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Description
trek 4100 mountainbike 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
4.7 ★★★★★
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Product Reviews
★★★★★ 5
So soft!
Color: Oak, Size: Throw(50"x60"), Color: Oak, Size: Throw(50"x60")
This blanket is so soft and cute. It was the perfect addition to my daughter’s hang out spot.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 29, 2026
★★★★★ 5
PERFECT
This blanket is exactly what I was looking for. I purchased the twin size but use it as a throw on my couch and all my guest love it. It is warm and snuggly.
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Reviewed in the United States on March 22, 2026
★★★★★ 5
Beautiful
Color: Oak, Size: Throw(50"x60")
Very nice quality. Colorful and texture are beautiful.
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Reviewed in the United States on March 12, 2026
★★★★★ 5
GET IT! Luxurious, soft and modern
Color: Black, Size: King (108" x 90"), Color: Black, Size: King (108" x 90")
I don’t write many reviews, but had to for this one. This blanket is SO SOFT and it has a little weight to it. The king size is perfect and even a little longer than most king comforters. It is double sided, so the underside fuzz is a little shorter. It kept us warm but not too warm. If you overheat easily, this is perfect. I didn’t notice any shedding. I haven’t washed it yet but hopefully it won’t lose its luster once I do. I love the bubble pattern of the fur. The fur is luxurious and not cheap looking. It looks amazing on our bed.
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Reviewed in the United States on February 9, 2026
★★★★★ 5
Amazingly soft and beautifully made!
Color: Cream White, Size: Twin (60" x 80")
I was on the fence about purchasing this blanket as I was looking at other options and having trouble deciding. I ended up taking a chance on this one and I'm very happy with the result. This blanket is exceptionally soft and will keep you toasty warm. I keep mine at the end of my bed. It adds a cozy aesthetic to my bedroom. To put it simply, this blanket is both functional and beautiful.
Mine arrived in a air-sealed bag, but it fluffed right up the moment I opened the bag. I decided to wash mine before using it, however, it did not have any unpleasant smell that made me do so. My only reason for washing it is because I have allergies and sensitive skin, and it was more a precaution than anything else. Regardless, it washed up nicely and even after coming straight out of the washer was still fluffy and soft. If you also decide to wash your blanket, DO NOT put it in the dryer. You will absolutely ruin the faux fur if you do. I hung mine up on the staircase banister to dry overnight and it was ready to toss on my bed the next morning.
What I'm super impressed about with this blanket is that I haven't experienced any shedding whatsoever. I haven't found fur on my bed, there was no fur in the washer, nor have I found any tufts of fur after dragging it back and forth from my bedroom to the living room.
It's a quality blanket that looks exactly like the more expensive name brand ones, but without the hefty price tag. I'd also like to note that my cat LOVES laying on it. I'm going to order a smaller one specifically for him to put in the living room on his bed.
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Reviewed in the United States on March 5, 2025