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Description
trek e bike fully carbon Trek Powerfly FS 4 Gen 2 – Cahaba CyclesPowerfly FS 4 is a full suspension electric mountain bike built to tackle rugged trail adventures. The plush suspension setup soaks up rough terrain, and the powerful Bosch electric drive system boosts your capacity to crush climbs and mile after mile of singletrack. For e MTB, full suspension is a game changer: it soaks up rugged terrain so you can ride the Bosch pedal assist system to its full potential Treks Removable Integrated Battery (RIB)
Powerfly FS 4 is a full suspension electric mountain bike built to tackle rugged trail adventures. The plush suspension setup soaks up rough terrain, and the powerful Bosch electric drive system boosts your capacity to crush climbs and mile after mile of singletrack.- For e-MTB, full suspension is a game-changer: it soaks up rugged terrain so you can ride the Bosch pedal-assist system to its full potential
- Treks Removable Integrated Battery (RIB) system looks great and is super user-friendly: it fully hides the battery in the frame for protection, makes it easy to remove the battery without tools, and lets you mount a water bottle cage—even on full suspension e-MTBs
- The dropper post lets you lower your saddle on the fly so its out of the way on descents
- The Purion controller has Walk Assist and an intelligent eMTB mode that automatically delivers the right amount of power based on your terrain
- Powerfly FS frames feature a curved top tube that makes standing over the bike easier. Plus, Smart Wheel Sizing means youll get the fastest wheel that fits—29˝ wheels on larger frames, 27.5˝ wheels on smaller frames
Bosch Performance Line CX motor
Bosch Performance Line CX sets the standard for eMTB performance with up to 85Nm of torque and an intelligent eMTB mode with Extended Boost that automatically adjusts the amount of assist based on the terrain.
Custom eMTB Lite mode
Trek eMTBs feature a custom eMTB Lite mode in place of Tour mode. It gives you more natural-feeling power delivery and longer battery life.
Removable Integrated Battery
RIB is a one-piece battery and cover with a built-in handle that can easily be removed and re-installed in the frame with no tools and no hassle. It’s the most convenient way to remove your battery for transport, security, or just easier charging.
What is the range?
To see how far you can ride your electric mountain bike on a single charge, check out Bosch’s range calculator. We’ve auto-filled the variables for this bike model and the average rider, but you can make adjustments to get your most accurate estimate.
Compliant with leading safety regulations
The e-systems on Trek and Electra e-bikes are third-party tested to meet the latest e-bike safety regulations, including the stringent UL 2849 certification — so all you have to worry about is where your e-bike will take you next.
| Frame | Alpha Platinum Aluminum, Removable Integrated Battery (RIB), tapered head tube, internal routing, Motor Armor, magnesium rocker link, rack and fender mount, ABP, Boost148, 100mm travel |
| Fork | SR Suntour XCR 34, air spring, LO R damper, hydraulic lockout, tapered steerer, 41mm offset, oversized crown for eMTB, Boost110, 15mm bolt-on thru axle, 100mm travel |
| Shock | SR Suntour Edge R, 190mm x 45mm |
| Tire | Bontrager XR3 Comp, wire bead, 30tpi, 27.5x2.35 |
| Hub Front | Bontrager sealed bearing, alloy axle, 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 |
| Rim | Alex MD35, tubeless compatible, 32-hole, 35mm width, Presta valve |
| Rim Strip | Bontrager TLR |
| Spokes | 14g stainless steel, black |
| Skewer Rear | Bontrager Switch thru axle, removable lever |
| 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 |
| Chainring | FSA, 36T, steel |
| Brake Rotor | Tektro, 6-bolt, 203mm |
| Pedal | VP-536 nylon platform |
