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Trek Powerfly FS 4 500

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Colour: Purple Flip/Trek Black

Trek Powerfly FS 4 500

The Trek Powerfly FS 4 500 is a brilliant electric trail mountain bike built with full suspension to see you comfortable on full terrain. Specifically made for rough trails, the Powerfly FS 4 is great at absorbing impact, with a powerful Bosch drive system ready to keep you boosted for miles along your epic adventures.

Who’s it for?

If you love exploring and are looking for a comfortable bike to cushion you all the way, coupled with some real leg-boosting power to get you through any climb, get a Trek Powerfly FS 4. This bike can handle rugged terrain and crush any climb in front of you.

Headline Tech:

  • Durable and lightweight aluminium frame
  • Curved top frame to make standing over your bike easier
  • 500Wh Removable Integrated Battery (RIB) system
  • Powerful Generation 4 Bosch Performance CX motor (250 W, 85Nm) capable of speeds up to 25km/h
  • SR Suntour full suspension
  • 10-speed Shimano drivetrain
  • Ergonomic Purion controller with Walk Assist
  • Dropper post lets you lower your saddle on the fly

We love it because…

This full suspension electric mountain bike crushes climbs, so you can enjoy every ride to the full. The generation 4 Bosch Performance Line CX motor really does set the bar with up to 85Nm of torque, and an Extended Boost mode that can automatically adjust the assist depending on the terrain.

In summary

The Powerfly FS 4 500 is a brilliant full suspension electric mountain bike.

A comfortable ride even on bumpy ground, this trail bike also packs a Bosch drive system ready to launch you up hills. Blended with sporty handling and efficiency, Trek have really created pure riding pleasure with this one.

Availability & Delivery:

The Trek Powerfly FS 4 500 is available with nationwide delivery options, however for the ultimate buying experience this bike is usually on display and available to test ride in our Pickering showroom.

Powerfly FS 4 500 Full Specification

  • Frame: Alpha Platinum Aluminium, Removable Integrated Battery (RIB), tapered head tube, internal routing, Motor Armour, magnesium rocker link, rack and mudguard mount, ABP, Boost148, 100 mm travel
  • Fork: SR Suntour XCR 34, air spring, LO R damper, hydraulic lockout, tapered steerer, 44 mm offset, oversized crown for eMTB, Boost110, 15 mm bolt-on thru axle, 100 mm travel (size XS, S) 120mm travel (size M, L, XL)
  • Shock: SR Suntour Edge R, 190 mm x 45 mm
  • Max compatible fork travel: 120mm (XS & S: 520mm axle-to-crown, M & up: 545mm axle-to-crown)
  • Front hub: Bontrager sealed bearing, alloy axle, 6-bolt, Boost110, 15 mm thru axle
  • Rear hub: Bontrager alloy, sealed bearing, alloy axle, 6-bolt, Shimano 8/9/10 freehub, Boost148, 12 mm thru axle
  • Skewer rear: Bontrager Switch thru-axle, removable lever
  • Rim: Alex MD35, tubeless compatible, 32-hole, 35 mm width, Presta valve
  • Tyre: Bontrager XR3 Comp, wire bead, 30 tpi, 29x2.30”
  • Max tyre size: Frame: 29x2.40" (XS & S: 27.5x2.60") Fork: See manufacturer
  • Shifter: Shimano Deore M4100, 10 speed
  • Rear derailleur: Shimano Deore M5120, long cage
  • Crank: FSA Bosch CK-220, 36T ring, 165 mm length
  • Cassette: Shimano Deore M4100, 11-46, 10-speed
  • Chain: KMC X10, 10-speed
  • Pedal: VP-536 nylon platform
  • Max chainring size: Max: 46T, Min 34T
  • Saddle: Bontrager Arvada, steel rails, 138 mm width
  • Seatpost: TranzX JD-YSP18, 100 mm travel, internal routing, 31.6 mm
  • Handlebar: Bontrager alloy, 31.8 mm, 15 mm rise, 720 mm width
  • Grips: Bontrager XR Trail Comp, nylon lock-on
  • Stem: Bontrager alloy, 31.8 mm, Blendr-compatible, 7-degree, 60mm length (size XS, S) 70mm length (size M, L, XL)
  • Brake rotor: Tektro, 6-bolt, 203 mm
  • Battery: Bosch PowerTube, vertical, 500 wh
  • Charger: Bosch compact 2A, 100–240V, smart system
  • Controller: Bosch Purion
  • Motor: Bosch Performance CX, magnesium motor body, 250 watt, 85 Nm, 25 km/h (15.5 mph) max assist
  • Weight: M - 24.83 kg / 54.75 lbs
  • Weight limit: This bike has a maximum total weight limit (combined weight of bicycle, rider and cargo) of 136 kg (300 lb).

Order your new bike from us and one of our team will hand deliver it to your home or place of work. We use a specialist 'white glove' courier trained by ourselves.

For peace of mind, every bike comes fully assembled and PDI’d by one of our Cytech mechanics – not your usual bike in a box delivery as some other shops offer.

Due to current demand for our bikes, please allow a minimum of 5-7 working days for delivery. We will call you to arrange a mutually convenient time.

Delivery Type GB Mainland (England, Scotland, Wales)

*Bikes over £2000 - Ring for cost

Click & Collect bikes of any value - FREE

Bikes less than £2000 - Ring for cost

Delivery outside of Great Britain - We do not offer delivery outside of Great Britain through this website.

Big Bear Bikes now offer a free Click & Collect service from our Pickering store for all your bike and accessory orders.

