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Electric Full Suspension MTB
Trek Rail 9.9 X0 AXS T-Type Gen 4
$11,299.99
SKU5305493
Rail 9.9 is our best long-travel electric mountain bike. You get an extra-beefy carbon frame, unbelievably smooth RockShox suspension, SRAM's best wireless electronic drivetrain, and a powerful Bosch smart system Performance Line CX motor with an extra-long range battery and the new Mini Remote. The new System Controller display sits almost flush with the top tube for a sleek look wherever you roll that stays out of the way when you're riding hard.
OVERVIEW
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 customization 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 750Wh battery, ultra-adjustable RockShox ZEB Ultimate fork, RockShox Super Deluxe Ultimate Thru Shaft shock, and SRAM's wireless X0 AXS transmission. You get Bosch's smart system Performance Line CX with a new Mini Remote and Bluetooth® System Controller display that's integrated into the top tube, plus AirWiz pressure monitoring.
The final word
Rail 9.9 is all about top-shelf tech. The best enduro fork from RockShox, Bosch's biggest battery, the smooth shifting of X0 AXS, an updated frame, and AirWiz pressure monitoring, plus Bosch's latest tech with smart system.
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, SRAM XD driver, 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 |
| Max tire size |
Frame: 29x2.60", Fork: See manufacturer
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| E-system | |
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*Battery
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Size: S
Bosch PowerTube 625Wh, smart system |
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Size: S, M, L, XL
SRAM eTap battery pack (with charger) |
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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, smart system, magnesium motor body, 85 Nm
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| Drivetrain | |
| Shifter |
SRAM AXS POD Ultimate, paired with dropper
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| Rear derailleur |
SRAM X0 Eagle AXS, T-Type
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| Crank |
SRAM X0 Eagle, 160mm length
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| Chainring |
SRAM XX T-Type, 34T, steel
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| Cassette |
SRAM Eagle XS-1295, T-Type, 10-52, 12 speed
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| Chain |
SRAM X0 Eagle, T-Type, 12 speed
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| Pedal |
VP-536 nylon platform
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| Max chainring size | 1x: 34T |
| Components | |
| Saddle |
Bontrager Arvada, austenite rails, 138mm width
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*Seatpost
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Size: S
RockShox Reverb AXS, 100mm travel, wireless, 34.9mm, 340mm length |
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Size: M
RockShox Reverb AXS, 150mm travel, wireless, 34.9mm, 440mm length |
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Size: L, XL
RockShox Reverb AXS, 170mm travel, wireless, 34.9mm, 480mm length |
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| Handlebar/stem (integrated) |
Bontrager RSL Integrated handlebar/stem, OCLV Carbon, 27.5mm handlebar rise, 820mm width, 0 degree stem rise, 45mm stem length
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| Grips |
Bontrager XR Trail Elite, nylon lock-on
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| Brake |
SRAM Code Silver 4-piston hydraulic disc
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*Brake rotor
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Size: S, M, L, XL
SRAM 6-bolt, 200mm |
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Size: S, M, L, XL
SRAM HS2, 6-bolt, 220mm |
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| Rotor size |
Max brake rotor sizes - Frame: 200mm, Fork: see fork manufacturer
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| Weight | |
| Weight |
M - 23.75 kg / 52.36 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 |