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.
We've partnered with PedalSure to offer you 30-DAYS FREE bike insurance on new bikes over £400. Visit our Cycle Insurance page to learn more and claim.
Trek Rail 5 SX Eagle Electric Mountain Bike 2021
With an enviable list of hard-hitting, trail-ready components and an electric pedal-assist motor, Trek’s Rail 5 SX Eagle Electric Mountain Bike offers great value for money. The Bosch Performance CX, 250W motor has four power modes: Eco (60%), Tour (140%), Turbo (340%) and the intelligent eMTB (140-340%), all operated from the handlebar-mounted Bosch Purion controller and the downtube battery can be removed for recharging thanks to RIB technology.
29” wheels help the bike carry speed over rough terrain, and the Schwalbe Nobby Nic EVO tyres are tubeless-ready to help reduce punctures and improve grip. The Alpha Platinum Aluminium frame offers 150mm of travel along with Mino Link variable geometry, ABP (Active Braking Pivot) and Control Freak internal cable routing. The RockShox 35 Gold RL fork has 160mm of plush travel for when the going gets really tough, whilst 4-piston Tektro hydraulic disc brakes provide tireless stopping power. SRAM’s SX Eagle groupset takes care of shifting the chain across the very wide-range 12-speed 11-50t cassette. The final icing on the cake is the TranzX dropper seatpost that enables the saddle to be lowered on the fly on steep or technical sections for better control and confidence.
- Trek Alpha Platinum Aluminium frame with RIB, internal routing and 150mm of travel
- RockShox Deluxe RL rear shock
- RockShox 35 Gold RL fork with 160mm of travel
- SRAM SX Eagle 12-speed groupset
- Tektro HD-M745 4-piston hydraulic disc brakes
- Bontrager Tubeless Ready 29” wheels with Schwalbe Nobby Nic EVO 29x2.6” tyres
- TranzX JD-YSP18 dropper seatpost
- Bosch Performance CX 250W motor and 500Wh removable battery
|Frame||Alpha Platinum Aluminium, Removable Integrated Battery (RIB), tapered head tube, Control Freak internal routing, magnesium rocker link, Motor Armour, Mino Link, ABP, Boost148, 12mm thru-axle, 150mm travel|
|Rear Shock||RockShox Deluxe RL, 230x57.5mm|
|Fork||RockShox 35 Gold RL, DebonAir spring, Motion Control damper, e-MTB optimised, tapered steerer, 44mm offset, Boost110, 15mm Maxle Stealth, 160mm travel|
|Stem||Bontrager Rhythm Comp 31.8mm, Knock Block, 0-degree, 50mm length|
|Handlebar||Bontrager alloy, 31.8mm, 15mm rise, 750mm width|
|Front Brake||Tektro HD-M745 4-piston hydraulic disc|
|Rear Brake||Tektro HD-M745 4-piston hydraulic disc|
|Brake Levers||Tektro HD-M745 4-piston hydraulic disc|
|Rear Derailleur||SRAM SX Eagle|
|Shift Levers||SRAM SX Eagle single-click, 12-speed|
|Cassette||SRAM PG-1210 Eagle, 11-50, 12-speed|
|Crankset||SRAM X1 1000, 34T|
|Front Wheel||Bontrager sealed bearing, alloy axle, 6-bolt, Boost110, 15mm thru-axle hub with Alex MD35, Tubeless Ready, 32-hole, 35mm 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 Alex MD35, Tubeless Ready, 32-hole, 35mm width, Presta valve rim|
|Front Tyre||Schwalbe Nobby Nic EVO, SnakeSkin, TLE, 29x2.60'' clincher|
|Rear Tyre||Schwalbe Nobby Nic EVO, SnakeSkin, TLE, 29x2.60'' clincher|
|Saddle||Bontrager Arvada, steel rails, 138mm width|
|Seatpost||TranzX JD-YSP18 Dropper, internal routing, 31.6mm,|
|Battery||Bosch PowerTube, 500Wh|
|Battery Charge Time||4.5 hours (100% charge with standard charger)|
|Motor||Bosch Performance CX, 250W, 75Nm, 25kph max assist|
|Weight Limit||136kg (bike, rider and cargo)|
|Manufacturer Claimed Weight||23.53kg size medium|
Trek Rail 5 SX Eagle Electric Mountain Bike 2021 Sizing
Forgotten Your Password?
Please enter your registered email address below and we'll send you an email explaining the next step.