Why buy your bike from Sigma Sports?
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Save up to 47% with any one of our 11 Cycle to Work partners, and get the health benefits of a new bike in exchange for tax free salary sacrifice. To find out more about our various partners and how to apply click here.
Choose between Free Bike Delivery - to your home or place of work - or our new Premier Bike Delivery Service £99.99 and have your bike delivered "ready to ride" and set up to your measurements with seatpost and pedals adjusted on arrival by a qualified bike mechanic. Either way, our Customer Care team will be in touch to arrange a delivery date to suit you.
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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 |
| 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. For hassle-free home delivery and bike set-up from a qualified mechanic use our Premier Delivery Service.
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.
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