It's right for you if...
You want to spare no expense on your e-MTB experience. You want the most adjustability, smoothest performance, longest range and most high-tech electric assist you can get. You love customisation and want all the cool features of the Bosch smart system, and you want wireless electronic shifting.
The tech you get
An upgraded OCLV Mountain Carbon frame with longer reach and oversized head tube and seat tube for maximum strength. An extra-long-range 750 Wh battery, ultra-adjustable RockShox ZEB Ultimate fork, RockShox Super Deluxe Ultimate Thru Shaft shock and SRAM XX1 AXS drivetrain. You get Bosch's new smart system Performance Line CX with a new Bluetooth® LED remote for easy connectivity and all-in-one navigation and activity tracking through the eBike Flow app, plus TyreWiz and AirWiz pressure monitoring.
The final word
The Rail 9.9 is all about top-shelf tech. RockShox's best enduro fork, Bosch's biggest battery, the smooth shifting of XX1 AXS, an updated frame, TyreWiz and AirWiz pressure monitoring, plus Bosch's latest tech with smart system.
favorite_borderWhy you'll love it
- Bosch's new smart system gives you all the same power and responsiveness with a new Bluetooth-connected LED remote and eBike Flow app that puts even more control and customisation at your fingertips
- TyreWiz and AirWiz let you confirm that your tyres, fork and shock are at the right pressure at a glance. No more getting the pump or gauge out just to check
- RE:aktiv with Thru Shaft works faster than a normal shock, so it tracks the ground better and keeps you in control
- The new frame is extra stout, with a 34.9 mm seat tube to accommodate more robust dropper posts, and an oversized head tube that works with burly eMTB-optimised forks for less flex and more precise steering
- 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
The new eBike Flow app turns your ride into a personalised experience. Use it to customise your motor's assist behaviour, track your ride stats and integrate your data with apps like Strava and Apple Health. There's even handy features like navigation and service reminders.
RockShox AirWiz and Quarq TireWiz
TyreWiz monitors your tyre pressure while AirWiz monitors your fork and shock pressure. Set your desired pressure in the SRAM AXS app and then just check the lights before each ride – red means you need a pump, green means go and ride.
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.
Carbon Care Wheel Loyalty Programme
Every set of Bontrager carbon wheels is backed by the Carbon Care Wheel Loyalty Programme. In the unlikely event that you damage your Bontrager carbon wheels within the first two years of ownership, we’ll repair or replace them for free.
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 300 display
The Bosch Kiox 300 is tough, compact and easy to read with a full-colour display. Keep ride data right where you can see it, including rider power, motor output, speed, remaining range and more!
Oversized 34.9mm dropper post
Bigger is better. The oversized seat tube diameter gives more support and strength for longer travel droppers, and allows for more robust, durable internals that work faster.
Bosch PowerTube 750
Bosch's biggest battery for your biggest rides. The PowerTube 750 delivers 20% more range and a long service life.
*spec applies to all sizes unless otherwise noted
|Frame||NEW OCLV Mountain Carbon main frame, 1.8" lower head tube, Removable Integrated Battery (RIB), Knock Block 2.0, guided internal routing, 34.9 mm seat tube, magnesium rocker link, Motor Armour, Mino Link, ABP, Boost148, 12 mm thru axle, 150 mm travel|
|Fork||RockShox ZEB Ultimate, AirWiz, 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||RockShox Super Deluxe Thru Shaft, AirWiz, 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, SRAM XD driver, Boost 148, 12 mm thru axle|
|Skewer rear||Bontrager Switch thru-axle, removable lever|
|Rim||Bontrager Line Pro 30, OCLV Mountain Carbon, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle|
M, L, XL
Bontrager SE5 Team Issue, Tubeless Ready, Core Strength sidewalls, aramid bead, 120 tpi, 29x2.50"
M, L, XL
Bontrager SE6 Team Issue, Tubeless Ready, Core Strength sidewalls, aramid bead, 120 tpi, 29x2.50"
M, L, XL
Bontrager TLR sealant, 180 ml/6 oz
M, L, XL
Quarq TyreWiz tire pressure monitors
|Rim strip||Bontrager TLR|
|Max tyre size||Frame: 29x2.60" Fork: See manufacturer|
|Shifter||SRAM Eagle AXS, wireless, 12-speed|
|Rear derailleur||SRAM XX1 Eagle AXS|
|Crank arm||E*thirteen E*spec Race carbon, 34T, 165 mm length|
|Cassette||SRAM Eagle XG-1299, 10-52, 12-speed|
|Chain||SRAM XX1 Eagle, 12-speed|
|Pedal||VP-536 nylon platform|
|Max. chainring size||34T|
|Saddle||Bontrager Arvada, austenite rails, 138 mm width|
RockShox Reverb AXS, 150mm travel, wireless, 34.9mm, 440mm length
RockShox Reverb AXS, 170mm travel, wireless, 34.9mm, 480mm length
|Handlebar||Bontrager Line Pro, OCLV Carbon, 35 mm, 27.5 mm rise, 780 mm width|
|Grips||Bontrager XR Trail Elite, nylon 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, 1.8'' bottom|
|Brake||SRAM Code RSC hydraulic disc|
M, L, XL
SRAM CenterLine, 6-bolt, round-edge, 180mm
M, L, XL
SRAM CenterLine, 6-bolt, round edge, 200 mm
M, L, XL
Bosch PowerTube 750 Wh, smart system
M, L, XL
SRAM eTap battery pack (with charger)
|Charger||Bosch standard 4A, 230V, smart system|
|Controller||Bosch Kiox 300, smart system|
|Motor||Bosch Performance Line CX, smart system, magnesium motor body, 85 Nm, 20 mph or 32 km/h max assist (25 km/h max assist in EU and APAC)|
|Weight||M - 22.54 kg / 49.7 lbs (with TLR sealant, no 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
Proper bike fit is essential for best performance and comfort. Any size and geometry measurements shown on trekbikes.com are for general comparison purposes only. To find your perfect fit, visit an authorised retailer, where an expert skilled at sizing will help you find the appropriate bike and size for your individual needs.
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 letter||Geometry position||Wheel size||A — Seat tube||B — Seat tube angle||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|