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You’re looking for a long-travel carbon e-MTB and you want nothing but the best. Your bike better have wireless electronic components, a high-end suspension setup, and a powerful Bosch system that’ll fly up grinders in a flash.

The tech you get

An OCLV Mountain Carbon frame that fully encases a 625Wh battery, a super responsive RockShox ZEB Ultimate fork with extra-burly 38mm stanchions and loads of adjustability, a RockShox Super Deluxe Ultimate shock with an updated Thru Shaft damper, a Bosch Performance Line CX 250W motor that assists up to 20 mph, and a Kiox controller. A SRAM X01 Eagle AXS drivetrain with an extra-low 52-tooth climbing gear, downhill-rated 4-piston brakes for unflinching descents, a RockShox Reverb AXS dropper post, and new Bontrager Line Pro 30 carbon wheels with robust SE5 Team Issue tires that come completely tubeless ready, including sealant.

The final word

Rail 9.9 is all about top-shelf tech. It has the latest wireless electronic components, RockShox's best enduro fork, and Bosch's most powerful battery and full-color controller.

See it in action

favorite_borderWhy you'll love it

  1. The SRAM X01 Eagle AXS drivetrain is smart, smooth, and completely wireless
  2. The full-color Bosch Kiox controller displays ride info, connects with your Bluetooth® enabled devices, and has a built-in theft prevention feature
  3. The new, better-than-ever Bosch motor is smaller, lighter, and more efficient. It feels more natural while you’re pedaling, and has less drag when you’re not
  4. RE:aktiv with Thru Shaft works faster than a normal shock, so it tracks the ground better and keeps you in control
  5. 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 remove the battery without tools and lets you mount a water bottle cage

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Features

New Bosch Performance Line CX

New Bosch Performance Line CX

The all-new Bosch Performance Line CX motor is lighter, smaller, and quieter than previous versions, for cleaner integration and more nimble handling. It's also more efficient so you can go farther on a single battery charge. Use the intelligent eMTB mode to automatically adjust the amount of assist to match the terrain. It's a set-and-forget mode that delivers just the right amount of power so you can focus on enjoying the ride.

Custom eMTB Lite mode

Custom eMTB Lite mode

Trek eMTBs feature a custom eMTB Lite mode in place of Tour mode. It gives you more natural-feeling power delivery and longer battery life.

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.

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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.

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OCLV Mountain Carbon

Trek's mountain-specific carbon fiber is tougher carbon, with unique materials and layup procedures, Trek's advanced engineering, and a higher standard of testing.

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RockShox Super Deluxe Thru Shaft damper

With the all-new RockShox Super Deluxe Ultimate Thru Shaft, you get the most refined shock on the market, with an updated air spring and an exclusive Thru Shaft damper that gives you tenacious grip, plush control, and the support you need for ripping rough descents all day.

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Specifications

  • Frameset

    Frame
    OCLV Mountain Carbon main frame & stays, Removable Integrated Battery (RIB), tapered head tube, Knock Block, Control Freak internal routing, magnesium rocker link, Motor Armor, Mino Link, ABP, Boost148, 12mm thru axle, 150mm travel
    Fork
    RockShox ZEB Ultimate, DebonAir spring, Charger 2.1 RC2 damper, e-MTB optimized crown, tapered steerer, 44mm offset, Boost110, 15mm Maxle Stealth, 160mm travel
    Rear suspension
    NEW RockShox Super Deluxe Ultimate RT3, DebonAir spring, Thru Shaft 3-position damper, 230x57.5mm
  • Wheels

    Wheels
    NEW Bontrager Line Pro 30, OCLV Mountain Carbon, Tubeless Ready, 6-bolt, Boost110 front, Boost148 rear
    Tires
    Bontrager SE5 Team Issue, Tubeless Ready, Core Strength sidewall, aramid bead, 60 tpi, 29x2.60"
  • Drivetrain

