To improve your shopping experience today and in the future, this site uses cookies.
I Accept Cookies
The Trek Powerfly 4 delivers the capability and versatility of a mountain bike at a great price! Built with MTB parts that are built to last and a 250W motor, nothing can get in your way!
The Trek Powerfly 4 delivers the capability and versatility of a mountain bike at a great price! Built with MTB parts that are built to last and a 250W motor, nothing can get in your way!

Trek Powerfly 4 500Wh Electric Mountain Bike 2022 in Grey/Black

£3,087.00 £3,250.00 5% off
in Customer Rewards when you buy this item today

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!


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
Earn Rewards
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.

Hassle free returns

Any item, except food or face masks, can be returned to us for any reason within 90 days, provided that the item has not been used or fitted and is returned in its original packaging with valid proof of purchase.

Online or in-store purchases can both be returned to any store free of charge or can be returned by post after completing the online returns form. If you are returning an item due to a fault, we will refund your postage.

If you wish to return your bike to us, please keep the box it arrived in and let us know using the returns form and we will arrange collection.

Customer Returns Form

If you wish to cancel, return or exchange an order please fill in the form below and a member of staff will be in contact within 48 hours to assist. Returns can be processed quicker if all required information is added.

Terms & Conditions

Items must be returned in their original packaging and be unused. Refunds will be issued once the products have been received and inspected.

Click & Collect customers can buy with confidence knowing that they can review the item before deciding whether it is right for you before leaving the store. Should you decide it's not right for you, it can be conveniently exchanged or refunded straight away, or you still have up to 90 days to return it if you are still unsure.

Please note:

1. If the items we have sent you are faulty, damaged or not as we described, we will cover the cost of collection and the delivery of the correct item.

2. If we have delivered the correct bike but upon inspection, you decide the bike is not the one for you, we will charge you £24.99 for collection. If you do not have the original box, we will charge you an additional £15 to provide one.

Refunds will be processed using the same method of payment used for the original purchase. Credit & debit card refunds must be made to the card used for the original purchase.

We are unable to offer a refund without a valid receipt.

Trek Powerfly 4 500Wh Electric Mountain Bike 2022 in Grey/Black




The Trek Powerfly 4 is Trek’s most affordable electric mountain bike. It's built with parts that hold up, like a smooth-shifting 10-speed Shimano drive train, a 500Wh battery and a powerful 250W Bosch motor that assists up to 25km/h. Plus, it features Trek’s user-friendly Removable Integrated Battery (RIB) system that's fully encased in the durable aluminium frame that doesn't require tools for removal. This bike expands your boundaries and lets you travel to destinations that you never thought you'd reach on a mountain bike.
The Powerfly 4 is perfect if you want bigger, better off-road adventures, and know that an e-MTB with the latest user-friendly tech is the best way to get them.

Key Features & Benefits:

  • Bosch Performance CX motor:Perfect for tackling the climbs.
  • Suntour XCM Fork:Dampens trail vibration for additional comfort on bumpy trails.
  • Hydraulic Disc Brakes:Reliable braking performance in all weather conditions.

Full Specification:

  • Frame: Alpha Platinum Aluminum, Removable Integrated Battery (RIB), tapered head tube, Control Freak internal routing, Motor Armor, Boost148, 12mm thru axle
  • Fork: SR Suntour XCM 34, coil spring, preload, lockout, tapered steerer, 44mm offset, Boost110, 15mm thru axle, 80mm travel
  • Motor: Bosch Performance CX, magnesium motor body, 250 watt, 85 Nm, 15.5mph or 25km/h max assist
  • Battery: Bosch PowerTube 500
  • Controller: Bosch Purion
  • Number of Gears: 10
  • Gear Shifters: Shimano Deore M4100, 10 speed
  • Chainset: FSA Bosch CK-220, 36T ring, 165mm length
  • Chainrings: 36T
  • Rear Cassette: Shimano Deore M4100, 11-46, 10 speed
  • Chain: KMC X10, 10 speed
  • Front Derailleur: N/A
  • Rear Derailleur: Shimano Deore M5120, long cage
  • Pedals: VP-536 nylon platform
  • Rims: Bontrager Connection, double-wall, 32-hole, 20mm width, presta valve
  • Front Hub: Formula DC-511, 6-bolt, Boost110, 15mm thru axle
  • Rear Hub: Bontrager alloy, sealed bearing, alloy axle, 6-bolt, Shimano 8/9/10 freehub, Boost148, 12mm thru axle
  • Front Tyre: Bontrager XR3 Comp, wire bead, 30tpi, 29x2.30"
  • Rear Tyre: Bontrager XR3 Comp, wire bead, 30tpi, 29x2.30"
  • Brakes: Tektro HD-M275 hydraulic disc, 203mm rotors
  • Handlebars: Bontrager alloy, 31.8mm, 15mm rise, 750mm width
  • Headset: FSA IS-2, 1-1/8" top, 1.5" bottom
  • Stem: Bontrager alloy, 31.8mm, Blendr compatible, 7 degree, 70mm length
  • Saddle: Bontrager Commuter Comp, 165mm width
  • Seatpost: Bontrager alloy, 31.6mm, 12mm offset, 400mm length
  • Accessories: N/A
  • Weight: M - 24.47 kg / 53.95 lbs (with tubes)

