Rail 9.7 Gen 4
A 29″ carbon frame full suspension enduro e-bike with upper mid-range components.
Manufacturer Price
$7,549Weight | 54.3 lbs |
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Frame | Carbon |
Suspension | Full, 150 / 160mm |
Fork | RockShox Domain |
Shock | RockShox Deluxe Select+ |
Wheels | 29″ Aluminum |
Drivetrain | 1 × 12 |
Groupset | XT, SLX |
Motor | Bosch 600W 85Nm mid-drive |
Battery | Bosch 625Wh |
Brakes | Hydraulic Disc |
Seatpost | Dropper |
For This Bike
Oct 2023
A few years have gone by since the last Rail review. Lots has changed since then. Pete reviews the Trek Rail 9.9 X0 AXS T-Type Gen 4.
Jun 2023 · Alex Evans
Trek’s Rail is claimed to be enduro-descent ready and uses Bosch’s powerful Performance Line CX motor
Great geometry provides stability
Cornering control excellent
Suspension is supple and forgiving with plenty of support
Bosch motor
Tyre compound struggles on anything other than perfectly dry terrain
Harsh feeling ride saps confidence
Jun 2023 · Danny Milner
The last time we rode the Trek Rail we awarded it our 2021 E-Bike of the Year crown in the shop bought category. Since then we haven’t had another chance to ride one, mainly because they’ve been flying off the shop floor. Meanwhile, Trek hasn’t rested on its laurels – the front triangle has been lengthened and the extra space used to stuff in Bosch’s biggest 750Wh battery on all but the smallest frame size. So how does it perform and is it one of the best electric mountain bikes on offer? Need to know: Mino link on the seatstay/rocker interface gives high and low geometry settings – useful if you want to run a 27.5in rear wheel Knock Block steering limiter uses interlocking stem and headset spacers, while steerer tube gets oversize 1.8in taper Top tube System controller and wireless remote are available to buy aftermarket, but they should come as standard M, L, and XL frames get 750Wh battery, while S gets a 625Wh This updated Rail is called the Gen 4, but you can still buy the old Gen 3 model. It gets the smaller 625Wh battery, non-Smart System-compatible electronics and a shorter reach. Although buying the Gen 4 seems like a no-brainer, the new large frame is a really big bike, with a 490mm reach and a yawning 35mm gap to the medium. So some riders may achieve a better fit on the old Gen 3. It’s disappointing that Trek hasn’t fitted the latest Bosch System Controller (as found on the Mondraker) to the top tube. Instead you get a measly blanking plate. To enjoy the improved integration and reduced clutter you’ll have to fork out an extra £1,600 for the next model up, which seems pretty stingy. Suspension Trek claims the Rail delivers 150mm travel, but we only measured 140mm (3mm less than the last Rail we tested). However, we didn’t notice this shortcoming on the trail, mostly because the long wheelbase of the Rail gives it excellent stability at high speeds on rough ground. Where we found it wanting was in terms of grip and sensitivity. It struggled to trace smaller bumps, so not only did it lack some comfort on long rides, but it needed more effort to hold a line on off-cambers, through slow turns, and in the wet. Having said that, there’s plenty of support, so as long as we had the energy, we could ride the Rail like a runaway train. Our bike came with a RockShox Zeb in place of the advertised Domain RC. With 38mm stanchions it perfectly matches the hench proportions of the Rail frame, but it wasn’t the smoothest or most supple fork on test. In that respect there was a symbiosis between the Trek’s front and rear suspension, even if it wasn’t quite the fairytale relationship we’d hoped for. Components Trek proffers two brake specs on the Rail 9.7 – Shimano Deore or SRAM Code R, both in four-piston guise. Given the choice, we’d take the Shimano …Continue reading »
Loves to go fast
Suspension lacks finesse
Feb 2023
Bosch has spent years touting its motor/battery/display array. Now, Trek’s ultra-high-end Rail eMTB gets the signature tech.
Feb 2023
With its updated frame and bigger battery, is this the best electric mountain bike going? Read on for our Trek Rail review.
Incredible suspension performance
Hugely confidence-inspiring ride quality
Powerful & intuitive Bosch Smart System
Big battery offers big range potential
Powerful brakes
Solid wheels & tyres
Battery mount failure
Longer wheelbase has reduced agility
Seat angle could be steeper
Limited size range
May 2022
Trek’s updated 2022 Rail 9.9 represents a significant departure from the outgoing model. Visit The Loam Wolf to read our review of the tech-focused updates.
