Trek Powerfly FS+ 4 800 Gen 4 2027 - Electric Mountain Bike
The Trek Powerfly FS+ 4 800 Gen 4 is a full-suspension electric mountain bike built to explore further. With Bosch Performance Line CX assistance, 130/120mm RockShox suspension and a durable aluminium frame, it's ready for challenging trails and long rides.
Key Features:
- Alpha Platinum Aluminium frame with ABP suspension and 120mm rear travel
- RockShox Recon Silver fork with 130mm travel and Solo Air spring
- RockShox Deluxe Select rear shock with 120mm rear suspension travel
- Shimano CUES LINKGLIDE 1x10-speed drivetrain with wide-range cassette
- Tektro HD-M5140 hydraulic disc brakes
- 29in wheels with Bontrager Gunnison Elite XR 2.4in tubeless-ready tyres
- Mino Link geometry adjustment and TranzX 170mm dropper post
- Available with 0% APR finance
Drive Information:
- Motor: Bosch Performance Line CX mid-drive motor with 85Nm of torque
- Battery: Bosch PowerTube 800Wh integrated battery
- User Interface: Bosch LED Remote with Bosch Smart System integration
The Trek Powerfly FS+ 4 800 Gen 4 is designed for riders who want the confidence of full suspension with the range and capability of Bosch's latest smart system. Whether you're riding technical trail centres, exploring natural singletrack or taking on longer mountain adventures, it combines capable suspension with dependable electric assistance to help you cover more ground.
The Alpha Platinum Aluminium frame is engineered specifically for eMTB riding, balancing strength, durability and confident handling. Trek's proven ABP (Active Braking Pivot) suspension design helps keep the rear suspension active while braking for improved control over rough terrain, while the Mino Link system allows riders to fine-tune the bike's geometry to suit different trails and riding styles. Guided internal cable routing keeps the frame looking clean and protects cables from the elements, while the Universal Derailleur Hanger (UDH) makes replacement hangers easier to source. Integrated rack and mudguard mounts also add versatility for riders looking to use the bike beyond the trail.
Trek has also transitioned the frame to lower-emission aluminium produced using renewable energy, helping reduce the environmental impact of manufacturing without compromising strength or performance.
Suspension comes from RockShox, with a Recon Silver fork delivering 130mm of travel through its Solo Air spring and Motion Control damper. The adjustable lockout improves pedalling efficiency on smoother terrain, while the RockShox Deluxe Select rear shock provides 120mm of rear wheel travel to smooth out roots, rocks and rough trail surfaces for greater comfort and control.
Bosch's Performance Line CX motor delivers up to 85Nm of torque with intelligent assistance that feels smooth and natural on technical climbs and flowing trails. The eMTB mode automatically adjusts support based on terrain and rider input, while Extended Boost helps carry momentum over obstacles and steep steps without requiring constant pedal input.
Power comes from Bosch's integrated 800Wh PowerTube battery, providing the capacity needed for long rides and ambitious adventures. Trek's Removable Integrated Battery (RIB) system allows the battery to be removed quickly without tools using its integrated handle, making charging, transport and storage much more convenient.
The Bosch Smart System connects with the Bosch eBike Flow app, allowing riders to customise assistance modes, record ride data, access navigation, receive service reminders and synchronise rides with services including Strava and Apple Health. The Bosch LED Remote provides simple control of assistance modes while displaying battery level and ride information at a glance.
The Shimano CUES 1x10-speed drivetrain uses LINKGLIDE technology for enhanced durability under the higher loads generated by eMTBs. Combined with an 11-48T cassette, it delivers dependable shifting and a wide gear range for technical climbs and faster trail sections.
Tektro HD-M5140 hydraulic disc brakes provide reliable stopping power and control in all conditions, giving riders confidence on steep descents and challenging terrain.
Rolling on 29-inch wheels with Bontrager Gunnison Elite XR 2.4-inch tubeless-ready tyres, the Powerfly FS+ 4 offers stable handling, dependable grip and the option to run lower tyre pressures for increased traction and puncture resistance. A TranzX internally routed dropper post with 170mm of travel completes the package, making it easier to move around the bike on steep descents and technical features.
Combining Bosch's proven Performance Line CX drive system, a large 800Wh battery and capable RockShox suspension, the Trek Powerfly FS+ 4 800 Gen 4 is a versatile full-suspension eMTB that's equally at home on demanding trail rides and all-day off-road adventures.
Occasionally, without notice, manufacturers change product design and/or specifications.
| Frame | Alpha Platinum Aluminium, Removable Integrated Battery, tapered headtube, guided internal routing, Motor Armor, Mino Link adjustable geometry, adjustable leverage rate, ABP, UDH, rack and mudguard mounts, Boost 148, 120 mm travel |
| Fork | RockShox Recon Silver, Solo Air spring, Motion Control damper, lockout, tapered steerer, 42 mm offset, Boost110, Maxle Stealth, mudguard mounts, 130 mm travel RockShox Recon Silver, Solo Air spring, Motion Control d |
| Rear Shock | RockShox Deluxe Select, 210x50mm |
| 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 HD-M5140 hydraulic disc |
| Rear Brake | Tektro HD-M5140 hydraulic disc |
| Rear Mech | Shimano CUES U6000 GS |
| Speed | 10 |
| Front Hub | Shimano TC500 alloy, CentreLock, 110x15 mm thru axle |
| Rear Hub | Shimano TC500 alloy, CentreLock, 148x12 mm thru axle |
| Front Tyre | Bontrager Gunnison Elite XR, Tubeless Ready, wire bead, 60 tpi, 29x2.40" |
| Rear Tyre | Bontrager Gunnison Elite XR, Tubeless Ready, wire bead, 60 tpi, 29x2.40" |
| Seat Post | TranzX JD-YSI34, 170 mm travel, internal routing, 31.6 mm |
| 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 800 Wh, smart system |
| Motor | Bosch Performance Line CX |
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.
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