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It's right for you if...
You've seen the e-bike light and want to expand your boundaries. Like us, you believe nothing should stand between you and your next great ride, including big climbs, headwinds, rugged trails you wouldn't otherwise be able to explore.
The tech you get
A lightweight and durable Alpha Platinum Aluminum frame that fully encases a 500Wh battery for sleek looks and protection on the trail, a new Bosch Performance CX 250-watt motor that assists up to 20 mph, and an ergonomic Bosch Purion controller. A RockShox Recon RL fork with 120mm of travel and a SRAM SX Eagle 1x12 drivetrain.
The final word
The best Bosch mountain bike electric assist system available on a value-minded e-MTB built with durable, reliable parts. The drivetrain, suspension, and components deliver solid all-around performance, so you can commute to the trailhead and then spend all day riding.
The Walkthrough
favorite_borderWhy you'll love it
- The new, better-than-ever Bosch motor is smaller, lighter, and more efficient. It feels more natural while you’re pedaling, and has less drag when you’re not
- Trek's Removable Integrated Battery (RIB) system looks great and is super user-friendly: it fully hides the battery in the frame for protection, makes it easy remove the battery without tools and lets you mount a water bottle cage
- The Purion controller has Walk Assist and an intelligent eMTB mode that automatically delivers the right amount of power based on your terrain
- It's equipped with an external charging port for easy charging on or off the bike
- The size S frame features a curved top tube that makes standing over the bike easier. Plus, Smart Wheel Sizing means you'll get the fastest wheel that fits—29˝ wheels on larger frames, 27.5˝ wheels on smaller frames
Features
Will my bike have a curved top tube?
Smaller frames (S) have a top tube that dips down as it approaches the seat tube. This design makes for a lower standover height, which is good for shorter riders because it allows them to straddle their bike more easily. The larger frames (M and ML) have a straight top tube because taller riders with longer legs typically don’t have the same issues with standover height.
New Bosch Performance Line CX
The all-new Bosch Performance Line CX motor is lighter, smaller and quieter than previous versions, for cleaner integration and more nimble handling. It’s also more efficient so you can go further on a single battery charge. Use the intelligent eMTB mode to automatically adjust the amount of assist to match the terrain. It’s a set-and-forget mode that delivers just the right amount of power so you can focus on enjoying the ride.
RIB is a one-piece battery and cover with a built-in handle that can easily be removed and re-installed in the frame with no tools and no hassle. It’s the most convenient way to remove your battery for transport, security or just easier charging.
To see how far you can ride your electric mountain bike on a single charge, check out Bosch’s range calculator. We’ve auto-filled the variables for this bike model and the average rider, but you can make adjustments to get your most accurate estimate.
Calculate your range
Rack mounts
Going for a long ride? Rack mounts make carrying accessories a breeze.
Smart Wheel Size
The right wheel size paired with your frame size gives you the perfect combination of responsiveness and control.
Lighting ready
The bike is already internally wired to accept additional lights. Go to your dealer and simply have them attached to the bike and plug them in.
Motor Armor
This unique protection shield is lightweight yet robust, and protects the motor from rocks, logs and other trail debris.
Boost148/110
Wider dropouts (110mm front, 148mm rear) give you the stiffness of a 27.5" wheel with all the benefits of a 29" wheel, and Boost148 at the back lets you run wider tyres and a larger chain ring without affecting q-factor and pedalling efficiency.
