Trek Rail 9.9 X0 AXS T-Type Gen 4

The 2024 "Rail 9.9 X0 AXS T-Type Gen 4" model from Trek is a state-of-the-art e-mountain bike designed for discerning riders. The price of this premium bike is 11,499 EUR. 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. Other features of the frame include the Removable Integrated Battery (RIB), the Knock Block 2.0, guided internal cable routing, a seat tube diameter of 34.9 mm, as well as a magnesium shift lever and Motor Armor.

The bike’s maximum permissible weight is 136 kg, whilst its kerb weight is 23 kg. Braking performance is provided by SRAM Code Silver 4-piston hydraulic disc brakes at both the front and rear, each with 200 mm rotors.

The drivetrain consists of the SRAM AXS POD Ultimate shifter and the SRAM X0 Eagle drivetrain, T-Type, 12-speed. The fork is a RockShox ZEB Ultimate with AirWiz, DebonAir spring and Charger 3 RC2 damper, which is specially optimised for e-MTBs and offers 160 mm of travel.

The pedals are VP-536 nylon platform pedals, and the crankset is a SRAM X0 Eagle with 34 teeth and a crank arm length of 160 mm. The cassette is an SRAM Eagle XS-1295, T-Type, with a 10–52-tooth range and is also a 12-speed cassette.

The handlebars are an integrated Bontrager RSL handlebar-stem unit, made from OCLV Carbon, with a rise of 27.5 mm and a width of 820 mm. The stem length is 45 mm with a rise of 0 degrees. The grips are Bontrager XR Trail Elite with nylon clamps.

The wheelset consists of Bontrager Line Pro 30 wheels, which are made from OCLV Mountain Carbon and are tubeless-ready. They feature a 6-bolt disc mount and Boost110 at the front and Boost148 at the rear.

The saddle is a Bontrager Arvada with austenitic struts and a width of 138 mm. The seatpost is a wireless RockShox Reverb AXS with 170 mm of travel, a diameter of 34.9 mm and a length of 480 mm.

Power is provided by a Bosch Performance Line CX motor with a torque of 85 Nm. The battery is a Bosch PowerTube with a capacity of 750 Wh, whilst the display is the Bosch System Controller BRC3100. The charger is a standard Bosch charger with an output of 4 A at 230 V.

The bike’s geometry comprises the following measurements: reach 49 mm, stack 64 mm, seat tube length 45 mm, top tube length 64 mm, head tube angle 65 degrees, seat tube angle 71 degrees, head tube length 12 mm, chainstay length 45 mm, dropout height 77 mm and wheelbase 128 mm.

In summary, the Trek Rail 9.9 X0 AXS T-Type Gen 4 offers an impressive combination of advanced technology and high-quality components, making it an outstanding e-mountain bike for discerning riders.