Bosch Smart System power and control
Loves to go fast
Category blending capability
Technical climbing prowess
Lengthy reach numbers are polarizing, sizing jumps
Firm suspension feel at slower speeds
Limited playfulness in tighter trails
Apr 2022 · BHowell
An excellent e-bike with a lot of electronics.
Well rounded ride
Suspension quality
Powerful Bosch motor
Seat angle could be steeper
Vulnerable Bosch controller and Kiox
Mar 2022 · Guy Kesteven
Trek’s Rail 9.9 eMTB is loaded with carbon fiber and wireless tech. Guy Kesteven explores what the pricey Bosch powered flagship is like to ride on a wet and rocky Lake District demo loop
Lightweight yet super precise full carbon frame
Extended enduro geometry
Superbly controlled suspension performance
Latest big battery Bosch Smart System
Full SRAM AXS and Wiz comms componentry
Mega money
AirWiz feels gimmicky
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 BB Standard: Bosch, Press Fit Tire Clearance: 2.6" Colors: Galactic Grey; Carbon Red Smoke |
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Fork | RockShox Domain RC, DebonAir, Motion Control damper, lockout, 1.8'' oversized tapered steerer, 44mm offset, oversized crown for eMTB, Boost110, 15mm Maxle Stealth, 160mm travel Travel: 160mm Spring Type: Air |
Shock | RockShox Deluxe Select+ RT, 230mm x 57.5mm Travel: 150mm Spring Type: Air |
Bottom Bracket | Bosch, press-fit |
Stem | Bontrager Rhythm Comp, 31.8mm, Knock Block, 0 degree, 50mm length |
Handlebar | Bontrager Comp, alloy, 31.8mm, 15mm rise, 780mm width |
Saddle | Size: S, M, L, XL, Bontrager Arvada, hollow chromoly rails, 138mm width; Size: S, M, L, XL, Bontrager Arvada, steel rails, 138mm width |
Seatpost | Size: S, TranzX JD-YSP39, 100mm travel, internal routing, 34.9mm; Size: M, TranzX JD-YSP39, 150mm travel, internal routing, 34.9mm; Size: L, XL, TranzX JD-YSP39, 170mm travel, internal routing, 34.9mm Type: Dropper |
Pedals | VP-536 nylon platform |
Grips | Bontrager XR Trail Comp, nylon lock-on |
Rear Derailleur | Shimano XT M8100, long cage |
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Crank | E*thirteen E*spec Plus, 165mm length |
Shifters | Shimano SLX M7100, 12 speed |
Cassette | Shimano SLX M7100, 10-51T, 12 speed |
Chain | Shimano SLX M7100, 12 speed |
Brakes | Shimano 4-piston hydraulic disc, M6100 lever, M6120 caliper Type: Hydraulic Disc |
Rims | Bontrager Line Comp 30, Tubeless Ready |
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Front Hub | Bontrager alloy, sealed bearing, alloy axle, 6-bolt, Boost110, 15mm thru axle |
Rear Hub | Size: S, M, L, XL, Bontrager alloy, sealed bearing, 6-bolt, Rapid Drive 108, Shimano MicroSpline freehub, Boost148, 12mm thru axle; Size: S, M, L, XL, Bontrager alloy, sealed bearing, 6-bolt, Shimano MicroSpline freehub, Boost148, 12mm thru axle |
Tires | Bontrager XR5 Team Issue, Tubeless Ready, Inner Strength casing, aramid bead, 60 tpi, 29x2.50'' |
Disc Rotors | Shimano RT76, 6-bolt, 203mm |
Motor | Bosch Performance Line CX, smart system, magnesium motor body, 85 Nm |
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Battery | Size: S, Bosch PowerTube 625Wh, smart system; Size: M, L, XL, Bosch PowerTube 750Wh, smart system Recycling Program: ♻️ Call2Recycle |
Charger | Size: S, M, L, XL, Bosch standard 2A, 110V, smart system; Size: S, M, L, XL, Bosch standard 4A, 110V, smart system |
Last updated June 27
Not listed for 311 days