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 4 625w Gen 4 Electric Mountain Bike
Embrace the e-bike revolution without breaking the bank with our versatile and capable e-MTB. Designed for adventurers seeking bigger and better off-road experiences, this model boasts a tough yet refined aluminum frame housing a long-range 625 Wh battery and a powerful Bosch Performance Line CX motor. With assistance up to 20 mph, Shimano 1x10 drivetrain, and suspension fork with lockout, you're geared for any terrain. Smart Wheel Sizing ensures an optimal fit for every rider. Compared to the standard Powerfly 4, this model offers an extended range battery, guaranteeing endless fun. Trek's Removable Integrated Battery (RIB) system ensures sleek aesthetics and user-friendly operation, while the Intuvia controller provides convenient features like Walk Assist and intelligent e-MTB mode. Equipped with an external charging port and adaptable utility options including racks and mudguards, this e-MTB is ready for all your adventures, whether commuting or conquering the trails.
Technical Specification
| Frame Size | XS, S |
| Size | M, L, XL Alpha Platinum Aluminium, Removable Integrated Battery (RIB), tapered head tube, Control Freak internal routing, Motor Armour, Boost148, 12 mm thru axle |
| Fork Size | XS |
| Size S, M, L, XL | SR Suntour XCM 34, coil spring, preload, lockout, tapered steerer, 44 mm offset, Boost110, 15 mm thru axle, 120 mm travel |
| Max compatible fork travel | 120mm (526mm axle-to-crown), XS |
| Hub front | Formula DC-511, 6-bolt, Boost110, 15 mm thru axle |
| Hub rear | Bontrager alloy, sealed bearing, alloy axle, 6-bolt, Shimano 8/9/10 freehub, Boost148, 12 mm thru axle |
| Skewer rear | Bontrager Switch thru-axle, removable lever |
| Rim | Bontrager Connection, double-wall, 32-hole, 20 mm width, Presta valve |
| Tyre Size | XS, S Bontrager XR3 Comp, wire bead, 30 tpi, 27.5x2.35" |
| Size | M, L, XL Bontrager XR3 Comp, wire bead, 30 tpi, 29x2.30" |
| Max tyre size | Frame 29x2.60" or 27.5x2.80" (XS & S |
| Battery | Bosch PowerTube 625Wh, smart system |
| Charger | Bosch standard 2A, 230V, smart system |
| Controller | Bosch Intuvia 100, smart system |
| Computer | Bosch LED remote, smart system |
| Motor | Bosch Performance Line CX, smart system, magnesium motor body, 85 Nm |
| Shifter | Shimano Deore M4100, 10 speed |
| Rear derailleur | Shimano Deore M5120, long cage |
| Crank | FSA Bosch CK-220, 36T ring, 165 mm length |
| Chainring | FSA, 36T, steel |
| Cassette | Shimano Deore M4100, 11-46, 10-speed |
| Chain | KMC X10, 10-speed |
| Pedal | VP-536 nylon platform |
| Max. chainring size | 1x |
| Saddle | Bontrager Commuter Comp |
| Seatpost Size | XS, S Bontrager alloy, 31.6 mm, 12 mm offset, 330 mm length |
| Size | M Bontrager alloy, 31.6 mm, 12 mm offset, 360 mm length |
| Size | L, XL Bontrager alloy, 31.6 mm, 12 mm offset, 400 mm length |
| Handlebar Size XS, S | Bontrager alloy, 31.8 mm, 15 mm rise, 720 mm width |
| Size M, L, XL | Bontrager alloy, 31.8 mm, 15 mm rise, 750 mm width |
| Grips | Bontrager XR Endurance Comp, lock-on |
| Stem Size XS | Bontrager Comp, 31.8 mm, Blendr compatible, 7-degree, 50 mm length |
| Size S, M | Bontrager Comp, 31.8 mm, Blendr compatible, 7-degree, 60 mm length |
| Size L, XL | Bontrager Comp, 31.8 mm, Blendr compatible, 7-degree, 70 mm length |
| Headset | FSA IS-2, 1-1/8" top, 1.5" bottom |
| Brake rotor | Tektro, 6-bolt, 203 mm |
| Brake Set | Tektro HD-M275 hydraulic disc |
| Rotor size | Max brake rotor sizes - Frame |
| Weight | M - 24.53 kg / 54.08 lbs |
| Weight limit | This bike has a maximum total weight limit (combined weight of bicycle, rider and cargo) of 136 kg (300 lb). |
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.
Trek Powerfly 4 625w Gen 4 Electric Mountain Bike Sizing
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