Trek Rail 9.9 XX1 AXS Gen 4
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The 2023 "Rail 9.9 XX1 AXS Gen 4" model from Trek is priced at EUR 13,999 and is a highly advanced e-mountain bike equipped with state-of-the-art technology and high-quality components. The main frame is made from OCLV Mountain Carbon and features a 1.8" lower top tube that is compatible with the Bosch System Controller. The bike is fitted with a removable integrated battery (RIB) and offers additional features such as Knock Block 2.0, guided internal cable routing and a magnesium shift lever. The maximum permissible weight is 136 kg, with a kerb weight of 23 kg.
The braking system comprises SRAM components with 6-hole brake discs and a maximum brake disc diameter option of 220 mm on both wheels. The wireless SRAM Eagle AXS shifters ensure precise 12-speed shifting. The RockShox ZEB Ultimate fork, featuring AirWiz and DebonAir suspension, offers 160 mm of travel and is specifically optimised for e-MTBs.
The crankset is an ethirteen espec Race Carbon with a crank arm length of 165 mm, whilst the cassette is a SRAM Eagle XG-1299 with a range of 10–52 teeth. The drivetrain is completed by SRAM XX1 Eagle components. The handlebars are Bontrager Line Pro made from OCLV Carbon, with a width of 780 mm and a rise of 27.5 mm. The grips are Bontrager XR Trail Elite with nylon clamps.
The bike is fitted with Bontrager SE5 and SE6 Team Issue tyres, which are tubeless-ready and feature Core Strength sidewall protection. The wheels are Bontrager Line Pro 30 made from OCLV Mountain Carbon, which are also tubeless-ready.
The saddle is a Bontrager Arvada with austenitic struts, whilst the seatpost is a wireless RockShox Reverb AXS with 170 mm of travel. At the heart of the drivetrain is the Bosch Performance Line CX motor with Smart System and a torque of 85 Nm, combined with a Bosch PowerTube 750 Wh battery. The Bosch System Controller display rounds off the technical package.
The bike’s geometry features a seat tube length of 50 mm, a top tube length of 67 mm, a head tube angle of 65 degrees and a seat tube angle of 71 degrees. The wheelbase is 131 mm, with a chainstay length of 45 mm and a standover height of 77 mm.
With these specifications, the Trek Rail 9.9 XX1 AXS Gen 4 offers an impressive combination of performance, technology and comfort, making it a first-class e-mountain bike for discerning riders.
Tests & Reviews
Equipment
| Rear brakes | SRAM, 6-hole, 200 mm // SRAM HS2, 6-hole, 220 mm Max. brake disc diameter |
| Front brakes | SRAM, 6-hole, 200 mm // SRAM HS2, 6-hole, 220 mm Max. brake disc diameter |
| Frame | OCLV Mountain Carbon main frame, 1.8" lower top tube, compatible with Bosch System Controller, Removable Integrated Battery (RIB), Knock Block 2.0, guided internal cable routing, 34.9 mm seat tube diameter, magnesium shift lever, Motor Armor, Mi |
| Shift levers | SRAM Eagle AXS, wireless, 12-speed // SRAM Eagle AXS, wireless, 12-speed |
| Fork | RockShox ZEB Ultimate, AirWiz, DebonAir spring, Charger 3 RC2 shock, tapered 1.8" oversized steerer tube, fork crown optimised for e-MTBs, 44 mm offset, Boost110, 15 mm Maxle Stealth axle, 160 mm travel |
| Crankset | e*thirteen e*spec Race Carbon, 165 mm crank arm length |
| Sprocket | SRAM Eagle XG-1299, 10–52 teeth, 12-speed |
| Drive | SRAM XX1 Eagle, 12-speed |
| Handlebar | Bontrager Line Pro, OCLV Carbon, 35 mm, 27.5 mm Rise, 780 mm width |
| Grips | Bontrager XR Trail Elite, nylon clamp |
| Stem | Bontrager Line Pro, 35 mm, Knock Block, Blendr-compatible, 0 degrees, 45 mm length |
| Saddle | Bontrager Arvada, austenitic stays, 138 mm width |
| Seatpost | RockShox Reverb AXS, 100 mm travel, wireless, 34.9 mm, 340 mm length |
| Wheelset | Bontrager Line Pro 30, OCLV Mountain Carbon, Tubeless Ready, 6-hole disc mount, Boost110, 15 mm thru-axle Bontrager Line Pro 30, OCLV Mountain Carbon, Tubeless Ready, Rapid Drive 108, 6-hole disc mount, SRAM XD freehub body, Boost148, 12 m |
| Tires | Bontrager SE5 Team Issue, Tubeless Ready, Core Strength sidewall protection, aramid bead core, 120 TPI, 29 x 2.50 // Bontrager SE6 Team Issue, Tubeless Ready, Core Strength sidewall protection, aramid bead core, 120 TPI, 29 x 2.50 |
| Pedals | VP-536, nylon platform |
| Motor manufacturer / model | Bosch Performance Line CX, Smart System, magnesium motor housing, 85 Nm |
| Display | Bosch System Controller BRC3100, Smart System |
| Battery | Bosch PowerTube 625 Wh, Smart System // SRAM eTap battery pack (with charger) |
| Battery capacity (Wh) | 625 |
| Charger | Bosch standard charger 4 A, 230 V, Smart System |