Trek rail 9.8 gx axs gen 4

$7,999.93 Sale Save
Color SATIN BAJA YELLOW
Size S

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Rail 9.8 GX AXS is a long-travel carbon e-MTB that rips like our beefiest trail rigs and powers you right back up the mountain. You get upgraded everything, including the frame for maximum fun on the gnarliest runs. Boschs latest tech with smart system Performance Line CX has a longer-range 750Wh 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.
  • The new System Controller shows your currently-selected assist level and remaining battery level. Its neatly integrated into the top tube for maximum protection and a sleek look
  • Boschs new smart system gives you all the same power and responsiveness with a new discrete Mini Remote thats 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 automatically adjust the assist based on your input to give you just the right amount of power for your ride
  • The new frame is extra stout with a 34.9mm seat tube to accommodate more robust dropper posts, and an oversized head tube that works with burly e-MTB-optimized forks for less flex and more precise steering
  • Treks 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 remove the battery without tools and lets you mount a water bottle cage

Bosch Performance Line CX motor

Bosch Performance Line CX sets the standard for eMTB performance with up to 85Nm of torque and an intelligent eMTB mode with Extended Boost that automatically adjusts the amount of assist based on the terrain.

Removable Integrated Battery

RIB is a one-piece battery and cover with a built-in handle that can easily be removed and re-installed in the frame with no tools and no hassle. It’s the most convenient way to remove your battery for transport, security, or just easier charging.

Bosch Mini Remote

The compact, ergonomic Mini Remote lets you easily change assist level, activate Walk mode, or turn on optional lights, all without moving your hand off the handlebar. Plus, its wireless and connects with your System Controller via Bluetooth

Bosch System Controller

The System Controller gives you a quick overview of your assist mode and battery level without distracting you from the ride. Its integrated into the top tube so its out of the way but still easy to see with LED indicators. It also connects to the eBike Flow app via Bluetooth for accessing ride stats and performing system updates.

Active Braking Pivot

Active Braking Pivot allows our engineers to tune how the suspension reacts to acceleration and braking forces independently. That means you get more confident control when you need it most.

Bosch eBike Flow app

The new eBike Flow app turns your ride into a personalized experience. Use it to customize your motors assist behavior, track your ride stats, and integrate your data with apps like Strava and Apple Health. Theres even handy features like navigation and service reminders.


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, 34.9mm seat tube, magnesium rocker link, Motor Armor, Mino Link, ABP, Boost148, 12mm thru axle, 150mm travel
Fork RockShox ZEB Select+, DebonAir spring, Charger 3 RC2 damper, 1.8 oversized tapered steerer, eMTB optimized crown, 44mm offset, Boost110, 15mm Maxle Stealth, 160mm travel
Shock RockShox Super Deluxe Select+ RT, 230mm x 57.5mm
Wheel Front Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle, 29 /
Wheel Rear Bontrager Line Comp 30, Tubeless Ready, Rapid Drive 108, 6-bolt, Boost148, 12mm thru axle, 29
Tire 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
Tire Part Bontrager TLR sealant, 6oz
Rim Strip Bontrager TLR
Skewer Rear Bontrager Switch thru axle, removable lever
Shifter SRAM GX Eagle AXS, 12 speed
Rear Derailleur SRAM GX Eagle AXS
Crank SRAM X1 1000, 34T, 165mm length
Cassette SRAM Eagle XG-1275, 10-52, 12 speed
Chain SRAM GX Eagle, 12 speed
Chainring SRAM X-SYNC 2, 34T, alloy
Brake Rotor SRAM 6-bolt, 200mm // SRAM HS2, 6-bolt, 220mm
Pedal VP-536 nylon platform
Saddle Bontrager Arvada, austenite rails, 138mm width
Seatpost Bontrager Line Elite Dropper, 100mm travel, MaxFlow, internal routing, 34.9mm, 345mm length
Handlebar Bontrager Line Pro, OCLV Carbon, 35mm, 27.5mm rise, 780mm width
Stem Bontrager Line Pro, 35mm, Blendr compatible, 0 degree, 45mm length
Grips Bontrager XR Trail Elite, nylon lock-on
Battery Bosch PowerTube 625Wh, smart system
Controller Bosch System Controller BRC3100, smart system
Motor Bosch Performance Line CX, smart system, magnesium motor body, 85 Nm
Charger Bosch standard 4A, 110V, smart system

Geometry Chart

B B Drop 2.7
B B Height 34.6
Chainstay Length 44.7
Eff Seat Tube Angle 77.1°
Eff Top Tube 57.9
Frame Reach 43.6
Frame Size Letter S
Frame Size Number 15.5"
Frame Stack 62.5
Head Angle 64.6°
Head Tube Length 10.5
Offset 4.3
Position High
Seat Tube 41
Seat Tube Angle 71.2°
Standover 76.1
Trail 13
Wheelbase 121.3
Wheel Size 29"
B B Drop 2.7
B B Height 34.6
Chainstay Length 44.7
Eff Seat Tube Angle 77.1°
Eff Top Tube 60
Frame Reach 45.6
Frame Size Letter M
Frame Size Number 17.5"
Frame Stack 62.9
Head Angle 64.6°
Head Tube Length 11
Offset 4.3
Position High
Seat Tube 42
Seat Tube Angle 71.2°
Standover 77.3
Trail 13
Wheelbase 123.6
Wheel Size 29"
B B Drop 2.7
B B Height 34.6
Chainstay Length 44.7
Eff Seat Tube Angle 77.1°
Eff Top Tube 63.8
Frame Reach 49.1
Frame Size Letter L
Frame Size Number 19.5"
Frame Stack 64.3
Head Angle 64.6°
Head Tube Length 12.5
Offset 4.3
Position High
Seat Tube 45
Seat Tube Angle 71.2°
Standover 77
Trail 13
Wheelbase 127.7
Wheel Size 29"
B B Drop 2.7
B B Height 34.6
Chainstay Length 44.7
Eff Seat Tube Angle 77.1°
Eff Top Tube 67.1
Frame Reach 52.1
Frame Size Letter XL
Frame Size Number 21.5"
Frame Stack 65.6
Head Angle 64.6°
Head Tube Length 14
Offset 4.3
Position High
Seat Tube 50
Seat Tube Angle 71.2°
Standover 76.8
Trail 13
Wheelbase 131.3
Wheel Size 29"