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The Trek Borrego+ 4 Is Built for Wherever Adventure Takes You
Last updated: July 2026
The Trek Borrego+ 4 is a new breed of fat tire electric bike — one that trades pavement-only manners for real go-anywhere capability.
With durable 4" tires, front suspension, and an upright, confidence-inspiring riding position, this adventure e-bike is happy on gravel forest roads, sandy trails, or the commute in between.
A 500W throttle motor and 110km of range mean the Borrego+ 4 isn't just built to look tough — it's built to actually go the distance, whether that's a weekend exploring Kelowna's backroads or a straightforward ride across town.
Best for:
- Backroad and forest-road exploring
- Hauling gear, groceries, or a trailer
- Riders who want max range without recharging mid-ride
What's New: An All-New Platform for Trek's Fat Tire Electric Bike Lineup
The Borrego+ platform marks Trek's entry into the fast-growing fat tire electric bike category, and the Borrego+ 4 is built from the ground up to compete there — not as an afterthought bolted onto an existing frame. It's an entirely new platform, engineered specifically around the demands of thick, capable tires and mixed-terrain riding.
At the center of the system is a 500W Hyena hub-drive motor producing 90Nm of torque, paired with a 720Wh top-eject battery for up to 110 kilometers of range — a meaningful jump for riders who want to explore farther without watching a battery gauge all day. Trek also built in a standard torque sensor for more natural pedal-assist feel, alongside full throttle support, giving riders the flexibility to choose how much they want to pedal versus simply twist and go.
The frame itself was designed around simplicity and long-term serviceability: an intuitive junction box, cable routing tucked cleanly through the frame, and a semi-external motor control unit all make this a bike that's as easy to live with as it is to ride. Add in Trek's new eLock digital security system with phone-as-key access, and the Borrego+4 is as much a step forward in the smart e-bike experience as it is in off-road capability.
Key Features & Specs
- Motor – Hyena 500W rear-hub motor, 90Nm torque, throttle + pedal-assist with standard torque sensor
- Battery – 720Wh top-eject, removable/lockable
- Range – Up to 110km (varies by terrain, assist level, and load)
- Top Speed – Up to 32km/h via throttle or pedal-assist
- Frame – Universal midstep design with upright seating
- Fork – 80mm travel suspension fork
- Drivetrain – 8-speed derailleur
- Brakes – Hydraulic disc, 203mm rotors, post-mount, with motor cutoff
- Wheels/Hub Spacing – 178mm bolt-on rear / 135mm bolt-on front
- Tires – Bontrager 26x4" Borrego tires
- Display/Control – Full-color display with speed, power, range, lights, turn signals, and eLock security; Trek Central app compatible
- Weight – S/M: 86.5lbs (39.23kg) / M/L: 87lbs (39.46kg)
Who Is This Bike For?
The Borrego+4 is built for riders who want one bike that can handle a little bit of everything — gravel roads out toward Knox Mountain, sandy lakeside paths, or just a comfortable commute with the option to twist the throttle and let the motor do the work. The upright midstep frame and confident stand-over height make it approachable for newer riders, while the range and torque give more experienced riders a genuine adventure tool.
Performance
With 90Nm of torque and full throttle support, the Borrego+4 delivers immediate, confident power off the line — useful for loaded rides with the MIK rack or child seat attached. The 4" tires and front suspension smooth out washboard gravel and loose terrain, while the upright geometry keeps handling predictable rather than twitchy, even at speed.
Fresh Air Expert Insight
Our team's honest take: the 110km range is the real headline here — most riders won't come close to draining it on a normal day out. The trade-off is weight; at roughly 87lbs, this isn't a bike you're carrying up stairs. If you want one e-bike that handles commuting, hauling, and light trail wandering without complaint, the Borrego+4 earns its keep.
Insight from our Fresh Air Kelowna gear specialists, who test and ride the bikes we carry before recommending them.
