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Trek Rail 9.9 CXR Gen 4

Trek Rail 9.9 CXR Gen 4
  • Color: Deep Smoke
  • Color: Lava
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This item MAY be purchased online and picked up at your convenience in any of our three retail locations. If this is a class, trip or a donation, there is no need to pick up anything.


Rail 9.9 CXR is a race-ready long-travel e-bike that's ready to go full gas right off the the starting line. It features our best carbon frame, smooth RockShox suspension, and top-tier Shimano XTR drivetrain. But the real show stealer on this powerhouse is the limited-edition Bosch Performance Line CXR motor that accelerates faster and offers sustained power for ripping through rock gardens without pedalling. It's equipped with an extra-long range battery and smart system, plus the new Mini Remote and System Controller display that sits flush with the top tube and pairs with the eBike Flow app to give you activity tracking, navigation, and Bluetooth connectivity.

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 1x12 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.

Why you'll love it
- 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
- The new frame is extra stout with a 34.9mm seat tube to accommodate more robust dropper posts, and an oversized head tube that works with burly e-MTB-optimized forks for less flex and more precise steering


All measurements provided in cm unless otherwise noted.
Frame size number15.5"15.5"17.5"17.5"19.5"19.5"21.5"21.5"
Frame size letter Small Small Medium Medium Large Large X-Large X-Large
Geometry position High Low High Low High Low High Low
Wheel size 29" 29" 29" 29" 29" 29" 29" 29"
A — Seat tube 41 41 42 42 45 45 50 50
B — Seat tube angle 71.2° 70.8° 71.2° 70.8° 71.2° 70.8° 71.2° 70.8°
Effective seat tube angle 77.1° 76.7° 77.1° 76.7° 77.1° 76.7° 77.1° 76.7°
C — Head tube length 10.5 10.5 11 11 12.5 12.5 14 14
D — Head angle 64.6° 64.2° 64.6° 64.2° 64.6° 64.2° 64.6° 64.2°
E — Effective top tube 57.9 58 60 60.1 63.8 63.9 67.1 67.3
F — Bottom bracket height 34.6 34.1 34.6 34.1 34.6 34.1 34.6 34.1
G — Bottom bracket drop 2.7 3.3 2.7 3.3 2.7 3.3 2.7 3.3
H — Chainstay length 44.7 44.8 44.7 44.8 44.7 44.8 44.7 44.8
I — Offset 4.3 4.3 4.3 4.3 4.3 4.3 4.3 4.3
J — Trail 13 13.3 13 13.3 13 13.3 13 13.3
K — Wheelbase 121.3 121.4 123.6 123.6 127.7 127.8 131.3 131.4
L — Standover 76.1 75.6 77.3 76.8 77 76.5 76.8 76.3
M — Frame reach 43.6 43.2 45.6 45.2 49.1 48.7 52.1 51.7
N — Frame stack 62.5 62.8 62.9 63.3 64.3 64.6 65.6 66
SizeRider HeightInseam
Small 155 - 165 cm
5'1" - 5'5"
74 - 78 cm
29" - 31"
Medium 165 - 176 cm
5'5" - 5'9"
79 - 83 cm
31" - 33"
Large 177 - 188 cm
5'10" - 6'2"
84 - 89 cm
33" - 35"
X-Large 188 - 195 cm
6'2" - 6'5"
89 - 91 cm
35" - 36"


Frame OCLV Mountain Carbon main frame, 1.8'' lower head tube, Bosch System Controller compatible, Removable Integrated Battery (RIB), Knock Block 2.0, guided internal routing, 34.9mm seat tube, magnesium rocker link, Motor Armor, Mino Link, ABP, Boost148, 12mm thru axle, 150mm travel
Fork RockShox ZEB Ultimate, AirWiz, DebonAir spring, Charger 3 RC2 damper, 1.8'' oversized tapered steerer, eMTB optimized crown, 44mm offset, Boost110, 15mm Maxle Stealth, 160mm travel
Rear Shock RockShox Super Deluxe Thru Shaft, AirWiz, 230mm x 57.5mm
Wheels Front: Bontrager Line Pro 30, OCLV Mountain Carbon, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle
Rear: Bontrager Line Pro 30, OCLV Mountain Carbon, Tubeless Ready, Rapid Drive 108, 6-bolt, Shimano MicroSpline freehub, Boost148, 12mm thru axle
Rims Bontrager Line Pro 30, OCLV Mountain Carbon, Tubeless Ready
Tires Size: S, M, L, XL Bontrager SE5 Team Issue, Tubeless Ready, Core Strength sidewalls, aramid bead, 120 tpi, 29x2.50''
Size: S, M, L, XL Bontrager SE6 Team Issue, Tubeless Ready, Core Strength sidewalls, aramid bead, 120 tpi, 29x2.50''
Crankset E*thirteen E*spec Race carbon, 34T, 165mm length
Chainrings E*thirteen E*spec, 34T alloy, 55mm chainline
Shifters Shimano XTR M9100, 12 speed
Rear Derailleur Shimano XTR M9100, Shadow Plus, long cage, 51T max cog
Cassette/Freewheel Shimano XTR M9101, 10-51, 12 speed
Chain Shimano Dura-Ace/XTR M9100, 12 speed
Brakes Shimano XTR M9120 4-piston hydraulic disc
Rotors Shimano RT86, 6-bolt, 203mm
Handlebars Bontrager Line Pro, OCLV Carbon, 35mm, 27.5mm rise, 780mm width
Tape/Grips Bontrager XR Trail Elite, nylon lock-on
Stem Bontrager Line Pro, 35mm, Knock Block, Blendr compatible, 0 degree, 45mm length
Seatpost Size: S Bontrager Line Elite Dropper, 100mm travel, MaxFlow, internal routing, 34.9mm, 345mm length
Size: M Bontrager Line Elite Dropper, 150mm travel, MaxFlow, internal routing, 34.9mm, 440mm length
Size: L Bontrager Line Elite Dropper, 170mm travel, MaxFlow, internal routing, 34.9mm, 485mm length
Size: XL Bontrager Line Elite Dropper, 200mm travel, MaxFlow, internal routing, 34.9mm, 550mm length
Saddle Bontrager Arvada, austenite rails, 138mm width
Pedals Wellgo VPE-536
Motor Bosch Performance Line CX Race Edition, smart system, magnesium motor body, 85 Nm, 20 mph or 32 km/h max assist (25 km/h max assist in EU and APAC)
Battery Size: S Bosch PowerTube 625Wh, smart system
Size: M, L, XL Bosch PowerTube 750Wh, smart system
Controller/Display Size: S, M, L, XL Bosch System Controller BRC3100, smart system
Size: S, M, L, XL Bosch Mini Remote BRC3300, smart system, 22.2mm
Charger Bosch standard 4A, 110V, smart system

* Subject to change without notice.


Part Numbers

Option UPC MPN Store SKU
Deep Smoke / Large 768682650967 5304855 RAI21339398E
Lava / Medium 768682650943 5304858 RAI16933979A
Lava / Large 768682650509 5304859 RAI16547903A