It’s right for you if…
You want seriously fast acceleration and the best long-travel e-MTB you can find. Components matter to you, and you want the most adjustability, smoothest performance, longest range, and most high-tech assist you can get. You love customization and want all of the cool features of Bosch’s smart system.
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 750Wh battery, ultra-adjustable RockShox ZEB Ultimate fork, RockShox Super Deluxe Ultimate Thru Shaft shock, and ultra-responsive Shimano XTR 1×12 drivetrain. Bosch’s new limited-edition Performance Line CXR motor with faster acceleration and extended boost, a new Mini Remote, and Bluetooth® System Controller display that’s integrated into the top tube.
The final word
Rail 9.9 CXR is all about power. It combines top-shelf tech with Bosch’s ultra-fast accelerating, limited-edition, Performance Line CXR motor for cruising out of corners at top speed, and their biggest battery possible to power you, lap after lap. RockShox’s best enduro fork, the super-refined shifting of XTR, an updated frame, and AirWiz pressure monitoring come together to make it the full package for e-MTB racing.
favorite_borderWhy you’ll love it
- Carbon Rail Gen 4 has the same enduro-inspired geometry and huge battery as the previous generation, but now it has a pocket in the top tube that makes Gen 4 compatible with Bosch’s integrated System Controller and Mini Remote
- Bosch’s limited-edition CXR motor gives you more power out of the gate and keeps it sustained for ripping through rock gardens when you can’t pedal
- The new System Controller shows your currently-selected assist level and remaining battery level. Its neatly integrated into the top tube for maximum protection and a sleek look
- Bosch’s new smart system gives you all the same power and responsiveness with a new discrete Mini Remote that’s streamlined with just the controls you need at your fingertips to toggle through assist levels or change to walk mode
- TyreWiz and AirWiz let you confirm your tires, fork, and shock are at the right pressure at a glance. No more getting the pump or gauge out just to check
“I like it so much that I bought one”
Watch Rob Rides EMTB put the new Rail with smart system through its paces both on and off the trail, and find out why he liked it so much that he had to have one!
“One of the best”
“Indeed the way it manages to balance big-hit compliance while still giving good pop is mighty impressive. Along with its stout chassis, long wheelbase and burly build kit, the Rail is capable of monster trucking its way down some pretty gnarly descents […] the Bosch Performance CX Line motor is another key component to the Trek Rail’s all-round performance. In our experience, this is the best full-powered motor out there.”
“Trek has really gone all out with this bike”
“My first thought about the Rail 9.9 is how it resembles a new school American muscle car, with a ton of carbon fiber and lots of digitally integrated sensors, and as always, more power than its predecessor […] If there was ever a bike that was ready for anything, the new generation of the Trek Rail 9.9 would be it.”
Best in Class winner!
It was a close competition, but not much could match the Rail on every type of terrain. The Bosch system will get you up any trail and the geometry is as close to perfect as we have found for all-around riding.
“Our e-bike of the Year”
“Rail dominates the descents and flattens the climbs…it’s every bit as potent as the Slash, but with its own built-in uplift.”
“Sets the bar”
“Whether flowing or technical, it literally glides by the competition like it’s on rails while also offering plenty of comfort for long days in the saddle.”
“One of the best all-rounders in the test. This tuxedo-looking bike symbolizes class and intention with a big win on battery life.”
Performance Line CX Race motor
The limited-edition Race motor delivers explosive acceleration, full throttle jump out of corners, and the fastest possible ride. The Performance Line CX Race Edition is the perfect choice for e-MTB racers and expert riders who want more power off of the starting line.
The System Controller gives you a quick overview of your assist mode and battery level without distracting you from the ride. It’s integrated into the top tube so it’s out of the way but still easy to see with LED indicators. It also connects to the eBike Flow app via Bluetooth for accessing ride stats and performing system updates.
RockShox AirWiz and Quarq TireWiz
TyreWiz monitors your tire 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 ride.
The new eBike Flow app turns your ride into a personalized experience. Use it to customize your motor’s assist behavior, 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.
Designed to meet the highest level of competitive mountain bike racing needs, with second to none performance and experience, Shimano XTR M9100 brings lightweight, high-end versatility to XC, enduro, and marathon racing.
This suspension calculator will help you optimize your suspension settings for your riding weight. Simply follow the steps to find your best set up.
Tubeless Ready rims and tires make it easy to ditch the tubes so you get better traction, fewer flats, and less weight. You’re ready to roll right out of the box with the included TLR rim strips, valves, and sealant.
Every set of Bontrager carbon wheels is backed by the Carbon Care Wheel Loyalty Program. 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.
Bosch PowerTube 750
Bosch’s biggest battery for your biggest rides. PowerTube 750 delivers 20% more range and a long service life.
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.
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.
Fine tune head tube angle by 1/2° and BB height by up to 10mm with the simple turn of a nut. Just flip the link to choose between slack or slacker geometry, without negatively affecting suspension performance. A Trek exclusive.