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.
Cyclescheme can save you up to 39% on a bike and accessories. Visit our Cycle to Work Scheme page to learn more and claim.
Trek PowerFly 4 500WH Electric Mountain Bike 2021
Featuring a burly aluminium frame and reliable components, the Trek Powerfly 4 500WH Electric Mountain Bike is a capable entry-level steed ideal for leisure rides, a commute with a kick and tackling trails. The Bosch Performance CX motor comes into play to support up to 25km/h and 250w, so tough climbs are made that bit more manageable, and the Bosch PowerTube 500 watt-hour battery completes a full charge in four and a half hours should a ride be on the cards later in the day. This battery is concealed within the frame to keep it in top condition and maintain a sharp silhouette, and thanks to the RIB (removable Integrated Battery) system can be removed intuitively with no tools required.
The SR Suntour XCM 34 suspension fork with 80mm of travel smooths surfaces whilst remaining responsive, and can be locked out to diminish unnecessary bobbing when riding uphill or on roads. 1x10-speed Shimano Deore components handle shifting duties with reliable precision, providing enough gears to spin over undulating terrain, and Tektro HD-M275 hydraulic disc brakes ensure firm stopping power unaffected by conditions or terrain.
- Trek Alpha Platinum Aluminium frame with RIB
- SR Suntour XCM 34 fork with 80mm of travel
- Shimano Deore 1x10-speed drivetrain
- Tektro hydraulic disc brakes
- 29” wheels with 2.30” tyres
- Bosch Performance CX 250W motor
- Bosch PowerTube 500 battery
|Frame||Trek Alpha Platinum Aluminium, 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|
|Headset||FSA IS-2, 1-1/8" top, 1.5" bottom|
|Stem||Bontrager alloy, 31.8mm, Blendr compatible, 7 degree, 70mm length|
|Handlebar||Bontrager alloy, 31.8mm, 15mm rise, 750mm width|
|Grips||Bontrager XR Endurance Comp, lock-on|
|Front Brake||Tektro HD-M275 hydraulic disc, 203mm rotors|
|Rear Brake||Tektro HD-M275 hydraulic disc, 203mm rotors|
|Brake Levers||Tektro HD-M275 hydraulic disc|
|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||Formula DC-511, 6-bolt, Boost110, 15mm thru-axle hub, Bontrager Connection, double-wall, 32-hole, 20mm width, Presta valve rim|
|Rear Wheel||Bontrager alloy, sealed bearing, alloy axle, 6-bolt, Shimano 8/9/10 freehub, Boost148, 12mm thru-axle hub, Bontrager Connection, double-wall, 32-hole, 20mm 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 Commuter Comp, 165mm width|
|Seatpost||Bontrager alloy, 31.6mm, 12mm offset, 400mm length|
|Pedals||Trek VP-536 nylon platform|
|Claimed Manufacturers Weight||Size M - 23.67kg / 52.18lbs (with tubes)|
|Charge time||100% charge, 4.5 hours with Standard Charger|
|Motor||Bosch Performance CX, magnesium motor body, 250 watt, 75 Nm, 20mph or 32km/h max assist|
|Battery||Bosch PowerTube 500|
|Charger||Bosch compact 2A (100-240 V) charger|