Trek Powerfly 4

IMG_0976
Written by Robb Dorr
Co-founder, Cycling Enthusiast

Ratings

4/5
4
4.5/5
4.5
4/5
4
4/5
4
4/5
4

More About the Trek Powerfly 4

Year
2022
Type of Bike
Types of Riders
Images from manufacturer's website

35 mi

RANGE

20 mph

TOP SPEED

8 hrs

CHARGE TIME

51.5 lbs

WEIGHT

Mid-drive

MOTOR TYPE

The Takeaway

The Trek Powerfly 4 is the cheapest electric mountain bike made by the brand. This doesn’t take away from its great components and rideability, though. It’s an eMTB designed for track and trail with its larger wheels that smooth out the bumps on rough tracks. Relatively light yet powerful, the Trek Powerfly 4 is an ideal first electric mountain bike that you might use as a car replacement without spending as much as you would on a used car.

 

Ideal for

Non-competition cross-country riding
Light downhill/singletrack riding
Commuter/utility biking
RV holidays
Longer rides where you have a spare battery in your pack

Product Overview

The Bosch Performance CX motor gives a real kick with up to 85Nm of torque, meaning that you can pull away on a steep and muddy hill with confidence. Power delivery is smooth so you won’t spin the rear wheel should you push too hard.

Though the charger is very slow — offering a full charge in around eight hours — the battery is easily swappable, which can mean you can bring a spare in your backpack for a quick switch mid-ride.

One thing that Trek does with this electric bike is fit different equipment to different-sized machines. For example, on the XS and S framed machines, it has a 27.5” wheel size, while on the M, L, and XL sizes have a 29″ wheel.

You can even modify this machine for touring or commuting by adding mudguards, panniers, and wiring in lights, as the power loom has space for these, too.

Reasons to Buy

If you want an electric bike but don’t want to empty your bank account, the Trek Powerfly 4 is a very good machine to consider. At the lower end of the premium spectrum, the Trek Powerfly 4 will be worth every penny when it comes to an electric bike that will look after you on the road or trail.

Designed not to embarrass you on the trail, it works well on longer cross-country rides. Its battery will be good for a 35-mile ride on tougher terrain, and the power of the Bosch Performance CX motor will leave you breaking a sweat only if you’re going easy on the battery.

When it comes to speed control, the electric bike won’t let you down even on steep tracks in wet conditions with its Tektro hydraulic brakes, and on 203mm rotors, they won’t fade even if used a lot.

Things to Consider

If you want a genuinely cheap electric mountain bike, there are others like the Rad Power brand of electric bikes that are more affordable. Trek isn’t the cheapest by any means, but it is economical, light, and powerful compared to the lower end of the market.

Specs

Motor
Mid-drive Bosch Performance CX, 250W
Battery
Bosch PwerTube 500Wh
Gears
10-speed Shimano Deore M4100
Rear cassette
11-46T
Brakes
Tektro HD-M275 hydraulic on 203mm front and rear rotors
Wheel size
29" on larger frames, 27.5" on smaller
Fork
SR Suntour 120mm travel on all except extra small (XS) frame - XS has 80mm travel

The specs above come from the manufacturer and may vary from what you’ve experienced. Notice something that needs correcting? Let us know.

Ratings

Power
4/5
4

Offering up to 85 Nm of torque, the light but punchy Bosch Performance CX motor delivers the power you need for riding off-road, including rapid direction changes and tackling steep climbs as you journey around the woods or mountain.

Its Bontrager XR3 Comp tires won’t go quickly on hard, flat surfaces due to higher rolling resistance, but this isn’t what the Powerfly 4 is about — it’s about fun in the mud and on loose surfaces. As such, the motor won’t achieve great flat-out speeds, but it’ll more than make up for it in raw power over the rough stuff.

Range
4.5/5
4.5

The 500 Wh battery on the Powerfly 4 will give you a good day out on singletrack and a reasonably long day in the saddle on an off-road adventure. However, there’s no option for a range extender, so if you’re looking for more than 35 miles per charge, choose an eMTB with a range extender or a 625+ Wh battery.

Leaving your gear at a base while doing singletrack will give you more range, but if you’re carrying your pack on an adventure, this will eat into your mileage. Muddy terrain and foul weather can impact range, too.

Comfort
4/5
4

Sat in a trekking position, you’ll use your upper body to shift your weight according to riding conditions. This could mean you get tired in your arms, chest, and shoulders after a long ride.

Sizes XS and S in the Trek Powerfly 4 range come with 27.5” wheels, while sizes M, L, and XL come with 29” wheels. Either way, they’ll smooth out the rough terrain.

The XS version of this eMTB hardtail electric bike comes with an 80mm travel SR Suntour fork, while all larger sizes have a 120mm travel fork. Both are well-suited to rough terrain.

Durability
4/5
4

Though Trek offers a lifetime warranty on the frame, if you haven’t looked after this e-bike, the warranty may be voided.

Clean the bike and oil its working parts after every ride. Keep an eye on chain stretch — change it when it gets to 1 mm per link, and look out for bent/broken teeth on the cassette and front chain wheel. Also, keep an eye on brake pads and hydraulic fluid. Though the Powerfly 4 is waterproof to an extent, take care when it comes to river crossings, as it isn’t designed for complete immersion!

Style
4/5
4

Being a serious electric mountain bike, the Trek Powerfly 4 also looks the part. The clean lines and nice shapes of the frame along with its overall geometry combine to make for a good-looking eMTB.

The choice of colors is good too, from the loud red and black scheme to the muted gray and black. Overall, this bike looks like it means business when thrown about the tracks and trails.

Our Research Methodology

We personally research and test every e-bike featured in our reviews and guides to provide accurate, data-driven recommendations. Learn how we review.

About Our Editorial Team

IMG_0976
Written by Robb Dorr
Co-founder, Cycling Enthusiast
Robb is a massive cycling enthusiast who has more than 20 years of non-motorized cycling experience. He started eBikes.org to lower the barrier of entry to cycling and reduce the intimidation people can experience when getting into the cycling world.

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