Is Trek Powerfly 4 Worth Buying? [Trek Powerfly 4 Review]

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Trek Powerfly 4

  • Price: $3849
  • Category: Cross-country electric bicycle
  • Frame: Aluminum
  • Gear: 1×10
  • Tires: 27.5″ / 29×2.6″

What we like about it: The powerful Bosch motor with Shimano drivetrain gives you the ultimate climbing riding experience. In addition, the Purion controller features a walk assist and intelligent eMTB mode that automatically delivers the right amount of power for your riding terrain.

What we don’t like about it: The motor makes a noise when it starts.

Rating (4.6/5)

Trek Powerfly 4


Every thrill-seeking rider dreams of an intense ride on rugged, winding trails. So when faced with the rolling hills and mountains, we desperately want a bike that performs well enough to make our dreams come true. Fortunately, the Trek Powerfly 4 is such a cost-effective e-bike with both commuting and off-road performance.

First, the rugged aluminum frame gives the Trek Powerfly 4 a more spacious and lighter body. Second, the high-performance Bosch and high-performance CX (250W, 85Nm) motors help you reach speeds of up to 20 mph. Finally, the Bontrager XR3 is equipped with 29″ wide tires that give you the confidence to maintain strong traction even on gravel-strewn sandy trails.

We have been reviewing the Trek Powerfly 4 for two months, and to make the results more informative for you, we’ll elaborate on the Trek Powerfly 4’s performance while riding, key features, components and specifications, and other versions in the series. If you’d like to learn more about the versions, please refer to our review.

Trek Powerfly 4 General Riding

The versatile Trek Powerfly 4 is a very cost-effective choice. It’s not a vehicle for off-road riders and is a smart choice if you use it for commuting to work.

When I rode the Trek Powerfly 4 for five miles on my commute, it still performed well. The 71.5° seat tube angle is not as steep as previous mountain bikes, instead, it fits my seating position better and gives me a comfortable riding experience.

The 29″ Bontrager XR3 is a natural for the second half of my brick road! Its protruding aramid beads cling to the ground like powerful suction cups, turning fast while maintaining the ultimate in smoothness. Of course, 29″ tires aren’t the only option, as Trek has given the Trek Powerfly 4 more tire options. If you want more responsive steering, then I’m sure the 27.5″ size is the best choice for you.

I didn’t feel my pedaling struggle as much as I used to when passing up the inclined uphill grade of about 5%. I think that’s what I felt most about the Bosch Performance CX, as the torque of 85Nm easily allowed me to overcome the steep climb.

At the same time, with the quick-action Shimano Deore M4100, 1×10-Speed drivetrain, it was easy enough to adjust the speed so that I still had enough energy for an easy ride even in the last kilometer of the sprint. Of course, I wouldn’t mind a 12-Speed gearing for the next version of the Trek Powerfly 4, after all, more and wider speed options would make for a more interesting riding experience.

Trek Powerfly 4 Trail Riding

Of course, as the main battleground of the off-road surface, Trek Powerfly 4 still surprises people with its performance. At the weekend Jack and I went to the famous Stromlo Forest Park to challenge the 40km of mountain trail running.

We were also a bit worried when faced with rocky forest gravel trails and rugged and changing mountain passes. Still, the Trek Powerfly 4 showed no signs of trepidation. To be honest, I was worried that the overly bumpy ride would leave me physically sore and numb, which is something no one wants to endure. But apparently, the SR Suntour XCM 34 fork does this very well, with 120mm of travel to offset more of the impact. Also, the quality VP Components, VP-536 Nylon Pedal didn’t put too much drag on my ride, and there’s nothing like that to get the ride off to a great start.


When I rode onto wet and muddy grass trails, I was concerned that going too fast would introduce a certain amount of instability. But apparently, the Trek Powerfly 4 took this into account early on. the Purion controller features a walk assist and an intelligent eMTB mode that automatically delivers the right amount of power for my terrain. This allows me to always ride at a smooth speed.

