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The Powerfly FS+ 4 is a full-power full suspension electric mountain bike for taking on alpine adventures. Its Alpha Platinum Aluminium frame pairs with a RockShox Deluxe suspension package (120 mm rear, 120 mm front) to smooth out rough trails, while a 10-speed Shimano CUES drivetrain provides simple, low maintenance shifting. Tektro Gemini SL 4-piston hydraulic disc brakes give you stopping power at a great value.

The Powerfly FS+ 4 is a full-power full suspension electric mountain bike for taking on alpine adventures. Its Alpha Platinum Aluminium frame pairs with a RockShox Deluxe suspension package (120 mm rear, 120 mm front) to smooth out rough trails, while a 10-speed Shimano CUES drivetrain provides simple, low maintenance shifting. Tektro Gemini SL 4-piston hydraulic disc brakes give you stopping power at a great value.

Trek

Trek Powerfly FS+ 4 Gen 4 Mercury/Dark Web

£4,000.00
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Trek Powerfly FS+ 4 Gen 4 Pennyflake/Black Olive
Pre-Order

With Pre-Order, you can purchase the latest items added to our store in advance of them arriving with us.

Your Pre-Order is prioritised (at no additional charge); meaning that as soon as the product arrives with us, we can wrap it straight back up; ready for collection via Click & Collect or despatch to you — it often never even hits the stock room shelves!

Pre-Launch

With Pre-Launch, the date when we expect to receive the product ourselves is still a little too hazy to be confident in accepting Pre-Orders.

So, instead, you can submit your email address against the item you are interested in and we will email you as soon as stock arrives on the system.

Estimated Delivery & Collection Dates

Estimated Delivery & Collection Dates are given on Pre-Order and Pre-Launch products. They are for indication purposes only and can change at any time without notice.

The dates we provide are based on indications given by our suppliers. Whenever we get updated information from our suppliers we will endeavour to update the Estimated Delivery & Collection Dates provided on product pages.

We estimate this will be ready for despatch to you or collection via Click & Collect on Undetermined
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When you purchase this item, you will earn of rewards points to spend on your next purchase from us. You can spend your Rewards balance in-store & online.

No Quibble Returns

Online/ Mail Order Returns:
  • If for any reason you are not satisfied, you can return any item ordered via mail order provided that the goods are complete with all relevant packaging in an unused and re-saleable condition within 14 days of the date of shipment for a refund or an exchange. It's that simple.
  • We make no charge for returns - there is no restocking fee
  • Returned goods must be unused, in a saleable condition and in their original packaging with all labels still attached. Please note that items showing signs of wear or those that have been engraved, altered, resized, or damaged in any way cannot be accepted for return.
  • We cannot accept returns on clothing that has been personalised e.g. with name printing
  • We will credit the card we have on file for you this may take up to 10 working days to appear as cleared funds
  • If the original payment was via PayPal we will credit the PayPal account that the order was placed with
  • Value of goods only will be refunded.
  • For the purpose of hygiene, shorts, knicks and tights with a seatpad cannot be returned

NOTE: Please do not tape up, or attach labels direct to the retail packaging, please wrap the product first.

  • Goods must be returned within 14 days of receipt.
  • Goods must be in original packaging.
  • Goods must not be fitted or used.
  • Goods must be accompanied with a copy of your Original Receipt and aCover note with your name, address, reason for return, explaining if you would like a exchange or refund

If you return something due to it not fitting or being suitable, you will need to pay the postage costs to return it to us.

If you return something due to it being faulty we refund up to £10 carriage for bikes & frames and £5 for smaller items. If your return exceeds this amount please contact us and we can arrange collection for you. Please state a date and collection address (not Saturday or Sunday) where the goods can be collected from.

We recommend you use recorded delivery or registered post to return items so as to cover yourself against loss.

Customers outside of the UK must follow the instructions belowalong with our standard returns procedure.

To help us deal with your return to us quickly and efficiently you must mark all returns as RETURNED GOODS – FAILED SALE. This must be clearly marked on the customs information document ( CN22 and/ or CN 23) on the outside of the packaging. Failure to do so may result in the goods being refused at customs in the UK and so being returned to the sender.