Specifications
*spec applies to all sizes unless otherwise noted
| Frame | Alpha Platinum Aluminium, Removable Integrated Battery (RIB), tapered head tube, Control Freak internal routing, Motor Armor, Boost148 |
|---|---|
| *Fork |
Size:
S RockShox Recon RL, Solo Air spring, Motion Control damper, e-MTB optimised, tapered steerer, 46mm offset, Boost110, 15 mm Maxle Stealth, 120 mm travel |
|
Size:
M , L , XL RockShox Recon RL, Solo Air spring, Motion Control damper, e-MTB optimized, tapered steerer, 42 mm offset, Boost110, 15 mm Maxle Stealth, 120 mm travel |
|
| Max compatible fork travel | 120mm (XS & S: 100mm) |
| Hub front | Bontrager sealed bearing, alloy axle, 6-bolt, Boost110, 15 mm thru axle |
|---|---|
| Hub rear | Bontrager alloy, sealed bearing, alloy axle, 6-bolt, Shimano 8/9/10 freehub, Boost148, 12 mm thru axle |
| Skewer rear | Bontrager Switch thru-axle, removable lever |
| Rim | Bontrager Kovee, double-wall, Tubeless Ready, 28-hole, 23 mm width, Presta valve |
| Spokes | DT Swiss 14g, black |
| *Tyre |
Size:
S Bontrager XR3 Comp, wire bead, 30 tpi, 27.5x2.35" |
|
Size:
M , L , XL Bontrager XR3 Comp, wire bead, 30 tpi, 29x2.30" |
|
| Max tyre size | 29x2.60" or 27.5x2.8" (XS & S: 27.5x2.60") |
| Shifter | SRAM SX Eagle single-click, 12-speed |
|---|---|
| Rear derailleur | SRAM SX Eagle |
| Crank | SRAM X1 1000, 34T, 165 mm length |
| Cassette | SRAM PG-1210 Eagle, 11-50, 12-speed |
| Chain | SRAM SX Eagle, 12-speed |
| Pedal | VP-536 nylon platform |
| Saddle | Bontrager Commuter Comp |
|---|---|
| *Seatpost |
Size:
S Bontrager alloy, 31.6 mm, 12 mm offset, 330 mm length |
|
Size:
M Bontrager alloy, 31.6 mm, 12 mm offset, 360 mm length |
|
|
Size:
L , XL Bontrager alloy, 31.6 mm, 12 mm offset, 400 mm length |
|
| *Handlebar |
Size:
S Bontrager alloy, 31.8 mm, 15 mm rise, 720 mm width |
|
Size:
M , L , XL Bontrager alloy, 31.8 mm, 15 mm rise, 750 mm width |
|
| Grips | Bontrager XR Endurance Comp |
| *Stem |
Size:
S , M Bontrager alloy, 31.8 mm, Blendr-compatible, 7-degree, 60 mm length |
|
Size:
L , XL Bontrager alloy, 31.8 mm, Blendr-compatible, 7-degree, 70 mm length |
|
| Head set | FSA IS-2, 1-1/8" top, 1.5" bottom |
| Brake | Tektro HD-M275 hydraulic disc |
| Brake rotor | Tektro, 6-bolt, 203 mm |
| Battery | Bosch PowerTube 500 |
|---|---|
| Charger | Bosch compact 2A (100-240 V) charger |
| Controller | Bosch Purion |
| Motor | Bosch Performance CX, magnesium motor body, 250 watt, 85 Nm, 25 km/h (15.5 mph) max assist, 32 km/h for New Zealand |
| Weight | M - 23.00 kg / 50.70 lbs (with tubes) |
|---|---|
| Weight limit | This bike has a maximum total weight limit (combined weight of bicycle, rider and cargo) of 136 kg (300 lb). |
Sizing & fit
Proper bike fit is essential for best performance and comfort. Any size and geometry measurements shown on trekbikes.com are for general comparison purposes only. To find your perfect fit, visit an authorised retailer, where an expert skilled at sizing will help you find the appropriate bike and size for your individual needs.
Rider Height
Inseam
S
153.0 - 166.5 cm
5'0.2" - 5'5.6"
72.0 - 79.0 cm
28.3" - 31.1"
M
161.0 - 175.0 cm
5'3.4" - 5'8.9"
76.0 - 82.0 cm
29.9" - 32.3"
L
174.0 - 188.0 cm
5'8.5" - 6'2.0"
82.0 - 88.0 cm
32.3" - 34.6"
XL
186.0 - 196.0 cm
6'1.2" - 6'5.2"
87.0 - 92.0 cm
34.3" - 36.2"
All measurements provided in cm unless otherwise stated.
| Frame size number | Frame size letter | Wheel size | A — Seat tube | Effective seat tube angle | C — Head tube length | D — Head angle | E — Effective top tube | F — Bottom bracket height | G — Bottom bracket drop | H — Chainstay length | I — Offset | J — Trail | K — Wheelbase | L — Standover | M — Frame reach | N — Frame stack | Stem length |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 15.5 | S | 27.5" | 39.4 | 71.5° | 13 | 67.6° | 59.8 | 30.7 | 4.9 | 45.5 | 4.2 | 10.1 | 112.5 | 72.1 | 39 | 62.3 | 5 |
| 17.5 | M | 29" | 41.9 | 71.7° | 13 | 67.7° | 61.7 | 32.4 | 4.9 | 45.5 | 5.1 | 9.8 | 115.5 | 79.4 | 40.6 | 63.9 | 6 |
| 19.5 | L | 29" | 47 | 71.7° | 14 | 67.7° | 64.1 | 32.4 | 5 | 45.5 | 5.1 | 9.8 | 118 | 81.6 | 42.7 | 64.8 | 7 |
| 21.5 | XL | 29" | 52.1 | 71.7° | 16 | 67.7° | 67.2 | 32.4 | 5 | 45.5 | 5.1 | 9.8 | 121.2 | 81.8 | 45.2 | 66.7 | 8 |