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 had 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 625 Wh battery, a super-responsive RockShox ZEB Ultimate fork with extra-burly 38 mm stanchions and loads of adjustability, a RockShox Super Deluxe Ultimate shock with an updated Thru Shaft damper, a Bosch Performance Line CX 250 W motor that assists up to 25 km/h and a Kiox controller. A Shimano XTR drive train and new Bontrager Line Pro 30 carbon wheels with robust SE5 Team Issue tyres that come completely tubeless-ready, including sealant.
The final word
The Rail 9.9 is all about top-shelf tech. RockShox's best enduro fork, Bosch's most powerful battery, latest motor and full-colour 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 pedalling, and has less drag when you’re not
- The full-colour 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
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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 further 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
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.
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
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
The sporty and compact on-board computer combines sleek looks and ease of use.
Connectivity only available in the US/EU
*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 Armour, Mino Link, ABP, Boost148, 12 mm thru axle, 150 mm travel|
|Fork||RockShox ZEB Ultimate, DebonAir spring, Charger 2.1 RC2 damper, e-MTB optimised crown, tapered steerer, 44 mm offset, Boost110, 15 mm Maxle Stealth, 160 mm travel|
|Shock||NEW RockShox Super Deluxe Ultimate RT3, DebonAir spring, Thru Shaft 3-position damper, 230x57.5 mm|
|Max compatible fork travel||170mm (580mm axle-to-crown)|
|Wheel front||Bontrager Line Pro 30, OCLV Mountain Carbon, Tubeless-Ready, 6-bolt, Boost110, 15 mm thru axle|
|Wheel rear||Bontrager Line Pro 30, OCLV Mountain Carbon, Tubeless Ready, Rapid Drive 108, 6-bolt, Shimano MicroSpline freehub, Boost 148, 12 mm thru axle|
|Skewer rear||Bontrager Switch thru-axle, removable lever|
|Tyre||Bontrager SE5 Team Issue, Tubeless Ready, Core Strength sidewall, aramid bead, 60 tpi, 29x2.60"|
S, M, L, XL
Bontrager TLR sealant, 180 ml/6 oz
S, M, L, XL
Quarq TyreWiz tire pressure monitors
|Rim strip||Bontrager TLR|
|Max tyre size||Frame: 29x2.60" Fork: See manufacturer|
|Shifter||Shimano XTR M9100, 12-speed|
|Rear derailleur||Shimano XTR M9100, Shadow Plus, long cage, 51-T max cog|
|Crank arm||E*thirteen E*spec Race carbon, 34T, 165 mm length|
|Cassette||Shimano XTR M9100, 10-51, 12-speed|
|Chain||Shimano Dura-Ace/XTR M9100, 12-speed|
|Pedal||VP-536 nylon platform|
|Max. chainring size||34T|
|Saddle||Bontrager Arvada, austenite rails, 138 mm width|
Bontrager Line Elite Dropper, 100 mm travel, internal routing, 31.6 mm, 340 mm length
Bontrager Line Elite Dropper, 150mm travel, internal routing, 31.6 mm, 440mm length
Bontrager Line Elite Dropper, 170mm travel, internal routing, 31.6 mm, 480mm length
|Handlebar||Bontrager Line Pro, OCLV Carbon, 35 mm, 27.5 mm rise, 780 mm width|
|Grips||Bontrager XR Trail Elite, alloy lock-on|
|Stem||Bontrager Line Pro, 35 mm, Knock Block, Blendr-compatible, 0-degree, 45 mm length|
|Head set||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, 203 mm, 6-bolt|
|Battery||Bosch PowerTube 625|
|Charger||Bosch standard 4A (220-240 V) charger|
|Controller||Bosch Kiox with Anti-theft solution|
|Motor||Bosch Performance CX, magnesium motor body, 250 watt, 85 Nm, 25 km/h (15.5 mph) max assist, 32 km/h for New Zealand|
|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 136 kg (300 lb).|
Sizing & Tech
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 stated.
|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|