Of course, it’s worth mentioning the amazing gear shifting of the Shimano Deore M4100’s 10-Speed drivetrain. When I made an ascending sprint, the gear selection was made almost instantly. I gained a faster ride by locking into the SR Suntour XCM 34, putting me well ahead of Jack.

Not only that, the Tektro HD-M275 Hydraulic Brake was still able to perform strong and stable emergency braking in the face of slippery muddy roads. This, combined with the rough tread of the Bontrager XR3’s prominent surface, provided enough safety and confidence for my ride.

Main Features


Trek Powerfly 4

You may not imagine that Jack exclaimed “Wow, unbelievable!” when he first saw the wild Trek Powerfly 4, whose unparalleled bodywork conquered everyone in the audience.

First and foremost, the rugged and refined alpha aluminum alloy brings great ductility to the Trek Powerfly 4. Through continuous cold extrusion and butting at multiple points, it is hydraulically formed into complex tubes to achieve a strong surface and minimal body weight.

Secondly, the internal cable setup not only keeps the cables in a safe location but also allows you to reduce maintenance. This also gives the Trek Powerfly 4 a longer life while reducing your cleanup and maintenance costs. You don’t have to worry about damage to the motor from off-road bumps. Finally, the unique motor is strong and durable, keeping the material light while providing you with the safest protection for your ride.

Of course, you can also choose whether you want to install fenders and rear brackets according to your wishes.


No matter what type of bike you’re on, scientifically thoughtful geometry always leads to a more comfortable and efficient ride, and the Trek Powerfly 4 is no exception.

The 71.5° seat tube angle isn’t a steep presence, and it’s better suited for novices to conquer those not-so-steep uphill surfaces. At the same time, the Trek Powerfly 4 is set up with a shorter and smaller wheelbase length to offset the unresponsiveness of the big and wide Bontrager XR3 in terms of steering. The benefit of this is also that you can maintain a smooth turn even in the face of those thrilling roads with sharp turns.

One more thing, the not-so-steep head tube angle (65.0°) has a crucial impact on your short-track descents. At the same time, the 11.4mm trail provides you with a good riding experience, and you can ride freely on winding roads.

That’s right, comfortable and snug geometry will always support your ride in every way.

Components and Specifications

Shimano Deore M4100, 10-speed Drivetrain

Trek Powerfly 4 Shimano Deore M4100, 10-speed Drivetrain

The Shimano Deore M4100, 10-Speed drivetrain has absolute performance, and you only need to flick the right-hand tab for a butter-smooth shift.

The crank technology of FSA Bosch CK-220 enables you to accelerate easily even on some ascending sections with about 5% grade. And it allows you to shift effectively in the face of different riding situations. So you have to admit that Shimano is one of the best drivetrain manufacturers.

But as I mentioned above, I believe the Trek Powerfly 4 would have sold better if the 10-Speed drivetrain had been replaced with a 12-Speed operating system.

Bontrager XR3 Tires

Trek Powerfly 4 ontrager XR3 Tires

The Bontrager XR3 gave me the answer as to what kind of tire can handle the gravel and dead branch spreading single-track trails. The 29”x2.6” tire size is extremely stable, and its prominent tread pattern gives me a smooth ride even when you’re dealing with wet and flat mossy roads. Also as a regular XC racer, the Bontrager XR3 can increase traction and comfort while reducing pressure when riding on off-road tracks. What’s more, the special anti-puncture system eliminates the risk of flat tires, eliminating your worries. Of course, Trek also offers a 30-day unconditional refund, so if you’re not satisfied with it, you can visit your local store for an exchange or refund.

Tektro HD-M275 Hydraulic Brake

Can you live with a bike that doesn’t have enough braking power? I can tell you without hesitation that I would say “No” to such brakes. Without a good brake, your ride will be a huge safety hazard. But the Tektro HD-M275 Hydraulic Brake doesn’t give you that concern.

