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It's right for you if...
You want to ride your heart out on a lightweight e-MTB that rips singletrack just like a regular XC bike, but can give you an unobtrusive boost when you want one. You also want an amazing parts spec, filled with carbon and cutting-edge tech like a fully wireless electronic drive train and our IsoStrut shock.
The tech you get
A lightweight, full OCLV Mountain Carbon frame with 60 mm of travel, a 120 mm RockShox SID Ultimate fork with Charger Race Day damper, remote lockout and Trek's exclusive lightweight IsoStrut FOX Factory shock. A Fazua Ride Trail 50 motor and 250 Wh battery that can assist up to 20 mph (25 km/h in Europe) when it's on, and gives zero drag when it's off, plus a handlebar-mounted Fazua Ride Remote FX controller. A SRAM XX1 Eagle AXS wireless electronic drivetrain, a FOX Transfer SL dropper and Kovee XXX 30 carbon wheels.
The final word
Our top-shelf E-Caliber is light, fast and built to rip. It rides like an XC race bike – like a Supercaliber, in fact – until you decide you want a little boost to scramble up a climb or put in a few extra laps.
The Walkthrough
favorite_borderWhy you'll love it
- The SRAM XX1 Eagle AXS drive train is smart, smooth and completely wireless
- You get a helping hand from the motor on climbs and long rides, but it's a more natural-feeling assist that gives you an overall experience that's closer to riding an analogue bike than a typical e-MTB
- The drive system, including the motor, is easily removable. Just take it out, pop on the included cover, and you’ll have a standard mountain bike that weighs 2.9 kg less than before
- IsoStrut gives you just enough rear suspension for cross-country traction and comfort with less weight and more efficiency
- Pivotless seat stays save on weight and actively bend to help soak up trail chatter
Outside Magazine’s 2021 Best eMTB
‘As expected, the E-Caliber made us feel like the World Cup racers we wish we were, but the real benefit was that we were more willing to ride, rather than drive, to our favourite trails. Logging more miles in the same amount of time is a win in our book.’
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‘The heart of a cross-country racer’
‘The combination of short travel, light weight and aggressive geometry will make for a bike that opens up the joys of long trail adventures and ripping fast singletrack to a segment of riders that may not otherwise get to experience that thrill.’
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Features
Fast and efficient
Fazua's lightweight drive system adds a punch of power when you need it, but rides and feels like a traditional bike when you don't. You won't feel much drag or resistance when you turn it off or pass the max level of assist. The system is also compatible with a smartphone app to let you check battery status and customise your ride.
Smart software for the trail
The E-Caliber is equipped with intelligent Fazua software called BLACK PEPPER, which allows the motor to respond immediately as you start to pedal, delivers more power over a wider cadence range and lets you customise your user settings.
Removable drivepack
Remove the motor and drivepack to save 2.9 kg/6.4 lb on days when you don't need the boost. The included cover also turns the down tube into extra storage.
The E-Caliber has the same innovative IsoStrut rear suspension as the World Cup-winning Supercaliber. You get 60 mm of integrated rear travel – just the right amount of comfort and traction, without the weight or flex of traditional full suspension.
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Trek's mountain-specific carbon fibre is tougher carbon, with unique materials and lay-up procedures, Trek's advanced engineering, and a higher standard of testing.
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Suspension Calculator
This suspension calculator will help you optimise your suspension settings for your riding weight. Simply follow the steps to find your best set up.
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Complete Tubeless System
Tubeless Ready rims and tyres make it easy to ditch the tubes so you get better traction, fewer flats and less weight. You're ready to roll straight out of the box with the included TLR rim strips, valves and sealant.
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Carbon Care Wheel Loyalty Programme
Every set of Bontrager carbon wheels is backed by the Carbon Care Wheel Loyalty Programme. In the unlikely event that you damage your Bontrager carbon wheels within the first two years of ownership, we’ll repair or replace them for free.
