The brand new Trek Rail replaces the Powerfly. With the flagship Rail 9.9, Trek have finally put more focus on trail performance than long-distance comfort. Does it ride as if it’s on rails?

Click here for an overview of the best eMTB 2020 group test.

Trek Rail 9.9 | Bosch Performance Line CX/625 Wh | 160/150 mm (f/r) | 22.00 kg (size L) | € 10,999 | manfacturer website

The Rail 9.9 is distinctly recognisable as a Trek. The beautiful, high-quality carbon frame with 29″ wheels is very similar to the non-motorised Slash, also offering 160 mm travel up front and 150 mm at the rear. Trek have integrated the current Bosch Performance Line CX motor, which can generate 75 Nm torque, nicely into the frame, and it is powered by an equally well integrated 625 Wh battery. The battery can be removed from the side of the down tube within seconds and is easy to carry thanks to the convenient handle. The Kiox display is elegantly mounted on the top tube of the Rail 9.9, though unfortunately, the lower end models have to make do without it. Only the cable routing along the frame to the display disrupts the very clean look.

Components, weight and technical details of the Trek Rail 9.9

In addition to the in-house Bontrager carbon cockpit, the € 10,999 flagship Trek Rail 9.9 comes with SE5 Team Issue tires and Bontrager Line Pro carbon wheels. Unfortunately, the rear rim broke during our tests, but thanks to the Bontrager Carbon Care program, you’ll get replacements for up to two years after your purchase. Apart from the Shimano XT 4-piston brake, Trek rely on the know-how of SRAM and RockShox. Neither the wireless X01 AXS drivetrain or the Reverb AXS dropper post are the real highlight here. Instead, it’s the RockShox Deluxe RT3 RE:aktiv Thru Shaft shock. Specially designed for Trek Bikes, the shock has fewer seals and makes for super responsive rear suspension on the Rail 9.9.

One of many
When carbon rims get damaged they become unusable. While an aluminium rim would likely just have been dented, the rim of the Line Carbon 30 wheelset can go in the trash.
In the past, we often criticised the Knock Block. With increasingly large batteries in the down tube, steering limiters have become a necessity on many bikes to protect the frame from the fork crown.
Side loader
The 625 Wh battery is very easy to remove from the side of the down tube. A locking pin and carrying handle ensure comfort and safety.

Trek Rail 9.9

€ 10,999


Motor Bosch Performance Line CX 75Nm
Battery Bosch PowerTube 625Wh
Display Bosch Kiox
Fork RockShox Lyrik Ultimate 160 mm
Rear Shock RockShox Deluxe RT3 RE:aktiv Thru Shaft 150 mm
Seatpost RockShox Reverb AXS 150 mm
Brakes Shimano XT 4-piston 200/200 mm
Drivetrain SRAM X01 Eagle AXS 1x12
Stem Bontrager Line Pro 50 mm
Handlebar Bontrager Line Pro Carbon 780 mm
Wheelset Bontrager Line Carbon 30 29"

Technical Data

Size S M L XL
Weight 22 kg
Perm. total weight 136 kg
Max. payload (rider/equipment) 114 kg
Trailer approval no
Kickstand mount yes

Specific Features

individual Project One paintwork available for additional charge

Best location
The magnetic cover and the position of the charging socket prevent it from getting dirty and it’s also easy to reach.
Our heels rubbed on the wide seat stays. We only left some small scuff marks but over time the paint will start coming off.
Top and flop
Trek have cleverly placed the KIOX display on the top tube which also reduces the usual cable clutter on the handlebar. However, the cable routing from the motor to the display doesn’t fit into the picture at all.

Geometry and size of the Trek

Although the Rail looks similar to Trek’s old enduro bike, the Slash, its geometry is much more modern. With a reach of 465 mm, the Rail is positioned in the middle of the test field. The bottom bracket, on the other hand, is very low with a 35 mm drop.

