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.
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.
We've partnered with Laka to offer you 30 days free bike Insurance on your new bike purchase over £400. Click here for more info and find out how to claim.
Trek Powerfly Sport 4 Electric Mountain Bike 2020
With the Trek Powerfly Sport 4 Electric Mountain Bike, you can chew up the trails or cruise to work in comfort. The aluminium frame is a strong basis to hold the powerful 250 Watt Bosch motor and long-range 500 Wh battery. The battery can be removed for charging, or simply plug the bike in using the external port.
Powerful hydraulic disc brakes provide all the stopping power you'll need in any weather, while the gearset has a wide range suited to any terrain. With mudguards and a rear rack included along with front and rear lights, you're ready for adventure straight out of the box.
Highlights
- Trek's Removable Integrated Battery (RIB) system looks great and is super user-friendly: it fully hides the battery in the frame for protection, makes it easy to remove the battery without tools and lets you mount a water bottle cage
- This bike expands boundaries: the top-notch Bosch system is equally suited to commuting, recreation and a ridiculously fun time on the trails
- The Purion controller has Walk Assist and an intelligent eMTB mode that automatically delivers the right amount of power based on your terrain
- Equipped with an external charging port for easy charging on or off the bike
- It comes equipped with lights, mudguards and a rear rack so you're ready to ride right from the start
Technical Specification
| FRAME | Trek Alpha Platinum Aluminium, Removable Integrated Battery (RIB), tapered head tube, Control Freak internal routing, Motor Armour, Boost148, 12mm thru-axle |
| FORK | SR Suntour XCM 34, coil spring, preload, lockout, tapered steerer, 44 mm offset, Boost110, 15 mm thru-axle, 120 mm travel |
| STEM | Bontrager alloy, 31.8 mm, Blendr-compatible, 7-degree |
| HANDLEBAR | Bontrager alloy, 31.8mm, 15mm rise |
| FRONT BRAKE | Tektro HD-M275 hydraulic disc |
| REAR BRAKE | Tektro HD-M275 hydraulic disc |
| FRONT DERAILLEUR | N/A |
| REAR DERAILLEUR | Shimano Acera M3000, Shadow design, long cage |
| SHIFT LEVERS | Shimano Altus M2000, 9-speed |
| CASSETTE | Shimano HG200, 11-36t, 9-speed |
| CRANKSET | FSA 310, 36T with chainguard |
| FRONT WHEEL | Formula DC-511, 6-bolt, Boost110, 15 mm thru-axle hub | Bontrager Connection, double-wall, 32-hole, 20 mm width, Presta valve clincher rim |
| REAR WHEEL | Bontrager alloy, sealed bearing, alloy axle, 6-bolt, Shimano 8/9/10 freehub, Boost148, 12 mm thru-axle | Bontrager Connection, double-wall, 32-hole, 20 mm width, Presta valve clincher rim |
| FRONT TYRE | Schwalbe Smart Sam Performance, 29x2.25" clincher |
| REAR TYRE | Schwalbe Smart Sam Performance, 29x2.25" clincher |
| SADDLE | Bontrager Commuter Comp, 165mm width |
| SEATPOST | Bontrager alloy, 31.6 mm, 12mm offset |
| BATTERY | Bosch PowerTube, vertical, 500wh |
| CONTROLLER | Bosch Purion |
| MOTOR | Bosch Performance CX, 250 Watt, 75 Nm, 25 km/h max assist |
| MANUFACTURER'S CLAIMED WEIGHT | 22.67kg (size M) |
| ACCESSORIES | Mudguards, rear rack, VP-536 nylon platform pedals, AXA Compact Line 35front light, AXA Blueline rear light |
| 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.
Unable to display Reviews due to Privacy Settings.
Adjust your Cookie Preferences to Opt-in "YES" to "Functional Cookies".
Unable to display Q&A due to Privacy Settings.
Adjust your Cookie Preferences to Opt-in "YES" to "Functional Cookies".