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Electric Full Suspension MTB
Trek Rail 9.9 CXR Gen 4
SKU5304853
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.
OVERVIEW
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.
SPECS
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E-system is certified by an accredited testing laboratory as compliant with UL 2849.
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*Please note - spec applies to all sizes unless listed separately
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| Frameset | |
| 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
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| 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
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| Shock |
RockShox Super Deluxe Thru Shaft, AirWiz, 230mm x 57.5mm
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| Max compatible fork travel |
170mm (580mm axle-to-crown)
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| Wheels | |
| Wheel front |
Bontrager Line Pro 30, OCLV Mountain Carbon, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle, 29''
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| Wheel rear |
Bontrager Line Pro 30, OCLV Mountain Carbon, Tubeless Ready, Rapid Drive 108, 6-bolt, Shimano MicroSpline freehub, Boost148, 12mm thru axle, 29''
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| Skewer rear |
Bontrager Switch thru axle, removable lever
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*Tire
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Size: S, M, L, XL
Bontrager SE5 Team Issue, Tubeless Ready, Core Strength sidewalls, aramid bead, 120 tpi, 29x2.50'' |
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Size: S, M, L, XL
Bontrager SE6 Team Issue, Tubeless Ready, Core Strength sidewalls, aramid bead, 120 tpi, 29x2.50'' |
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*Tire part
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Size: S, M, L, XL
Bontrager TLR sealant, 6oz |
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Size: S, M, L, XL
Quarq TyreWiz tire pressure monitors |
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| Rim strip | Bontrager TLR |
| E-system | |
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*Battery
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Size: S
Bosch PowerTube 625Wh, smart system |
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Size: M, L, XL
Bosch PowerTube 750Wh, smart system |
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| Charger |
Bosch standard 4A, 110V, smart system
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*Controller
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Size: S, M, L, XL
Bosch System Controller BRC3100, smart system |
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Size: S, M, L, XL
Bosch Mini Remote BRC3300, smart system, 22.2mm |
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| 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)
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| Drivetrain | |
| Shifter |
Shimano XTR M9100, 12 speed
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| Rear derailleur |
Shimano XTR M9100, Shadow Plus, long cage, 51T max cog
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| Crank |
E*thirteen E*spec Race carbon, 34T, 165mm length
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| Chainring |
E*thirteen E*spec, 34T alloy, 55mm chainline
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| Cassette |
Shimano XTR M9101, 10-51, 12 speed
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| Chain |
Shimano Dura-Ace/XTR M9100, 12 speed
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| Pedal |
VP-536 nylon platform
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| Components | |
| Saddle |
Bontrager Arvada, austenite rails, 138mm width
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*Seatpost
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Size: S
Bontrager Line Elite Dropper, 100mm travel, MaxFlow, internal routing, 34.9mm, 345mm length |
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Size: M
Bontrager Line Elite Dropper, 150mm travel, MaxFlow, internal routing, 34.9mm, 440mm length |
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Size: L
Bontrager Line Elite Dropper, 170mm travel, MaxFlow, internal routing, 34.9mm, 485mm length |
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Size: XL
Bontrager Line Elite Dropper, 200mm travel, MaxFlow, internal routing, 34.9mm, 550mm length |
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| Handlebar |
Bontrager Line Pro, OCLV Carbon, 35mm, 27.5mm rise, 780mm width
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| Grips |
Bontrager XR Trail Elite, nylon lock-on
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| Stem |
Bontrager Line Pro, 35mm, Blendr compatible, 0 degree, 45mm length
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| Brake |
Shimano XTR M9120 4-piston hydraulic disc
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| Brake rotor |
Shimano RT86, 6-bolt, 203mm
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| Rotor size |
Max brake rotor sizes - Frame: 200mm, Fork: see fork manufacturer
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| Weight | |
| Weight |
M - 22.45 kg / 49.5 lbs (with TLR sealant, no tubes)
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| Weight limit |
This bike has a maximum total weight limit (combined weight of bicycle, rider, and cargo) of 300 pounds (136 kg).
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We reserve the right to make changes to the product information contained on this site at any time without notice, including with respect to equipment, specifications, models, colors, materials, and pricing. Due to supply chain issues, compatible parts may be substituted at any time without notice. Prices shown are manufacturer's suggested retail prices.
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Bike and frame weights are based off pre-production painted frames at time of publication. Weights may vary in final production.
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SIZING GUIDE AND GEOMETRY
| Size | Rider Height | Inseam |
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| S |
155 - 165 cm 5'1" - 5'5" |
74 - 78 cm 29" - 31" |
| M |
165 - 176 cm 5'5" - 5'9" |
79 - 83 cm 31" - 33" |
| L |
177 - 188 cm 5'10" - 6'2" |
84 - 89 cm 33" - 35" |
| XL |
188 - 195 cm 6'2" - 6'5" |
89 - 91 cm 35" - 36" |
All measurements provided in cm unless otherwise noted.
| Frame size number | 15.5" | 15.5" | 17.5" | 17.5" | 19.5" | 19.5" | 21.5" | 21.5" |
| Frame size letter | S | S | M | M | L | L | XL | XL |
| 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 |