2024 Trek Rail 9.8 XT Gen 4 Electric Mountain Bike

£7,883.75
Was £9,275.00

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The 2024 Trek Rail 9.8 XT Gen 4 Electric Mountain Bike is a long-travel carbon e-MTB. You get upgraded everything, including the frame for maximum fun on the gnarliest runs. You also get Bosch’s latest tech with the smart system Performance Line CX that has a longer-range 750 Wh battery and cool features that take your ride to the next level like activity tracking, navigation and Bluetooth connectivity. The new System Controller sits almost flush for a sleek look and Mini Remote is discreet and intuitive.

An upgraded OCLV Mountain Carbon frame with longer reach and oversized head tube and seat tube for maximum strength. An extra-long-range 750 Wh battery, a super responsive RockShox ZEB Select+ fork and RockShox Super Deluxe Ultimate Thru Shaft shock with a Shimano XT 1x12 drivetrain. You get the latest from Bosch with smart system Performance Line CX, including the new Mini Remote and Bluetooth System Controller display that’s integrated into the top tube.


This bike is perfect for

Mountain bikers looking for a long-travel carbon e-MTB with high-performance parts and a lot of battery power. You crave the responsiveness of carbon, the stability of a longer reach, the plush feel of high-end suspension and want the very latest from Bosch.



Key Features
  • The Carbon Rail Gen 4 has the same enduro-inspired geometry and huge battery as the previous generation, but now it has a pocket in the top tube that makes Gen 4 compatible with Bosch’s integrated System Controller and Mini Remote
  • The System Controller shows your currently-selected assist level and remaining battery level. It’s neatly integrated into the top tube for maximum protection and a sleek look.
  • Bosch's smart system gives you all the same power and responsiveness with a new discrete Mini Remote that's streamlined with just the controls you need at your fingertips to toggle through assist levels or change to walk mode
  • Intelligent eMTB and eMTB Lite modes adjust the assist automatically based on your input to give you just the right amount of power for your ride
  • The new frame is extra stout with a 34.9 mm seat tube to accommodate more robust dropper posts, and an oversized head tube that works with burly e-MTB-optimised forks for less flex and more precise steering

Electric Bike Updates and Diagnostics

As electric bikes have become more sophisticated it’s important to stay on top of updates. Just like your home computer or smart phone regular updates are now released for most electric bike systems. If you buy a bike from Cycles UK we will do electric bike updates and diagnostics you need free of charge.

Electric Bike Updates

Electric bike updates can help to improve battery life, tweak how the motor works and fix bugs and problems. Most systems will require you to plug your bike into some specialist software at an authorised dealer. At Cycles UK we are authorised dealers for top electric bike brands including Specialized, Trek, Orbea, Whyte, Cannondale and Raleigh. As a result our stores have the software and hardware to run updates on all the major electric bike systems including Bosch, Shimano and Ebikemotion.

Free Electric Bike Updates and Diagnostics

We now provide free updates and diagnostics for life on any electric bike purchased from Cycles UK.

Electric Bike Motors Explained

Electric bikes have really come into their own in the last couple of years. Thanks to advances in electric bike motors and batteries. A couple of bike manufacturers, most notably Specialized, are making their own electric bike motors. The vast majority of bike companies are using the same motors. So, you will find exactly the same electric motor being used on bikes from different brands and at different price points. In this guide, we’ll take you through the main types of electric bike motors. Look at the differences between the most commonly used brands.

Electric Bike Hub Motors vs Mid-Drive Motors

Electric bikes tend to either come with a hub motor or a mid-drive motor. Mid-drive motors sit where the cranks and bottom bracket are on a bike and drive the cranks and chain around. Hub drive motors sit in the middle of the wheel and drive the wheel directly. Hub drive electric bikes are cheaper but less efficient, and less smooth, to ride.


Read our guide to electric bike motors

Trek Electric Bike Range Guide

The Trek electric bike range has been pretty enormous at times. This has mainly been due to a single model of bike being available in multiple battery and colour variations so you quickly ended up with dozens of variants. Thankfully Trek have scaled this back a little recently, and their electric bike range is now easier to understand.

Until recently nearly all Trek electric bikes came with Bosch motors. For the 2023 season they are continuing with Bosch but also introducing motors from new brands like TQ and Hydrive on selected models.