If you have paid import duty for goods received, and subsequently return the goods to us, it should be possible for you to claim a refund of duties from your local Customs Authority. To do this, you will need to show them proof of duty paid and proof of export (e.g. certificate of posting) when claiming your refund.

Should you have any further queries on duties payable/refundable, please contact your local Customs Authority.

Damaged Goods

Before you sign for your goods make sure you are satisfied the contents are not damaged.

If in any doubt write: "GOODS DAMAGED"

IMPORTANT: If you sign that the item as 'has been received in good condition' you will have no claim later if the product is found to be damaged.

Damaged goods must be reported within 24 hours of receipt.

Warranty & Warranty Returns

We never want an item to fail but we recognise that failures can happen. When you buy wih Pedal Revolution you can have total piece of mind and know that we will give you issue our full attention. Our team work with suppliers and brands to ensure any warranty case is handled with the upmost care and is processed as quickly as possible.

Warranty items need to be returned to us at the below address with the package clearly marked as "Warranty" so that we can send them to the supplier to start the warranty procedure - warranty cases are handled by the brand or supplier of the goods and normally have a 1-3 week turn around.

Warranty items must be returned with a copy of your original receipt (the is a requirement of the brands/ suppliers).

No monies can be refunded until an item is accepted for warranty by the brand/ supplier

Returns Address

Returns Dept
Pedal Revolution
63-67 Bethel Street
Norwich
Norfolk
NR2 1NR

Trek Powerfly FS+ 4 Gen 4 Mercury/Dark Web

Season:2026

Brand:Trek

Code:48614GRY

It's right for you if...

You're itching to explore and want a full-power, fully-capable e-MTB to take you there. You want the trail-smoothing benefits of a full-suspension mountain bike for rough roads and light singletrack, but don't see steep rock gardens or jump trails in your forecast.

The tech you get

An Alpha Platinum Aluminium frame with a Bosch Performance Line CX motor (85 Nm, 250 W), a 600 Wh PowerTube RIB 2.0 removable integrated battery and Purion 200 controller. 130 mm front and 120 mm rear suspension from a RockShox Recon Silver RL fork with Solo Air spring and Motion Control damper and a RockShox Deluxe Select shock. Tubeless-ready wheels with puncture-resistant 2.4˝ tyres, a 10-speed Shimano CUES drivetrain for clean shifts, a Bontrager Line dropper post and hydraulic disc brakes.

The final word

Explore the beyond with Powerfly FS+ 4. This capable and powerful e-MTB is ready to keep you soaring up the trail with a grin as big as you have on the downs. Its capable full-suspension set-up smooths rough tracks and boosts confidence while you venture to alpine yurts or just around town.

Why you'll love it

  1. The Powerfly FS+ gives you the powerful boost you crave on high alpine climbs, confident comfort on descents and a big battery for getting far out there
  2. Bosch's Performance Line CX motor delivers plenty of torque for steep, punchy climbs and is easy to control with the Purion 200 remote – plus you can customise it in the eBike Flow app
  3. Its RIB 2.0 removable integrated battery is easy to remove for travel and storage, and its virtually rattle-free while you ride
  4. Want even more boost? With the Bosch e-Bike Flow app, you can increase torque to 100 Nm and peak power up to 750W.
  5. It's compatible with Bosch PowerMore booster batteries, and you can even upgrade the 600 Wh battery for a bigger 800 Wh option to get way out there. Both parts can be retrofitted by the dealer
Technical Information

  • Frame

    Alpha Platinum Aluminium, Removable Integrated Battery (RIB 2.0), tapered headtube, guided internal routing, Motor Armor, angle-adjust headset, Mino Link adjustable geometry, adjustable leverage rate, 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

