It's right for you if...
You’re looking for a seriously capable 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
A light and durable OCLV Mountain Carbon main frame with alloy stays that fully encases a 625Wh battery for sleek looks and protection on the trail, a 160mm RockShox Lyrik Ultimate fork with Charger 2.1 RC2 damper, 150mm of rear travel with a RockShox Deluxe RT3 shock with Trek's RE:aktiv with Thru Shaft damper, a powerful new Bosch Performance Line CX 250W motor that assists up to 20 mph, and a Kiox controller. A 1x12 Shimano XTR drivetrain, Bontrager Line Elite dropper post, 4-piston brakes, a carbon handlebar, and Bontrager Line Carbon 30 29er wheels with Bontrager SE5 Team Issue tires.
The final word
Rail 9.9 is all about top performance tech. RockShox's best enduro fork, Bosch's most powerful battery, latest motor, and full-color controller. Plus, the light OCLV Mountain carbon frame is trimmed with lots of carbon parts, including the wheels and handlebar.
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 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)
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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.
Wider dropouts (110mm front, 148mm rear) give you the stiffness of a 27.5" wheel with all the benefits of a 29" wheel, and Boost148 in the rear lets you run wider tires and a larger chainring without affecting q-factor and pedaling efficiency.
*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 Lyrik Ultimate, DebonAir spring, Charger 2.1 RC2 damper, e-MTB optimized, tapered steerer, 42mm offset, Boost110, 15mm Maxle Stealth, 160mm travel|
|Shock||RockShox Deluxe RT3, DebonAir spring, RE:aktiv w/Thru Shaft damper, 230x57.5mm|
|Max compatible fork travel||170mm|
|Front wheel||Bontrager Line Carbon 30, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle|
|Rear wheel||Bontrager Line Carbon 30, Tubeless Ready, 54T Rapid Drive, 6-bolt, Shimano MicroSpline freehub, Boost148, 12mm thru axle|
|Rear hub||Bontrager alloy, sealed bearing, 6-bolt, Shimano MicroSpline freehub, Boost148, 12mm thru axle|
|Tire||Bontrager SE5 Team Issue, Tubeless Ready, Core Strength sidewall, aramid bead, 60 tpi, 29x2.60''|
S, M, L, XL
Bontrager TLR valve, 50mm
S, M, L, XL
Bontrager TLR sealant
|Max tire size||29x2.60"|
|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, 15T, 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, 0 degree, 50mm 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|
|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||M - 21.27 kg / 46.89 lbs (with tubes)|
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.
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||Stem length|