Size S M L XL
Seat tube 410 mm 420 mm 450 mm 500 mm
Top tube 587 mm 611 mm 633 mm 665 mm
Head tube 105 mm 105 mm 110 mm 120 mm
Head angle 64.9° 64.9° 64.9° 64.9°
Seat angle 75.0° 75.0° 75.0° 75.0°
Chainstays 447 mm 447 mm 447 mm 447 mm
BB Height 344 mm 344 mm 344 mm 344 mm
BB Drop 29 mm 29 mm 29 mm 29 mm
Wheelbase 1,195 mm 1,220 mm 1,243 mm 1,277 mm
Reach 425 mm 450 mm 470 mm 499 mm
Stack 623 mm 622 mm 627 mm 636 mm
Helmet Sweet Protection Bushwhacker II Carbon MIPS | Glasses Oakley Wind Jacket 2.0 | Backpack AMPLIFI E-Track | Shirt LEiWAND Longsleeve Reisenberg | Shorts LEiWAND Anninger

The Trek Rail 9.9 on the trail

The striking kink in the seat tube is another typical Trek design feature. Because of it, the effective seat tube angle of the Rail gets slacker the more you extend the seat post. If you’ve got long legs, this will place you further over the rear wheel than smaller riders. On steep climbs, taller riders, in particular, have to actively weight the front wheel to keep it on the ground. Keep the front down and you’ll benefit from the Rail 9.9’s low weight of just 22 kg and easily get up the climbs. Because of the low bottom bracket, you have to time your pedal strokes as you traverse obstacles to avoid clipping your pedals.

The Trek Rail 9.9 can take on any trail: Smooth and flowing, with jumps, through roots and rocks or steep and fast. Choose anything!

Thanks to the flip-chip, the geometry of the Rail 9.9 can be adjusted to suit your preference. Since, like us, the Rail is all about the descents, we kept it in the “low” setting throughout our test. In that setting, the rider’s centre of gravity is positioned nice and low on the Trek Rail and thanks to the long front triangle, you still have plenty of room to move around. Besides the low weight, we were especially impressed by the suspension performance of the Trek Rail 9.9. It simply swallows up holes, rocks and roots whether you’re riding fast or slow without ever giving up too much of its travel. As a result, the handling feels direct even on flowing sections of track, you can get it airborne without much effort and it invites you to pull manuals – though it requires speed to do so. On very flat terrain, the weight distribution on the Rail 9.9 is less well-balanced and you have to actively shift your weight forward to have enough precision and grip in the corners. In summary, active and experienced riders will benefit most from the bike’s direct handling and its high-speed capabilities. The only thing you might not like are the wide and undefined 2.6″ Bontrager SE5 tires.

The Trek Rail 9.9 is composed, yet playful – as long as you’re carrying speed!

Tuning tip: narrower tires for even more direct handling | aluminium rims

Riding Characteristics



  1. sluggish
  2. playful


  1. nervous
  2. stable


  1. demanding
  2. balanced

Riding fun

  1. boring
  2. lively

Motor feeling

  1. digital
  2. natural

Motor power

  1. weak
  2. strong

Value for money

  1. poor
  2. top


Forest road


Flow trail uphill


Flow trail downhill


Technical single trail uphill


Technical single trail downhill


Downhill tracks



At high speed, the Trek Rail 9.9 does indeed glide over super rough terrain as if on rails. Active and fast riders can push their limits on any trail without the Rail 9.9 nearing its own. The design is beautiful and Trek have done a great job of integrating the Bosch system into the bike.


  • almost limitless capabilities on the trail
  • it looks great
  • integration of the Bosch system


  • bored at slower speeds
  • flimsy carbon wheelset
  • slack seat tube angle when the seat post is extended

You can find out more about the Trek Rail 9.9 at

The test field

You can find everything you need to know about our test for the best eMTB of 2020 right here!

All bikes in test: BULLS SONIC EVO AM 6 | Cannondale Moterra 1 | Canyon Spectral:ON 9.0 | COMMENCAL META POWER 29 TEAM 2020 | CONWAY XYRON 927 Carbon | CUBE Stereo Hybrid 160 HPC | FANTIC XF1 180 Race | FOCUS JAM² 9.9 DRIFTER | Giant Reign E+ 0 Pro | Haibike XDURO Nduro 10.0 | Liteville 301 CE MK1 | MERIDA eONE-SIXTY 10K | Moustache Samedi 27 Trail | Norco Range VLT C1 | NOX Hybrid Enduro 7.1 | Orbea WILD FS M-LTD | Pivot Shuttle 29 | Rocky Mountain Altitude Powerplay Carbon 90 Rally Edition | ROTWILD R.X750 ULTRA | SIMPLON Rapcon Pmax | Specialized Turbo Kenevo Expert | Specialized S-Works Turbo Levo | Trek Rail 9.9 | Whyte E-180 RS V1 | YT DECOY CF Pro Race

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Words: Felix Stix, Robin Schmitt, Jonas Müssig Photos: Finlay Anderson, Robin Schmitt, Felix Stix, Markus Frühmann