In addition, the open system makes it easier to clean and maintain, while the dual-piston braking device has plenty of confidence in braking. At the same time, to eliminate the noise caused by brake friction, Trek has thoughtfully applied low-noise resin pads on the bottom for a better riding experience.

SR Suntour XCM 34 Fork

Trek Powerfly 4 SR Suntour XCM 34 Fork

I believe the SR Suntour XCM 34 fork is the result of Trek’s careful consideration. The fork suspension it comes with is very resilient and will not be damaged by overly bumpy roads. And yes, it’s sturdy. After two months of riding on gravel and sand, it still performed as well as new.

One might complain that 120mm of travel for mountain trail riding would not have an impact on the performance of the shock. The fact is it performs very well. The streamlined, superior structural configuration works by retracting up and down to counteract the feeling of more vibration as it moves forward. Give it a try, I’m sure even veteran XC race riders will rave about the SR Suntour XCM 34 fork.

Bosch PowerTube 500Wh Battery and Motor

Trek Powerfly 4 Bosch PowerTube 500Wh Battery and Motor

As we all know, in an electric vehicle, the motor is the soul. the PowerTube 500 stands out with its black, high-grade anodized aluminum finish. In addition, the Bosch high-performance CX motor sets the standard for eMTB performance. Meanwhile, torque is up to 85Nm, and the intelligent eMTB mode fuels body-extending performance that automatically adjusts to the terrain. What’s more, the RIB as an all-in-one battery has a built-in handle design that can be easily removed and reinstalled in the frame without tools. After our measurement, it can provide a maximum speed of 20mph, which is the most powerful assistant in your race.

Other versions of Trek Powerfly

Trek Powerfly 5

To give you more options, we tested the other Trek Powerfly 4 models in an objective and unbiased manner, including the Trek Powerfly 5 for a certain amount of time.

Also made of alpha aluminum alloy, Trek Powerfly 5 has a much lighter body condition. This is certainly good news for those who seek a lighter body.

The Trek Powerfly 5 is a higher-end RockShox Recon Silver RL, but with the same 120mm travel, it has a better damping experience.

Meanwhile, the Shimano XT M8100 1×12-Speed drivetrain makes up for the regret I had with the Trek Powerfly 4. Because it has a more lush gear ratio and a wider range of speed adjustments, it provides a more interesting riding experience.

If you’re like me and have an inexplicable obsession and love for 12-Speed drivetrains, then I think the Trek Powerfly 5 will fit the bill. But it also means you’ll have to spend more $$$, which may be a bit of a hit to your wallet.


  • What is the price of the Trek Powerfly 4?

The Trek Powerfly 4 is priced at $3849.99.

  • What is the body material of the Trek Powerfly 4?

The body of Trek Powerfly 4 is made of Alfa aluminum alloy.

  • What is the tire size of the Trek Powerfly 4?

The Trek Powerfly 4 tire size is 29 “x2.6”

  • What is the maximum weight limit for the Trek Powerfly 4?

The Trek Powerfly 4 has a maximum weight limit of 300 lbs.

  • How was the size of the Trek Powerfly 4 chosen?
Size Rider Height
Xs 137 – 155 cm/4’6″ – 5’1″
153 – 167 cm/5’0″ – 5’6″
161 – 175 cm/5’3″ – 5’9″
174 – 188 cm/5’9″ – 6’2″
Xl 186 – 196 cm/6’1″ – 6’5″

