Trek Powerfly FS+ 4 Gen 4 2026 - Electric Mountain Bike
Equipped with full suspension, Bosch Performance CX power and a 600Wh battery, the Powerfly FS+ 4 Gen 4 offers smooth, supportive riding for exploring everything from forest trails to rough back lanes and hilly commutes.
Key Features:
- Alpha Platinum Aluminium frame with 120mm travel and ABP suspension
- RockShox Recon Silver RL fork, Solo Air spring, 130mm travel
- RockShox Deluxe Select rear shock with 120mm of smooth trail travel
- Shimano CUES 10-speed drivetrain with LINKGLIDE durability
- Tektro Gemini SL 4-piston hydraulic disc brakes for powerful braking
- 29" Bontrager Line TLR 30 tubeless-ready wheels with 2.4" tyres
- Bontrager Line dropper post and mounts for racks, lights and mudguards
- Available with 0% APR finance
Drive Information:
- Bosch Performance Line CX motor with 85Nm of torque
- Bosch PowerTube 600Wh smart system battery
- Bosch Purion 200 display with smart system connectivity
The Trek Powerfly FS+ 4 Gen 4 is designed for riders who want full-suspension comfort paired with powerful pedal-assist technology to go further and ride longer. Whether you're exploring forest singletrack, cruising rugged gravel routes, or simply looking to smooth out your daily commute, this capable e-MTB blends support, control and versatility into one trail-ready package.
At its core is a Bosch Performance Line CX motor, providing 85Nm of torque and smart system integration for intuitive, natural-feeling pedal assist. It’s paired with the new Purion 200 display and remote, giving you simple access to ride data and power modes, while also connecting to Bosch’s eBike Flow app for updates, ride customisation and route tracking.
Power comes from a 600Wh Bosch PowerTube battery, secured in Trek’s RIB 2.0 (Removable Integrated Battery) system. This keeps things quiet, protected and easy to remove for charging or storage. Need more range? It’s PowerMore compatible, or you can upgrade to an 800Wh battery for even longer rides.
The full-suspension Alpha Platinum Aluminium frame uses Trek’s ABP (Active Braking Pivot) rear suspension platform, helping maintain traction and control under braking. With 130mm front and 120mm rear travel, the RockShox Recon Silver RL fork and Deluxe Select shock soak up trail chatter and give confidence over roots, rocks and ruts.
The Shimano CUES 10-speed drivetrain delivers reliable shifting with LINKGLIDE durability, ideal for the demands of e-MTB torque and off-road terrain. Stopping power is handled by Tektro Gemini SL 4-piston brakes, giving great modulation and control on descents and in mixed conditions.
29” Bontrager Line TLR 30 wheels are paired with Bontrager Gunnison Pro XR 2.4” tyres, offering a blend of grip, speed and puncture protection. The included dropper post helps your rider stay agile and confident on technical trails.
With mounts for a rack, lights, mudguards and a kickstand, the Powerfly FS+ 4 Gen 4 is as ready for bikepacking and commuting as it is for mountain trail adventures. It’s a truly versatile full-sus e-MTB that makes exploring more accessible.
Occasionally, without notice, manufacturers change product design and/or specifications.
| Frame | Alpha Platinum Aluminium, Removable Integrated Battery (RIB 2.0), tapered headtube, guided internal routing, 34.9 mm seat tube, ABP, UDH, rack and mudguard mounts, Boost 148, 120 mm travel |
| Fork | RockShox Recon Silver RL, Solo Air, Motion Control damper, lockout, tapered steerer, 42 mm offset, Boost110, 15 mm Maxle Stealth, 130 mm travel |
| Rear Shock | Boost 148, 120 mm travel |
| Headset | FSA IS-2, 1-1/8" top, 1.5" bottom |
| Stem | Bontrager Comp, 31.8 mm, Blendr compatible, 7-degree, 50 mm length |
| Bars | Bontrager Comp, alloy, 31.8 mm, 40mm rise, 780 mm width |
| Front Brake | Tektro Gemini SL 4 piston hydraulic brake // Tektro Gemini SL 4 piston hydraulic brake |
| Rear Brake | Tektro Gemini SL 4 piston hydraulic brake // Tektro Gemini SL 4 piston hydraulic brake |
| Rear Mech | Shimano CUES U6000 GS |
| Shifters | Shimano U6000, 10-speed |
| Speed | 10 |
| Rims | Bontrager Line TLR 30, Tubeless-Ready, 28-hole, Presta valve // Bontrager Line TLR 30, Tubeless-Ready, 32-hole, Presta valve |
| Front Hub | Shimano TC500 alloy, CentreLock, 110x15 mm thru axle |
| Rear Hub | Shimano TC500 alloy, CentreLock, 148x12 mm thru axle |
| Front Tyre | Bontrager Gunnison Pro XR, Tubeless Ready, dual compound, aramid bead, 60 tpi, 29x2.40" |
| Rear Tyre | Bontrager Gunnison Pro XR, Tubeless Ready, dual compound, aramid bead, 60 tpi, 29x2.40" |