Read our full Trek electric bike range guide

Price Match at Cycles uk

We understand that price is important, so we regularly price-check our competitors to make sure we have the best offers available. We recognise that we will not always be the cheapest, so if you see the same product cheaper from any of our competitors then please get in touch via the form below and we will do our best to match any reasonable advertised price.

Trek made their first bikes in 1976 in a barn in Wisconsin. Now they’re one of the biggest bike brands in the world. Trek bikes cover everything from professional-level road and mountain bike race bikes to commuters, hybrids and kids bikes. There is a strong heritage of racing at Trek and many Trek bikes have a strong race influence. They take a very scientific approach to researching bike and human performance and then make the fastest and most efficient bikes they can.

It doesn’t stop their attention and passion for cycling flows through everything they do. Since the 1990s, Trek has supported Places for Bikes. Places for Bikes is an advocacy organisation in the USA that gets more people on bikes more often! Places for Bikes ethos falls in line with the companies mission statement to:

Build only products we love. Provide incredible hospitality to our customers, and change the world by getting more people on bikes.

Frame - OCLV Mountain Carbon main frame, 1.8'' lower head tube, Bosch System Controller-compatible, Removable Integrated Battery (RIB), Knock Block 2.0, guided internal routing, 34.9 mm seat tube, magnesium rocker link, Motor Armour, Mino Link, ABP, Boost148, 12 mm thru-axle, 150 mm travel

Fork - RockShox ZEB Select+, DebonAir spring, Charger 3 RC2 damper, 1.8" oversized tapered steerer, eMTB optimised crown, 44 mm offset, Boost110, 15 mm Maxle Stealth, 160 mm travel

Shock - RockShox Super Deluxe Select+ RT, 230 mm x 57.5 mm

Wheel front - Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15 mm thru axle

Wheel rear - Bontrager Line Comp 30, Tubeless-Ready, Rapid Drive 108, 6-bolt, Boost148, 12 mm thru axle

Skewer rear - Bontrager Switch thru-axle, removable lever

Tyre - Bontrager SE5 Team Issue, Tubeless Ready, Core Strength sidewalls, aramid bead, 120 tpi, 29x2.50". Bontrager SE6 Team Issue, Tubeless Ready, Core Strength sidewalls, aramid bead, 120 tpi, 29x2.50"

Tyre part - Bontrager TLR sealant, 180 ml/6 oz

Rim strip - Bontrager TLR

Shifter - Shimano XT M8100, 12-speed

Rear derailleur - Shimano XT M8100, long cage

Crank - E*thirteen E*spec Plus, 165 mm length

Chainring - E*thirteen E*spec, 34T alloy, 55 mm chainline

Cassette - Shimano XT M8100, 10-51, 12-speed

Chain - Shimano XT M8100, 12-speed

Pedal - VP-536 nylon platform

Saddle - Bontrager Arvada, austenite rails, 138 mm width

Seatpost - Bontrager Line Elite Dropper

Handlebar - Bontrager Line Pro, OCLV Carbon, 35 mm, 27.5 mm rise, 780 mm width

Grips - Bontrager XR Trail Elite, nylon lock-on

Stem - Bontrager Line Pro, 35 mm, Knock Block, Blendr-compatible, 0-degree, 45 mm length

Brake - Shimano XT M8120 4-piston hydraulic disc

Brake rotor - Shimano RT76, 6-bolt, 203 mm

Battery - Size: S Bosch PowerTube 625Wh, smart system. Size: M, L, XL Bosch PowerTube 750Wh, smart system

Charger - Bosch standard 4A, 230V, smart system

Controller - Bosch System Controller BRC3100, smart system

Motor - Bosch Performance Line CX, smart system, magnesium motor body, 85 Nm

Weight - Medium size – 23.75 kg/52.36 lbs

Weight limit - This bike has a maximum total weight limit (combined weight of bicycle, rider and cargo) of 136 kg (300 lb).

Colours DEEP SMOKE, LAVA, SATIN BAJA YELLOW
Sizes L, M, S, XL
Brand Trek
Model Year 2024
Barcodes 601842782255, 601842782262, 601842782279, 601842782286, 601842782293, 601842782309, 601842782316, 601842782323, 601842782330, 601842782347, 601842782354, 601842782361
SKUs / Part Numbers 5278512, 5278513, 5278514, 5278515, 5278516, 5278517, 5278518, 5278519, 5278520, 5278521, 5278522, 5278523

Please note: Manufacturers can sometimes change the specification of the products from time to time.

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