    Shock

    RockShox Deluxe Select R, 210x50 mm

    Max compatible fork travel

    See service manual

    Hub front

    Shimano TC500 alloy, CentreLock, 110x15 mm thru axle

    Hub rear

    Shimano TC500 alloy, CentreLock, 148x12 mm thru axle

    Skewer rear

    Bontrager Switch thru-axle, removable lever

    *Rim

    Size:S , M , L , XL
    Bontrager Line TLR 30, Tubeless-Ready, 28-hole, Presta valve

    Size:S , M , L , XL
    Bontrager Line TLR 30, Tubeless-Ready, 32-hole, Presta valve

    Spokes

    14 g stainless steel, black

    *Tyre

    Size:S
    Bontrager Gunnison Pro XR, Tubeless-Ready, wire bead, 60 tpi, 27.5x2.40"

    Size:M , L , XL
    Bontrager Gunnison Pro XR, Tubeless Ready, dual compound, aramid bead, 60 tpi, 29x2.40"

    Tyre part

    Bontrager TLR sealant, 180 ml/6 oz

    Rim strip

    Bontrager TLR

    Max tyre size

    Frame: 29x2.50" (S: 27.5x2.50"), Fork: see manufacturer

    Battery

    Bosch PowerTube 600 Wh, smart system

    Charger

    Bosch standard 2A, 230V, smart system

    Computer

    Bosch Purion 200

    Motor

    Bosch Performance Line CX, 20 mph / 32 km/h max assist (25 km/h max assist in EU and APAC)

    Shifter

    Shimano U6000, 10-speed

    Rear derailleur

    Shimano CUES U6000 GS

    Crank

    FSA Bosch CK-220, 36T ring, 165 mm length

    Chainring

    FSA, 36T, steel

    Cassette

    Shimano CUES LG300, LINKGLIDE, 11-48, 10-speed

    Chain

    Shimano LG500, 9/10/11-speed

    Pedal

    VP-536 nylon platform

    Max. chainring size

    1x: 38T

    Saddle

    Bontrager Verse P3, steel rails

    *Seatpost

    Size:S
    Bontrager Line Dropper, 100mm travel, MaxFlow, internal routing, 31.6 mm, 310 mm length

    Size:M , L , XL
    Bontrager Line Dropper, 170 mm travel, MaxFlow, internal routing, 31.6 mm, 450 mm length

    Handlebar

    Bontrager Comp, alloy, 31.8 mm, 40mm rise, 780 mm width

    Grips

    Bontrager XR Trail Comp, nylon lock-on

    Stem

    Bontrager Comp, 31.8 mm, Blendr compatible, 7-degree, 50 mm length

    Head set

    FSA IS-2, 1-1/8" top, 1.5" bottom

    Brake

    Tektro Gemini SL 4 piston hydraulic brake

    Brake rotor

    Tektro, CentreLock, 203 mm

    Rotor size

    Max brake rotor sizes – Frame: 220 mm, min 180 mm, Fork: see fork manufacturer

    Mudguard

    Trek 27.5" custom fender

    Weight

    M – 24.58 kg/54.19lb (with TLR sealant, no tubes)

    Weight limit

    This bike has a maximum total weight limit (combined weight of bicycle, rider and cargo) of 136 kg (300 lb).

Sizing Information
size-table
SizeRider HeightInseam
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"

Geometry

All measurements provided in cm unless otherwise stated.

Sizing table
Frame size numberFrame size letterWheel sizeA —Seat tubeB —Seat tube angleEffective seat tube angleC —Head tube lengthD —Head angleE —Effective top tubeF —Bottom bracket heightG —Bottom bracket dropH —Chainstay lengthI —OffsetJ —TrailK —WheelbaseL —StandoverM —Frame reachN —Frame stack
15.5"S27.5"38.071.1°77.0°13.065.0°56.333.03.045.84.412.3120.175.642.559.7
17.5"M29"40.071.3°77.0°11.066.0°59.533.54.546.14.412.5122.378.045.062.9
19.5"L29"42.071.2°77.0°13.066.0°63.033.54.546.14.412.5125.777.547.564.7
21.5"XL29"45.072.4°77.0°15.066.0°65.433.54.546.14.412.5129.077.850.066.6
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