| Saddle | Bontrager Arvada, steel rails, 138mm width |
| Seatpost | TranzX JD-YSP18, 100mm travel, internal routing, 31.6mm, 361mm length |
| Seat Collar | Bolt-on, 36.4mm |
| Handlebar | Bontrager alloy, 31.8mm, 15mm rise, 720mm width |
| Stem | Bontrager Comp, 31.8mm, Blendr compatible, 7 degree, 60mm length |
| Headset | FSA IS-2 |
| Grips | Bontrager XR Trail Comp, nylon lock-on |
| Fender | Trek Powerfly 29 custom fender |
| Battery | Bosch PowerTube 500Wh |
| Motor | Bosch Performance CX, magnesium motor body, 250 watt, 85 Nm, 20mph or 32km/h max assist |
| Charger | Bosch compact 2A, 100-240V |
Geometry Chart
| B B Drop | 2.4 |
| B B Height | 33.2 |
| Chainstay Length | 46.8 |
| Eff Seat Tube Angle | 76.0° |
| Eff Top Tube | 55.4 |
| Frame Reach | 40.5 |
| Frame Size Letter | XS |
| Frame Size Number | 14.5 |
| Frame Stack | 59.9 |
| Head Angle | 66.5° |
| Head Tube Length | 14 |
| Offset | 4.4 |
| Seat Tube | 36.8 |
| Seat Tube Angle | 68.3° |
| Standover | 69.1 |
| Trail | 10.7 |
| Wheelbase | 117 |
| Wheel Size | 27.5" |
| B B Drop | 2.4 |
| B B Height | 33.2 |
| Chainstay Length | 46.8 |
| Eff Seat Tube Angle | 76.0° |
| Eff Top Tube | 56.4 |
| Frame Reach | 41.5 |
| Frame Size Letter | S |
| Frame Size Number | 15.5 |
| Frame Stack | 59.9 |
| Head Angle | 66.5° |
| Head Tube Length | 14 |
| Offset | 4.4 |
| Seat Tube | 39.5 |
| Seat Tube Angle | 68.3° |
| Standover | 69.1 |
| Trail | 10.7 |
| Wheelbase | 118 |
| Wheel Size | 27.5" |
| B B Drop | 3.9 |
| B B Height | 33.5 |
| Chainstay Length | 47 |
| Eff Seat Tube Angle | 76.0° |
| Eff Top Tube | 58.9 |
| Frame Reach | 43 |
| Frame Size Letter | M |
| Frame Size Number | 17.5 |
| Frame Stack | 63.7 |
| Head Angle | 66.5° |
| Head Tube Length | 13 |
| Offset | 4.4 |
| Seat Tube | 42 |
| Seat Tube Angle | 67.5° |
| Standover | 71.2 |
| Trail | 11.4 |
| Wheelbase | 120.6 |
| Wheel Size | 29" |
| B B Drop | 3.9 |
| B B Height | 33.5 |
| Chainstay Length | 47 |
| Eff Seat Tube Angle | 76.0° |
| Eff Top Tube | 62.1 |
| Frame Reach | 46 |
| Frame Size Letter | L |
| Frame Size Number | 19.5 |
| Frame Stack | 64.6 |
| Head Angle | 66.5° |
| Head Tube Length | 14 |
| Offset | 4.4 |
| Seat Tube | 45 |
| Seat Tube Angle | 67.5° |
| Standover | 71.6 |
| Trail | 11.4 |
| Wheelbase | 124 |
| Wheel Size | 29" |
| B B Drop | 3.9 |
| B B Height | 33.5 |
| Chainstay Length | 47 |
| Eff Seat Tube Angle | 76.0° |
| Eff Top Tube | 64.6 |
| Frame Reach | 48.5 |
| Frame Size Letter | XL |
| Frame Size Number | 21.5 |
| Frame Stack | 64.6 |
| Head Angle | 66.5° |
| Head Tube Length | 14 |
| Offset | 4.4 |
| Seat Tube | 50 |
| Seat Tube Angle | 67.5° |
| Standover | 71.3 |
| Trail | 11.4 |
| Wheelbase | 126.5 |
| Wheel Size | 29" |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.3 ★★★★★
Based on 25 reviews
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Product Reviews
★★★★★ 5
Literally perfect and exactly what I needed!
Color: Cool Grey, Size: 24x24x12 inch
I can't recommend this enough! It was exactly what i was looking for! I have an annoying habit of researching everything for months before I purchase something that will get used this often. I finally decided on this one and I was very pleasantly surprised. I needed a wedge pillow to put at my back while sitting in bed. Mostly for when I'm working on my laptop. This one was the perfect height and perfect fit for me.I'm a female that is 5'4 and weigh about 117pds. I wanted something firm enough to support my back, and this most certainly does! It had a very pleasant appearance with the light gray sides. It has a removable cover I can take off and wash when needed. It's portable enough to move from room to room, also works great on my couch and it has amazing versatility. It can also be used as a pillow for someone that might need to sleep at a slight incline. It also works if you need to prop your legs up.
