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 Electric Mountain Bike 2020
The Trek Powerfly 4 Electric Mountain Bike combines a rugged aluminium frame with an SR Suntour XCM 34 suspension fork with 120mm of travel and a 250W Bosch Performance CX motor for great fun off-road. With for modes of assistance ranging from 60% extra power to 340%, there is always the extra assistance required easily available. The 500Wh battery is integrated into the downtube, but can be simply removed for recharging if there is no power source nearby.
Tektro HD-M275 hydraulic disc brakes provide great all-weather stopping power with just a light squeeze of the lever required and the 9-speed Shimano groupset gives crisp shifts across the whole cassette. The wheels are from Bontrager and are size-specific, with the small sizes utilising 27.5” wheels and the larger sizes 29” for better handling across the size range.
Highlights
- Trek Alpha Platinum Aluminium frame with RIB
- SR Suntour XCM 34 fork with 120mm of travel
- Shimano Altus 9-speed groupset
- Tektro HD-M275 hydraulic disc brakes
- Size-specific Bontrager wheels with 2.35” tyres
- Bosch Performance CX 250W motor and 500Wh removable battery
Technical Specification
| FRAME | Trek Alpha Platinum Aluminium, Removable Integrated Battery (RIB), tapered head tube, Control Freak internal routing, Motor Armor, Boost148 |
| FORK | SR Suntour XCM 34, coil spring, preload, lockout, tapered steerer, 44mm offset, Boost110, 15mm thru-axle, 120mm travel |
| STEM | Bontrager alloy, 31.8mm, 7 degree |
| HANDLEBAR | Bontrager alloy, 31.8mm, 15mm rise |
| FRONT BRAKE | Tektro HD-M275 hydraulic disc |
| REAR BRAKE | Tektro HD-M275 hydraulic disc |
| BRAKE LEVERS | Tektro HD-M275 hydraulic disc |
| FRONT DERAILLEUR | N/A |
| REAR DERAILLEUR | Shimano Acera M3000, Shadow design, long cage |
| SHIFT LEVERS | Shimano Altus M2010, 9-speed |
| CASSETTE | Shimano HG200, 11-36, 9-speed |
| CRANKSET | FSA 310, 15t with chain guard, |
| FRONT WHEEL | Formula DC-511, 6-bolt, Boost110, 15mm thru-axle hub with 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 with Bontrager Connection, double-wall, 32 hole, 20mm width, Presta valve rim |
| FRONT TYRE | Bontrager XR3 Team Issue, Tubeless Ready, Inner Strength sidewall, aramid bead, 120 tpi, 2.35 clincher (27.5” S / 29” M, L, XL) |
| REAR TYRE | Bontrager XR3 Team Issue, Tubeless Ready, Inner Strength sidewall, aramid bead, 120 tpi, 2.35 clincher (27.5” XS, S / 29” M, L) |
| SADDLE | Bontrager Arvada, steel rails, 138mm width |
| SEATPOST | Bontrager alloy 31.6mm |
| BATTERY | Bosch PowerTube, 500Wh |
| CONTROLLER | Bosch Purion |
| MOTOR | Bosch Performance CX, 250W, 75Nm, 25kph max assist |
| WEIGHT LIMIT | 136kg (bike, rider and cargo) |
| MANUFACTURER CLAIMED WEIGHT | 24.47kg size medium |