Why buy your bike from Sigma Sports?
Don't hesitate to reach out to us. It's our goal to answer all of your questions and offer the best advice from our experts. We’ll be happy to answer any questions you may have. Contact us now or visit us in-store.
All our bikes are fully built by our Cytech qualified mechanics. To find out more, see the Built, Checked, Tuned and Tested section below to see how we'll deliver your bike.
We offer FREE DELIVERY of your bike to your home or place of work. Once you've placed your order, our Customer Care team will be in contact to offer a convenient delivery date of your choice.
We've partnered with Pedalsure to offer you 30-DAYS FREE bike insurance on new bikes over £400. Visit our Cycle Insurance page to learn more and claim.
Trek Powerfly FS 4 500 WH Electric Mountain Bike 2022
Take your off-road adventures further with the Trek Powerfly FS 4 500 WH Electric Mountain Bike, a sturdy aluminium steed complete with 250W of assistance at up to 15.5 mph / 25 km/h courtesy of the Bosch Performance CX motor, ideal for providing an extra push on climbs so no route is off-limits. This compact Bosch PowerTube 500 completes a full charge in around four and a half hours and is integrated into the frame for a sleek look, boasting simple, intuitive removal without the need for tools.
A plush suspension set up with 100mm of travel to the rear and 120mm of front suspension means this bike is more than comfortable on rugged terrain, soaking up bumps for a delightfully smooth ride over any roots or rocks the trail may throw at you, and it features a hydraulic lockout which comes in handy to stop any bobbing up climbs. The Shimano Deore 10-speed drivetrain is always ready for some hard labour, delivering reliable shifting and a range of gears to suit undulating topography, whilst the TranzX dropper seatpost comes in handy to get weight low over the back wheel when sending it downhill. Stopping is stress-free and tackled with precision thanks to the Tektro HD-M275 hydraulic disc brakes, which perform in adverse weather and testing conditions alike.
Browse our range of Trek electric mountain bikes today.
- Max Assist: 250w
- Motor Weight: 2.9kg
- Battery Power: Approximately 500Wh
- Charge Time: 100% charge, 4.5 hours with Standard Charger
- Trek Alpha Platinum Aluminium frame with RIB
- SR Suntour XCR 34, air spring fork with 120mm travel
- Shimano Deore 10-speed components
- Tektro HD-M275 hydraulic disc brakes
- Bontrager wheels with 2.30” XR3 Comp tyres
- TranzX JD-YSP18 dropper seatpost gets the saddle out of the way quickly
- Bosch Performance CX 250W motor
- Bosch PowerTube 500 battery
|Frame||Trek Alpha Platinum Aluminium, Removable Integrated Battery (RIB), tapered head tube, Knock Block, internal routing, Motor Armor, magnesium rocker link, rack and mudguard mount, ABP, Boost148, 100mm of travel|
|Fork||SR Suntour XCR 34, air spring, LO R damper, hydraulic lockout, tapered steerer, 44mm offset, oversized crown for eMTB, Boost110, 15mm bolt-on thru axle, 120mm of travel|
|Rear Shock||SR Suntour Edge R, 190x45mm|
|Stem||Bontrager alloy, 31.8mm, Blendr compatible, 7 degree|
|Handlebar||Bontrager alloy, 31.8mm, 15mm rise|
|Grips||Bontrager XR Trail Comp, nylon lock-on|
|Front Brake||Tektro HD-M275 hydraulic disc|
|Rear Brake||Tektro HD-M275 hydraulic disc|
|Brake Levers||Tektro HD-M275|
|Rear Derailleur||Shimano Deore M5120, long cage|
|Shift Levers||Shimano Deore M4100, 10-speed|
|Chain||KMC X10, 10-speed|
|Cassette||Shimano Deore M4100, 11-46, 10-speed|
|Crankset||FSA Bosch CK-220, 36T ring, 165mm length|
|Front Wheel||Bontrager sealed bearing, alloy axle, 6-bolt, Boost110, 15mm thru-axle hub, Alex MD35, Tubeless Ready, 32-hole, 35mm width, presta valve rim|
|Rear Wheel||Bontrager alloy, sealed bearing, alloy axle, 6-bolt, Shimano 8/9/10 freehub, Boost148, 12mm thru-axle hub, Alex MD35, Tubeless Ready, 32-hole, 35mm width, presta valve rim|
|Front Tyre||Bontrager XR3 Comp, wire bead, 30tpi, 29x2.30" clincher|
|Rear Tyre||Bontrager XR3 Comp, wire bead, 30tpi, 29x2.30" clincher|
|Saddle||Bontrager Arvada, steel rails, 138mm width|
|Seatpost||TranzX JD-YSP18 dropper, internal routing, 31.6mm|
|Pedals||VP-536 nylon platform|
|Charge time||100% charge, 4.5 hours with Standard Charger|
|Motor||Bosch Performance CX, magnesium motor body, 250 watt, 85 Nm, 25km/h|
|Battery||Bosch PowerTube 500|
|Charger||Bosch standard 4A (220-240 V) charger|
|Electric assisted speed limit||15.5 mph / 25 km/h|
Built, Checked, Tuned and Tested
All our bikes are fully built, checked, tuned and tested by our Cytech qualified mechanics and then securely packaged, ready for delivery. All you have to do is add the pedals (if included), attach the handlebars to the stem and tighten them following the included detailed instructions or by watching our video and using the provided FREE tools. Visit our Bike Assembly page to see how you assemble your new bike once you receive it.
All bikes collected from our shop, are built, tested and ready to ride.
Please note, occasionally, manufacturers may change the specification without notice. Bicycles do not come with pedals unless otherwise specified. Bikes ordered for delivery will not arrive with the pedals installed, please refer to the owners manual and pedal installation guides provided for guidance. We do not install accessories to bikes, including mudguards. Bikes ordered for delivery that have tubeless compatible tyres and rims will arrive with inner tubes installed or with tubeless valves installed, this will be brand dependent. Sealant is available to be purchased separately.
If you require any assistance please contact our Customer Care team.