It's right for you if...
You’re looking for a long-travel carbon e-MTB and you want nothing but the best. Your bike better have a top-of-the-line drivetrain, 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 Shimano XTR drivetrain, 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. RockShox's best enduro fork, Bosch's most powerful battery, latest motor, and full-color controller. Plus, you get the refined and super-smooth shifting of Shimano XTR.
favorite_borderWhy you'll love it
- 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
- The full-color Bosch Kiox controller displays ride info, connects with your Bluetooth® enabled devices, and has a built-in theft prevention feature
- RE:aktiv with Thru Shaft works faster than a normal shock, so it tracks the ground better and keeps you in control
- 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
- Made with the same exclusive frame tech as Remedy and Slash, like Mino Link adjustable geometry, a Straight Shot down tube for extra stiffness, and Active Braking Pivot (ABP)
- Smaller frames (S) have a top tube that dips down as it approaches the seat tube
You might also like
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.Learn more
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.
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.
Integrated speed sensor
You've got one less detail to sweat with the integrated speed sensor. The chainstay-mounted sensor stays protected while the custom hub-mounted magnet stays secure—no more error codes from mis-aligned sensors.
Bosch Kiox display
Bosch Kiox's bright, full-color screen is easy to read in any light conditions and is protected by durable Gorilla Glass. You can view battery life, support level, speed, heart rate, and more. Plus, it seamlessly connects to your phone through the Bosch eBikeConnect app to share ride data, GPS map routes, altitude, cadence, and power output.
*spec applies to all sizes unless otherwise noted
|Frame||OCLV Mountain Carbon main frame, 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 optimzed crown, tapered steerer, 44mm offset, Boost110, 15mm Maxle Stealth, 160mm travel|
|Shock||NEW RockShox Super Deluxe Ultimate RT3, DebonAir spring, Thru Shaft 3-position damper, 230x57.5mm|
|Max compatible fork travel||170mm (580mm axle-to-crown)|
|Wheel front||NEW Bontrager Line Pro 30, OCLV Mountain Carbon, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle|
|Wheel rear||NEW Bontrager Line Pro 30, OCLV Mountain Carbon, Tubeless Ready, Rapid Drive 108, 6-bolt, Shimano MicroSpline freehub, Boost148, 12mm thru axle|
|Skewer rear||Bontrager Switch thru axle, removable lever|
|Tire||Bontrager SE5 Team Issue, Tubeless Ready, Core Strength sidewall, aramid bead, 60 tpi, 29x2.60''|
S, M, L, XL
Bontrager TLR sealant, 6oz
S, M, L, XL
Quarq TyreWiz tire pressure monitors
|Rim strip||Bontrager TLR|
|Max tire size||Frame: 29x2.60" Fork: See manufacturer|
|Shifter||Shimano XTR M9100, 12 speed|
|Rear derailleur||Shimano XTR M9100, Shadow Plus, long cage, 51T max cog|
|Crank arm||E*thirteen E*spec Race carbon, 34T, 165mm length|
|Cassette||Shimano XTR M9100, 10-51, 12 speed|
|Chain||Shimano XTR M9100, 12 speed|
|Pedal||VP-536 nylon platform|
|Max chainring size||34T|
|Saddle||Bontrager Arvada, austenite rails, 138mm width|
Bontrager Line Elite Dropper, 100mm travel, internal routing, 31.6mm, 340mm length
Bontrager Line Elite Dropper, 150mm travel, internal routing, 31.6mm, 440mm length
Bontrager Line Elite Dropper, 170mm travel, internal routing, 31.6mm, 480mm length
|Handlebar||Bontrager Line Pro, OCLV Carbon, 35mm, 27.5mm rise, 780mm width|
|Grips||Bontrager XR Trail Elite, alloy lock-on|
|Stem||Bontrager Line Pro, 35mm, Knock Block, Blendr compatible, 0 degree, 45mm length|
|Headset||Knock Block Integrated, 58-degree radius, cartridge bearing, 1-1/8'' top, 1.5'' bottom|
|Brake||Shimano XTR M9120 4-piston hydraulic disc|
|Brake rotor||Shimano RT86, 203mm, 6-bolt|
|Battery||Bosch PowerTube 625|
|Charger||Bosch standard 4A (100-240V) charger|
|Controller||Bosch Kiox with Anti-theft solution|
|Motor||Bosch Performance CX, magnesium motor body, 250 watt, 85 Nm, 20mph or 32km/h max assist|
|Weight||M - 21.71 kg / 47.86 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).|
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 retailer.
153.0 - 166.5 cm
5'0.2" - 5'5.6"
72.0 - 79.0 cm
28.3" - 31.1"
161.0 - 175.0 cm
5'3.4" - 5'8.9"
76.0 - 82.0 cm
29.9" - 32.3"
174.0 - 188.0 cm
5'8.5" - 6'2.0"
82.0 - 88.0 cm
32.3" - 34.6"
186.0 - 196.0 cm
6'1.2" - 6'5.2"
87.0 - 92.0 cm
34.3" - 36.2"
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|