Trek Powerfly 4 Specs

Frame Alpha Platinum Aluminum, Removable Integrated Battery (RIB), tapered head tube, Control Freak internal routing, Motor Armor, Boost148, 12mm thru-axle
Fork Size: S, M, L, XL, SR Suntour XCM 34, coil spring, preload, lockout, tapered steerer, 44mm offset, Boost110, 15mm thru-axle, 120mm trave
Hub front Formula DC-511, 6-bolt, Boost110, 15mm thru-axle
Hub rear Bontrager Approved DC-3248, sealed bearing, alloy axle, 6-bolt, Shimano 8/9/10 freehub, Boost148, 12mm thru-axle
Skewer rear Bontrager Switch thru-axle, removable lever
Rim Bontrager Connection, double-wall, 32-hole, 20mm width, Presta valve
Spokes 14g stainless steel
*Tire Size: XS, S, Bontrager XR3 Comp, wire bead, 30tpi, 27.5×2.35”
Size: M, L, XL, /, /, /, 29×2.30”
Max tire size Frame: 29×2.60″ or 27.5×2.8″ (XS & S: 27.5×2.60″) Fork: See manufacturer
Shifter Shimano Deore M4100, 10 speed
Rear Derailleur Shimano Deore M5120, long cage
Crank FSA Bosch CK-220, 36T ring, 165mm length
Cassette Shimano Deore M4100, 11-46, 10 speed
Chain KMC X10, 10 speed
Saddle Bontrager Commuter Comp
*Seatpost Size: XS, S, Bontrager alloy, 31.6mm, 12mm offset, 330mm length
Size: M, /, /, /, 360mm length
Size: L, XL, /, /, /, 400mm length
*Handlebar Size: XS, S, Bontrager alloy, 31.8mm, 15mm rise, 720mm width
Size: M, L, XL, /, /, /, 750mm width
Grips Bontrager XR Endurance Comp, lock-on
*Stem Size: XS, Bontrager alloy, 31.8mm, Blendr compatible, 7°, 50mm length
Size: S, M, /, 31.8mm, Blendr compatible, 7°, 60mm length
Size: L, XL, /, 31.8mm, Blendr compatible, 7°, 70mm length
Headset FSA IS-2, 1-1/8” top, 1.5” bottom
Brake rotor Tektro, 6-bolt, 203mm
Brake Set Tektro HD-M275 hydraulic disc
Battery Bosch PowerTube 500Wh
Charger Bosch compact 2A, 100-240V, smart system
Controller Bosch Purion
Motor Bosch Performance CX, magnesium motor body, 250 watts, 85 Nm, 20mph or 32km/h max assist
Weight M – 23.37 kg / 51.53 lbs


What we like about it

  1. The user-friendly Removable Integrated Battery (RIB) allows you to easily remove the battery.
  2. Versatile Bosch system for your commuting and backcountry climbing needs
  3. The Alfa aluminum body frame is tough enough to provide a comfortable riding experience.
  4. Bontrager XR3 has a hard shell that crushes all debris obstacles.
  5. Purion controllers feature walk-assist and intelligent eMTB modes that automatically deliver the right amount of power for your terrain.

What we don’t like about it

  1. Some people might complain that the motor generates noise when it’s in motion.
  2. The 120mm travel cannot adapt to the more complex and variable bumpy roads.
  3. Rarer color options.

Comparison Table

Bicycles Price Drivetrain Tires Click view
Bulls Aminga EVA 2 27.5” Diamond $3499 SHIMANO Deore 11-speed  27.5’x2.35” Click view
Scott Aspect eRIDE 920 $3999 SRAM NX Eagle / 12 Speed 29×2.6″  Click view
Rocky Mountain Growler Powerplay 30 $4199  Shimano Deore 12spd 27.5x 2.8″ Click view
Giant Stance E+ 2 $4400 Shimano Deore, 10-speed  29×2.4″ Click view

Trek Powerfly 4 vs Bulls Aminga EVA 2 27.5” Diamond

Bulls Aminga EVA 2 27.5'' Diamond

Bulls Aminga and Trek Powerfly 4 are also used as electric bikes, both of them are made of Alfa aluminum, which makes the body strong and tough enough.

But the difference is that Bulls Aminga pays more attention to the ride on bumpy roads, as it also pays extra attention to the choice of a fork. The Suntour XCR 32 Air is made of higher-quality materials and is lighter in weight. Even in the face of rolling hills and forests, it can mitigate damage to the rider’s body through high-speed movement.

However, it should also be noted that the Trek Powerfly 4 has more options in terms of tires (27.5”/29”). The Bulls Aminga is a bit inferior at this point, with only 27.5″ tires available. This is not good news for riders who are used to big tires all year round.