    Shifters
    SRAM Eagle AXS, wireless, 12-speed
    Rear derailleur
    SRAM X01 Eagle AXS
    Crank
    E*thirteen E*spec Race carbon, 34T
    Cassette
    SRAM XG-1295 Eagle, 10-52, 12 speed
    Chain
    SRAM XX1 Eagle, 12 speed
    Pedals
    VP-536 nylon platform
  • Components

    Saddle
    Bontrager Arvada, austenite rails, 138mm width
    Seatpost
    RockShox Reverb AXS, wireless, 31.6mm
    Handlebar
    Bontrager Line Pro, OCLV Carbon, 35mm, 27.5mm rise
    Grips
    Bontrager XR Trail Elite, alloy lock-on
    Stem
    Bontrager Line Pro, 35mm, Knock Block, Blendr compatible, 0 degree
    Headset
    Knock Block Integrated, 58-degree radius, cartridge bearing, 1-1/8" top, 1.5" bottom
    Brakeset
    SRAM Code RSC hydraulic disc
  • Accessories

    Battery
    Bosch PowerTube 625
    Controller
    Bosch Kiox with Anti-theft solution
    Motor
    Bosch Performance CX, magnesium motor body, 250 watt, 75 Nm, 20mph or 32km/h max assist
  • Weight

    Weight
    M - 22.47 kg / 49.54 lbs (with tubes)
    Weight limit
    This bike has a maximum total weight limit (combined weight of bicycle, rider, and cargo) of 300 pounds (136 kg).
We reserve the right to make changes to the product information contained on this site at any time without notice, including with respect to equipment, specifications, models, colors, and materials.
Bike and frame weights are based off Trek pre-production painted frames at time of publication. Weights may vary in final production.

Sizing & fit

The charts below show our recommended sizes based on height, but there are some other factors, like arm and leg length, that determine a great fit. That’s why you’ll see some overlap in our recommendations. Not every rider who’s 5´8˝, for example, will fit on the same size bike. The best way to find your perfect fit is to consult the experts at your local Trek retailer.

 

Rider Height

Inseam

All measurements provided in cm unless otherwise noted.

Frame size number Frame size letter Geometry position Wheel size A — Seat tube Effective seat tube angle C — Head tube length D — Head angle E — Effective top tube F — Bottom bracket height G — Bottom bracket drop H — Chainstay length I — Offset J — Trail K — Wheelbase L — Standover M — Frame reach N — Frame stack Stem length
15.5 S High 29" 41.0 75.0° 10.5 64.9° 58.7 34.4 2.9 44.7 4.3 12.7 119.5 75.8 42.5 62.3 4.0
15.5 S Low 29" 41.0 75.0° 10.5 64.5° 58.8 33.9 3.5 44.8 4.3 13.1 119.6 75.3 42.0 62.6 4.0
17.5 M High 29" 42.0 75.0° 10.5 64.9° 61.1 34.4 2.9 44.7 4.3 12.7 122.0 77.0 45.0 62.2 5.0
17.5 M Low 29" 42.0 75.0° 10.5 64.5° 61.3 33.9 3.5 44.8 4.3 13.1 122.1 76.5 44.5 62.6 5.0
19.5 L High 29" 45.0 75.0° 11 64.9° 63.3 34.4 2.9 44.7 4.3 12.7 124.3 76.7 47.0 62.7 5.0
19.5 L Low 29" 45.0 75.0° 11.0 64.5° 63.4 33.9 3.5 44.8 4.3 13.1 124.3 76.2 46.5 63.0 5.0
21.5 XL High 29" 50.0 75.0° 12.0 64.9° 66.5 34.4 2.9 44.7 4.3 12.7 127.7 76.5 49.9 63.6 5.0
21.5 XL Low 29" 50.0 75.0° 12.0 64.5° 66.6 33.9 3.5 44.8 4.3 13.1 127.7 76.0 49.5 63.9 5.0

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