head tube length | D — Head angle | E — Effective top tube | F — Bottom bracket height | G — Bottom bracket drop | H — Chainstay length | I — Offset | J — Trail | K — Wheelbase | L — Standover | M — Frame reach | N — Frame stack |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 14.5 | XS | 27.5" | 36.8 | 68.3° | 76.0° | 14.0 | 66.5° | 55.4 | 33.2 | 2.4 | 46.8 | 4.4 | 10.7 | 117.0 | 69.1 | 40.5 | 59.9 |
| 15.5 | S | 27.5" | 39.5 | 68.3° | 76.0° | 14.0 | 66.5° | 56.4 | 33.2 | 2.4 | 46.8 | 4.4 | 10.7 | 118.0 | 69.1 | 41.5 | 59.9 |
| 17.5 | M | 29" | 42.0 | 67.5° | 76.0° | 13.0 | 66.5° | 58.9 | 33.5 | 3.9 | 47.0 | 4.4 | 11.4 | 120.6 | 71.2 | 43.0 | 63.7 |
| 19.5 | L | 29" | 45.0 | 67.5° | 76.0° | 14.0 | 66.5° | 62.1 | 33.5 | 3.9 | 47.0 | 4.4 | 11.4 | 124.0 | 71.6 | 46.0 | 64.6 |
| 21.5 | XL | 29" | 50.0 | 67.5° | 76.0° | 14.0 | 66.5° | 64.6 | 33.5 | 3.9 | 47.0 | 4.4 | 11.4 | 126.5 | 71.3 | 48.5 | 64.6 |