If you have a preference for larger tires, then I believe the Trek Powerfly 4 is still the best choice for you.

Trek Powerfly 4 vs Scott Aspect eRIDE 920

Scott Aspect eRIDE 920

With the same weight (both measured at 23.4kg), the Scott Aspect eRIDE 920 brings the 12-Speed system I mentioned. The choice of Groupset is also based on the higher quality NX Eagle, SX Eagle, and a wide range of speed control systems to provide a more interesting riding experience.

Not only that, the PowerTube has a more advanced battery option, with 625wh of battery power to provide a longer, faster ride. But unfortunately, the Scott Aspect eRIDE 920 still doesn’t have the same freedom to choose the tire size as the Trek Powerfly 4. This is again similar to the Bulls Aminga we mentioned above.

In addition, if you don’t like your battery exposed, the Trek Powerfly 4 may appeal to you. This Trek Powerfly 4 not only protects with the battery completely hidden in the frame but it can also be easily removed.

Notably, it comes with Purion controller with a walk assist and intelligent eMTB mode that automatically delivers the right amount of power for your terrain.

I have to say that Trek Powerfly 4 has a great price/performance ratio, both in price and in performance configuration, and is a good choice.

Learn more : Is The Scott Scale 940 A Great Value Hardtail Bike? [Scott Scale 940 Review]

Trek Powerfly 4 VS Rocky Mountain Growler Powerplay 30

Rocky Mountain Growler Powerplay 30

The Rocky Mountain Growler Powerplay 30 is, in my opinion, a swift bull. It can brave the endless gravel land. In addition, the 634wh fully integrated lithium-electric battery gives it the ability to go crazy in XC races. In this respect, the Trek Powerfly 4’s 500wh battery may be a bit inferior.

Also, the Suntour XCR 34 fork has a slightly longer travel of 130mm than the Trek Powerfly 4. This also provides more cushioning to eliminate most of the ground vibrations. It also has a dropper design on the bottom saddle, which is a big competitive advantage for an e-bike of its type. The double protection can give you the ultimate riding experience.

The Trek Powerfly 4’s removable battery, however, is a highlight for many riders who prefer a clean charge. And the Trek Powerfly 4’s fork with a locking feature also prevents you from losing kinetic energy while riding on flat roads due to the work of the shock and thus slowing down your speed.

If you’re aiming for gravel-strewn forest roads with rugged rock walls, the Rocky Mountain Growler Powerplay 30 may give you the courage to sprint. But if you’re on a budget or want a simple, comfortable ride, I’d recommend the Trek Powerfly 4.

Trek Powerfly 4 vs Giant Stance E+ 2

Giant Stance E+ 2

The Giant Stance E+ 2 is the top end of the Giant line with unmatched advantages. It has a sturdy body as well as a strong surface, which is hydraulically formed into an exclusive tube body through a specific technology to achieve the perfect combination of weight and body. Unlike the hardtail vehicles of the Trek Powerfly 4, the full-suspension Giant Stance E+ 2 offers the ultimate damping experience with its front and rear travel (130mm front and 120mm rear). But if there’s anything that one laments, it would be the 500-watt-hour battery. It is very heavy and makes a lot of noise when it is started. If you’re looking for a full-suspension off-road e-bike, then the Giant Stance E+ 2 is the bike for you.

Although the Trek Powerfly 4 only has a dampened fork, this may not be as good as the Giant Stance E+ 2 when facing relatively harsh and bumpy terrain. But I think that’s forgivable – after all, the Trek Powerfly 4 doesn’t have a rear shock. And in real-world climbing, the Trek Powerfly 4 performs better. The relatively lighter body also saves weight on upward climbs.

If you prefer more challenging upward climbing routes, or if you prefer the more expensive Giant Stance E+ 2, the Trek Powerfly 4 is a great choice for the price.

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learn more:Giant Stance Review – Finding The Joy Of Riding In A Rapid Descent

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