| Seat Post | Bontrager Line Dropper, 170 mm travel, MaxFlow, internal routing, 31.6 mm, 450 mm length |
| Saddle | Bontrager Verse P3, steel rails |
| Chainset | FSA Bosch CK-220, 36T ring, 165 mm length |
| Chain | Shimano LG500, 9/10/11-speed |
| Cassette | Shimano CUES LG300, LINKGLIDE, 11-48, 10-speed |
| Pedals | VP-536 nylon platform |
| Battery Size (WH) | Bosch PowerTube 600 Wh, smart system |
| Motor | Bosch Performance Line CX, 20 mph / 32 km/h max assist (25 km/h max assist in EU and APAC) |
| User Interface | Bosch Purion 200 |
Trek Powerfly+ FS Gen 4 Size Chart
| Size | Height cm | Height Feet / Inches | Inseam cm | Inseam Inches |
|---|---|---|---|---|
| S | 155 - 165 cm | 5'1" - 5'5" | 74 - 78 cm | 29" - 31" |
| M | 165 - 176 cm | 5'5" - 5'9" | 79 - 83 cm | 31" - 33" |
| L | 177 - 188 cm | 5'10" - 6'2" | 84 - 89 cm | 33" - 35" |
| XL | 188 - 195 cm | 6'2" - 6'5" | 89 - 91 cm | 35" - 36" |
What size frame do I need if I am between sizes? - read here
Trek Powerfly FS+ Gen 4 2025 Geometry Chart
| Size | S | M | L | XL |
|---|---|---|---|---|
| Stack | 597 | 629 | 647 | 666 |
| Reach | 425 | 450 | 475 | 500 |
| Head Tube Length | 130 | 110 | 130 | 150 |
| Head Tube Angle | 65.0° | 66.0° | 66.0° | 66.0° |
| Bottom Bracket Height | 330 | 335 | 335 | 335 |
| Bottom Bracket Drop | 30 | 45 | 45 | 45 |
| Trail | 123 | 125 | 125 | 125 |
| Fork Rake/Offset | 44 | 44 | 44 | 44 |
| Chainstay Length | 458 | 461 | 461 | 461 |
| Wheelbase | 1201 | 1223 | 1257 | 1290 |
| Top Tube Length (horizontal) | 563 | 595 | 630 | 654 |
| Standover Height | 756 | 780 | 775 | 778 |
| Seat Tube Length | 380 | 400 | 420 | 450 |
| Seat Tube Angle | 71.1° | 71.3° | 71.2° | 72.4° |
| Effective Seat Tube Angle | 77.0° | 77.0° | 77.0° | 77.0° |
All measurements are in mm unless otherwise stated.
The above table shows the standard geometry for the bicycle as shipped, other geometry configurations may be available with certain bikes. Please contact us via Live Chat to find out more.
Customer reviews and Q&A's are disabled because you declined functional cookies.
To enable reviews and Q&A's click the 'Cookie Settings' button below and enable functional cookies.
Trek Powerfly FS+ 4 Gen 4 2026 - Electric Mountain Bike
Cycle to Work is a salary sacrifice scheme, where you can save up to 42% off a new Bike and Safety equipment. This means the cost is deducted from your salary as a non-cash benefit, so you save on tax and national insurance.
Here at Tredz, we accept Cycle to Work vouchers from all national schemes. For more information click here.
We understand that the Cycle to Work process can be a little slower than we would all like - so to help you pick the perfect ride, we're now offering FREE Cycle to Work Reservations on any in stock bike (T&C's apply). Simply speak to a member of our Online Bike Experts Team via Live Chat to discuss your reservation. Find out more here.
At Tredz we make finance easy. You can choose from a range of flexible finance repayments from 6 months up to 48 months, choose to place a deposit and pay the balance on finance. Go with a 0% APR finance deal with absolutely no interest on payments, or a 9.9% APR Buy Now Pay later option with a choice of 12 or 24 deferred payment options, or a longer-term 14.9% APR option with lower monthly payments. For more information click here.
We offer a fast, high-quality delivery service with flexible options to suit your schedule - including free delivery* over £30, next day delivery, Click & Collect, and now 24/7 InPost locker delivery for qualifying orders. Learn more about InPost
*Courier deliveries to Northern Ireland, Isle of Man, Isle of Wight, Channel Islands and the Scottish Highlands/Islands will incur a charge.At Tredz, we’re committed to bringing you the best products at the best prices. If you find a product cheaper elsewhere, simply contact us for an immediate response using our live chat service. Click here to discuss your price match with an agent now for help.
Subject to Terms and Conditions
At Tredz, if you are not 100% happy with your order, then you can use our simple hassle free returns service. Simply return the item new and unused in the manufacturers original packaging within 90 days of purchase. Bikes and larger items are collected by courier.
When you receive your bike, all you'll need to do is unpack it, attach the pedals, turn the handlebars and ride.
To help you get started we have put together a handy Bike Building Guide, click here.