Trek Rail 9.9 XX1 AXS Gen 4
Details
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.
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 XX1 AXS drivetrain. 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. RockShox's best enduro fork, Bosch's biggest battery, the smooth shifting of XX1 AXS, an updated frame, and AirWiz pressure monitoring, plus Bosch's latest tech with smart system.
Why you'll love it
- 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
- Intelligent eMTB and eMTB Lite modes automatically adjust the assist based on your input to give you just the right amount of power for your ride
- 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 number | 15.5" | 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 |
| Size | Rider Height | Inseam |
|---|---|---|
| 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" |
Specs
| 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 Ultimate RT, 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, SRAM XD driver, 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 | SRAM X-SYNC 2, 34T, alloy |
| Shifters | SRAM Eagle AXS, wireless, 12 speed |
| Rear Derailleur | SRAM XX1 Eagle AXS |
| Cassette/Freewheel | SRAM Eagle XG-1299, 10-52, 12 speed |
| Chain | SRAM XX1 Eagle, 12 speed |
| Brakes | SRAM Code RSC 4-piston hydraulic disc |
| Rotors |
Size: S, M, L, XL SRAM 6-bolt, 200mm Size: S, M, L, XL SRAM HS2, 6-bolt, 220mm |
| 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 RockShox Reverb AXS, 100mm travel, wireless, 34.9mm, 340mm length Size: M RockShox Reverb AXS, 150mm travel, wireless, 34.9mm, 440mm length Size: L, XL RockShox Reverb AXS, 170mm travel, wireless, 34.9mm, 480mm length |
| Saddle | Bontrager Arvada, austenite rails, 138mm width |
| Pedals | Wellgo VPE-536 |
| 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) |
| 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, SRAM AXS aux power cable |
| Charger | Bosch standard 4A, 110V, smart system |
* Subject to change without notice.
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