Why Riders Love the Trek Borrego+ 4
- Go-anywhere confidence – 4" tires and front suspension handle gravel, sand, and rough pavement without hesitation
- All-day range – 110km means fewer charging interruptions on long rides
- Throttle or pedal, your call – full throttle support plus a standard torque sensor for natural pedal-assist feel
- Ready to haul – MIK HD rear rack rated to 60lb, compatible with child seats and panniers
- Smart security built in – new eLock system with phone-as-key access via the Trek Central app
- Ride after dark – integrated lights with brake and turn signals stay powered up to 3 hours after the battery hits 0%
Quick Comparison
The Borrego+ 4 isn't trying to be everything — it's built for riders who want to go further off the beaten path. Here's how it stacks up against two other throttle e-bikes we carry, so you can find the one that actually matches how you ride.
| FEATURE | Trek Borrego+ 4 | Trek FX+ 1 Midstep | Electra Townie Go! |
|---|---|---|---|
| Motor | Rear-hub motor — 500 W, throttle assist | Hyena hub-drive — 500 W / 60 Nm | Hub-drive motor — 500 W / 60 Nm |
| Battery | Long-range battery, up to 110 km range | 540 Wh, integrated in down tube | 540 Wh integrated |
| Frame | Midstep frame, 4" fat tires, 80 mm front suspension | Alpha Gold Aluminum, Midstep geometry, internal battery | 6061-T6 aluminum low-step, Flat Foot Technology® |
| Throttle / Assist | Throttle assist, confident speed up to 32 km/h | Throttle + pedal assist, up to 32 km/h both modes | Class 2 — thumb throttle + pedal assist, up to 20 mph (32 km/h) |
| Charger | 3A, 48V output, 100V-240V AC input | Trek EasyMag magnetic charger, 2.7A, wall-mount storage | Custom magnetic charger, 3A, charges to 100% in 5.5 hrs |
| Drivetrain | 8-speed | Shimano ESSA, 8-speed | MicroShift Mezzo, 8-speed |
| Brakes | Hydraulic disc brakes | Rush hydraulic disc, 180 mm rotors | Rush hydraulic disc, 180 mm rotor, brake switching |
| Lighting / Safety | Integrated front & rear lights, turn signals, brake light | Integrated lights, turn signals, brake light | Herrmans headlight, Sate-lite turn signal + brake light |
| Cargo | Full front & rear fenders, MIK-compatible heavy-duty rack support (37 kg per tray) | Rack & fender mounts (rack not included) | MIK HD rear rack included, child-seat rated |
| Weight | 39.46 kg / 87 lbs | 22.00 kg / 48.51 lb (size M) | 26.19 kg / 57.74 lb (size M/L) |
| Price | $3,199.99 CAD | $2,999.99 CAD | $2,999.99 CAD |
| Best For | Fat-tire adventure riding, gravel & forest roads, backcountry exploring | City commuting, errands, bike-path & rail-trail riding, easy mounting | Relaxed upright cruising, comfort-first commuting, child-seat-ready errands |
Want to go further off pavement and haul more gear? The Borrego+ 4's bigger battery and fat tires are built for exactly that. Mostly sticking to town and bike paths? The FX+ 1 Midstep or Townie Go! will get you there just as comfortably — and at a lighter weight to boot.
See the SBorrego+ 4 in Action
The 720Wh battery delivers up to 110km of range, though actual distance depends on terrain, assist level, and total load. Charging to 80% takes about 4 hours, and a full charge takes roughly 5.5 hours.
Both throttle and pedal-assist support speeds up to 32km/h. Check local electric bike regulations for where this is permitted to ride.
The Borrego+4 weighs about 87lbs depending on frame size. It's not a bike you'll be carrying upstairs, but the weight reflects the battery size and rack capacity that make its range and hauling ability possible.
Yes. The MIK HD rear rack is rated for up to 60lbs and compatible with Burley and Thule child seats. The bike also uses a bolt-on rear axle, making it trailer-compatible.
The Borrego+4 is built for mixed terrain — gravel, sand, and rough pavement rather than technical singletrack. It's a strong fit for backroad and forest-road adventures around Kelowna's gravel network, though riders looking for technical trail capability may want to look at our full-suspension e-MTB lineup instead.
Yes, the throttle can be used independently of pedaling. Note that removing the throttle lever does not legally reclassify the bike's speed class, since this is controlled via firmware rather than hardware.