Mountain Bike Sizing Guide

Mountain Bikes tend to use the T-Shirt sizing of S, M, L etc. or will have the seat tube measurement in INCHES. Why mountain bikes are inches and road bikes are CM who knows, but the part of the frame being measured is the same.

As a rule of thumb if you can identify your size as Medium on one brand, you should use that as a starting point on another brand too.

If you already own a medium mountain bike for example and are comfortable with the sizing, start there.

What is your height? Your suggested bicycle size
Feet/Inches Centimetres Suggested Size
4'10" - 5'2" 148cm - 158cm X-Small (14-15")
5'2" - 5'6" 158cm - 168cm Small (15.5-17")
5'6" - 5'10" 168cm - 178cm Medium (17.5-18")
5'10" - 6'1" 178cm - 185cm Large (18.5-20")
6'1" - 6'4" 185cm - 193cm X-Large (20.5-22")
6'4" - 6'6" 193cm - 198cm XX-Large (22.5"+)


If you need any more advice on bike sizing for mountain bikes please contact us and we can help you make the right choice.

Technical Information

Geometry for Trek Powerfly 4 Electric Mountain Bike

All measurements provided in cm unless specified otherwise.

Trek Powerfly 4 Electric MTB Geometry Chart

Frame Size Number 14.5 15.5 17.5 19.5 21.5
Frame Size Letter XS S M L XL
A - Seat Tube 36.3 39.4 41.9 47.0 52.1
Effective Seat Tube Angle 70.0° 71.6° 71.7° 71.7° 71.7°
C - Head Tube Length 12.0 13.0 13.0 14.0 16.0
D - Head Angle 65.0° 67.6° 67.7° 67.7° 67.7°
E - Effective Top Tube 57.9 59.8 61.8 64.1 67.2
F - Bottom Bracket Height 32.8 30.7 32.4 32.4 32.4
G - Bottom Bracket Drop 3.7 4.9 4.9 5.0 5.0
H - Chainstay Length 45.5 45.5 45.5 45.5 45.5
I - Offset  5.1 4.2 5.1 5.1 5.1
J - Trail  11.4 10.1 9.8 9.8 9.8
K - Wheelbase 113.5 112.5 115.3 118.0 121.2
L - Standover 74.3 72.2 79.5 75.8 76.8
M - Frame Reach 35.2 39.0 40.6 42.7 45.2
N - Frame Stack 62.1 62.3 63.9 64.9 66.7


Sizing Information
Trek Sizing Guide
Professional Opinion
Question(s) answered about Trek Powerfly 4 500Wh Electric Mountain Bike 2022 in Grey/Black
Ask a question
Question(s) asked regarding Trek Powerfly 4 500Wh Electric Mountain Bike 2022 in Grey/Black

Ask a question

Your name
Your email address
Your phone number
Your question
Submit Question  Close
  • Is the Bosch CX motor the gen 4 or gen 2 motor?.
    Question asked by Richard on 28/06/2022 19:35:09
    THis is the latest CX motore - Bosch Performance CX, magnesium motor body, 250 watt, 85 Nm, 25 km/h (15.5 mph) as detailed in this link
  • Also in the range

    Home Mountain Biking Bikes Trek Electric Bikes

    Get £10 off your first order online*

    Sign up to our newsletter
    *£30 minimum spend. New subscribers only