It came vacuum packed. Once opened It said to let is sit for at least 24-48 hrs to give it time to properly inflate. For me, It plumped right up immediately! Again, from someone that does her research, if your looking for something like this at a reasonable price, this is it!
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Reviewed in the United States on May 10, 2026
★★★★★ 5
It was worth every cent
Color: Cool Grey, Size: 24x24x12 inch
I have BPPV. It's a condition where tiny ear crystals come out of place and move within your ear canals - this fools your brain into thinking you're in motion, causing severe dizziness. The most common treatment is the Epley Maneuver, and that actually helps a lot. However, I was going through a period where every single day I'd wake up with severe dizziness. Even if I managed to do the Epley Maneuver and it worked, the entire rest of the day would be ruined because I'd still feel generally unwell and nauseous. I ended up getting a book about BPPV and the author strongly recommended sleeping at at least a 30 degree angle. So, that's why I ended up buying this wedge pillow...
I started using it April 26 and today is May 17. Since I began using it as a pillow, I have not woke up dizzy again. That is so huge! It may be that sleeping at a 30 degree angle deserves 5 Stars but thought I'd give this pillow 5 Stars too, as it's been a great experience. If you suffer from this, here's how the angle should be...If you lay your head on a pillow and open your eyes, you should not be looking at the ceiling. With the right angle, you should be looking at where the wall meets the ceiling. If so, you know you're at the right angle.
As far as pillow itself, I'd say the pillow case fabric is of average quality. Not really remarkable in any way. It seems decent. Good value for the price. The inside is firm (which is just what I needed) but comfortable, and I tend to not move around much the entire night. I like this very much and if it does start wearing out, I'll definitely come back here and buy another. Would recommend.
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Reviewed in the United States on May 17, 2023
★★★★★ 4
A bit too firm but great otherwise
Color: Cool Grey, Size: 24x24x12 inch
I got this wedge pillow primarily to have something to lean my head against (I like to lay on my side when reading or looking at my phone at night sometimes), or to sit upright when reading in bed. It's very comfortable doing both now. It does a really good job at being a nice support for the back of my bed. Only negative is I feel it's too firm. I wouldn't use it as a primary pillow, but it's definitely good for back support at least.
While I won't mark it down for this, I do find it very large. If you have anything smaller then a queen it may take up more of your bed then you'd like.
Definitely recommend. Hopefully will last quite a long while as well.
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Reviewed in the United States on April 11, 2025
★★★★★ 5
So helpful after surgery.
Color: Solid Warm Gray, Size: 24x24x12 inch
Perfect support while recording from abdominal surgery. This pillow maintains its shape and is not overly soft. I used it vertically as a prop for watching television and then used it horizontally to prop myself up to sleep, once I returned to sleeping in bed. I used this daily for 6 weeks or so following surgery. The cover can be removed and machine washed. The non-slip nubbies are helpful. This pilllow is high quality and really helped to minimize pain and improve my sleep after surgery.
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Reviewed in the United States on February 4, 2026
★★★★★ 3
Nice wedge pillow but not enough...
Color: Cool Grey, Size: 24x24x12 inch
It came compacted and when I opened it expanded almost immediately, maybe took like 20 minutes to fully decompress. Its soft and comfortable and the cover is really nice. But it does have a strong chemical smell, which is normal for this kind of brand new memory foam, I just put it on a table with a window open near it and after maybe 24 hours the smell was almost completely gone.
The problem is that I bought this to have a elevated position when sleeping but the 30° are just not enough for me. I wish it was at least 45° but I could not find any pillow with that amount of degree... it's either 30° or like 75° in the other position. At the base of the pillow there is a little ridge that is comfortable for the lower back but makes me slide down in the middle of the night so I end up almost laying flat with my neck on the base ridge. With my slim build my lumbar area gets some nice support but makes my head almost have a "fall backwards" sensation, I like having my neck have a "push-forward" position with my pillow, but when adding another pillow to try and get to a comfortable position it only makes me slide down even more... :/
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Reviewed in the United States on November 6, 2024