Our Click & Collect service offers all the benefits of shopping online combined with exceptional retail experience in our store. Simply order your items, select Click & Collect and pick up your item at a time that's convenient for you. Best of all the service is completely FREE!


1. Add your items to your basket

Use our website to browse our catalogue of products with stock availability. When you find the item you want, simply add it to your basket like you usually would.

2. Checkout using Click & Collect

Scroll down and choose Click & Collect as your delivery method.

3. Collect your goods

Once your order has been received, we will carefully source and prepare your goods for collection. Once ready, the store will contact you via text and/or email to confirm that the items are ready to collect. When collecting your order, you will need to bring the payment card you used to purchase the item, together with one form of photo ID – either a current driving licence or current passport.


Frequently Asked Questions

When can I collect my order?

We will notify you via email and/or text when your order is ready to collect.

If you order a bike, we will telephone you and arrange a collection appointment.

How will I know when my order is ready?

For non-bike orders we will send you an e-mail and/or text to let you know when your order is ready to collect. If you’ve ordered a bike, we will contact you by telephone once you have placed your order to arrange a collection time.

What do I need to collect my order?

Please bring with you your confirmation e-mail, the payment card you used to make the purchase and a current form of photo ID.

We will hold your order in store for 10 days. If you have any problems with getting to the store to collect your order please feel free to contact us and we will happily extend this time where possible.

How do I cancel/change my order?

If you wish to cancel your order or make any changes, please contact us on 01751 474220. Please note, full refunds will be made via the original transaction made with our online team.

How do I return my order?

Our normal returns policy applies to all Click & Collect orders - for more information see our returns policy. You can also return directly to the store.

GET UP TO 39% OFF THE COST OF YOUR NEW BIKE: HAPPY CYCLE TO WORK DAY

The UK’s Cycle To Work Scheme has been in place for over 20 years now, offering fantastic discounts to tens of thousands of riders.

The Cycle To Work Scheme, is offered through many thousands of employers in the UK and applies to bikes of all types, whether it’s road, MTB or hybrid, and that includes e-bikes too.


About the Cycle To Work Scheme

Introduced in 1999, the scheme aims to encourage employees to commute on their bike for environmental, traffic congestion and health reasons. It also enables companies to demonstrate that they’re looking after the wellbeing of their people.

Obviously, you’re supposed to use the bike for commuting – and we are massive supporters of getting to work this way – but it’s fine to buy a bike that’s built for the trails. Your employer owns the bike until you pay the final ownership fee, which is based on the “fair market value” of it at the end of that period.

As well as your new bike, you can use the scheme to buy accessories, such as helmets and bags, though these have to be ostensibly for your commute. So, no full face masks, for example. If you don’t have a lock, we strongly advise that you get one along with your bike as you’re liable for the Cycle To Work payments, even if it gets stolen while you’re paying it off.


How does the Cycle To Work Scheme work?

This is a salary sacrifice scheme for people aged 18 and over where the monthly payment for your bike is taken out before tax and National Insurance are deducted. Because your contribution is taken before tax, you pay off more per month for less. So, for a bike costing £1,200, £100 is taken from your salary every month but it only costs you £68 because the other £32 would have normally gone to the tax man, right? So, you pay 12 instalments of £68 and a final ownership fee of £300, totalling £1,116. If your salary puts you in the higher tax brackets, you actually save more but you get the gist.


I’m interested. What do I need to do?

Firstly, find out which scheme your employer is enrolled in and therefore where you can buy your bike from. We work with a number of Cycle To Work providers, including cyclescheme.co.uk, cycleplus and Bikes for the NHS.

Then you need to speak to your HR department and request a certificate, bring it to us and we’ll redeem it against the cost of your bike and accessories. The salary sacrifice commences from your next pay packet.

To get a bike on the scheme, your employer needs to sign up to a provider. If they’re unsure about how to do this, send them to us and we’ll help.


PRICE PROMISE

If you can find it cheaper - let us know!

As well as offering a fantastic range of cycling equipment, Big Bear Bikes is equally committed to offering great value.

We want you to shop with confidence, hence our simple price promise. If you are interested in any item from Big Bear Bikes, and it is in stock at a comparable UK cycle retailer at a lower price, we will match that competitor’s price.

Price Match – Terms & Conditions


  • Items must be in stock and available to all customers with a comparative retailer.
  • Only identical items (size, colour, year model, etc.) can be matched.
  • UK comparisons only.
  • We are unable to match pricing from auction sites such as eBay.
  • Comparable service conditions including delivery and fitting will be factored into the competitor’s price.
  • Product from our current range will only be matched. Price matching will not be applied to transactions involving other promotional offers, discounts, financial products (0% finance, etc.) or bike to work.
  • Repair, servicing and events cannot be price matched. Verification of the competitor’s price may be required by the Manager and the Manager’s decision is final.
  • Big Bear Bikes reserve the right to amend, withdraw or extend the offer at any time.
  • Price matching cannot be applied retrospectively.

Frame Fork Stem Handle Bars Tape/Grips Brakes Tyres Rear Derailleur Shift Levers Cassette CrankSet Pedals Front Tyre Rear Tyre Saddle Seat Post
Brand Trek
Model Year 2021
Barcodes 601842410455, 601842410462, 601842410479, 601842410486, 601842410493
SKUs / Part Numbers 1042347, 1042348, 1042349, 1042350, 1042351

Please note: Manufacturers can sometimes change the specification of the products from time to time.

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