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Knock Block
Knock Block has your frame's back when things go wrong. It prevents your handlebars from spinning all the way around in a crash, so your hoses won't get yanked and your controls won't hit the top tube.
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Rapid Drive 108 rear hub
With 108 points of engagement, Rapid Drive gives you nearly instant acceleration instead of a clunky lag when you step on the pedals. You get smooth, immediate power to blast out of corners and hammer through the rough stuff. And that extra pedal ratchet adds control that can make all the difference when tackling a tricky climb.
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 | OCLV Mountain Carbon main frame and stays, IsoStrut, tapered head tube, Knock Block, Control Freak internal routing, Boost148, 60 mm travel |
|---|---|
| Fork | RockShox SID Ultimate, DebonAir spring, Charger Race Day damper, remote lockout, tapered steerer, 44 mm offset, Boost110, 15 mm Maxle Stealth, 120 mm travel |
| Shock | Trek IsoStrut, Fox Factory shock, air spring, DPS 2-position remote damper, Kashima Coat, 235x32.5 mm |
| Max compatible fork travel | 120mm (531mm axle-to-crown) |
| Wheel front | Bontrager Kovee XXX, OCLV Mountain Carbon, Tubeless Ready, CenterLock, Boost110, 15 mm thru axle |
|---|---|
| Wheel rear | Bontrager Kovee XXX, OCLV Mountain Carbon, Tubeless Ready, DT Swiss 54T engagement, CenterLock, SRAM XD driver, Boost148, 12 mm thru axle |
| Skewer rear | Bontrager Switch thru axle, removable lever |
| Tyre | Bontrager XR3 Team Issue, Tubeless Ready, Inner Strength sidewall, aramid bead, 120 tpi, 29x2.40" |
| Tyre part | Bontrager TLR sealant, 180 ml/6 oz |
| Max tyre size | Frame: 29x2.40" Fork: See manufacturer |
| Shifter | SRAM Eagle AXS, wireless, 12-speed |
|---|---|
| Rear derailleur | SRAM XX1 Eagle AXS |
| *Crank arm |
Size:
S , M , L E*thirteen E*spec Race Carbon, 32T, 170 mm length |
|
Size:
XL E*thirteen E*spec Race Carbon, 32T, 175 mm length |
|
| Cassette | SRAM Eagle XG-1299, 10-52, 12-speed |
| Chain | SRAM XX1 Eagle, 12-speed |
| Max. chainring size | 32T with 52mm chainline, 36T with 55mm chainline |
| Saddle | Bontrager P3 Verse Pro, carbon rails, 145 mm width |
|---|---|
| Seatpost | Fox Transfer SL, 100 mm travel, internal routing, 31.6 mm |
| Handlebar | Bontrager Line Pro, OCLV Carbon, 35 mm, 15 mm rise, 750 mm width |
| Grips | ESI Chunky |
| *Stem |
Size:
S , M Bontrager Kovee Pro, 35 mm, Knock Block, Blendr-compatible, 13-degree, 60 mm length |
|
Size:
L , XL Bontrager Kovee Pro, 35 mm, Knock Block, Blendr-compatible, 13-degree, 70 mm length |
|
| Head set | Knock Block Integrated, 62-degree radius, cartridge bearing, 1-1/8'' top, 1.5'' bottom |
| Brake | SRAM G2 Ultimate hydraulic disc, carbon levers |
| *Brake rotor |
Size:
S , M , L , XL SRAM CentreLine, CentreLock, round edge, 180 mm |
|
Size:
S , M , L , XL SRAM Centreline, CentreLock, round edge, 200 mm |
| E-bike system | Fazua Ride Trail 50 motor |
|---|---|
| Battery | Fazua Evation battery, 250 Wh |
| Charger | Fazua Evation charger, 220-240V |
| Controller | Fazua Remote bX |
| Weight | M - 36.05 lbs / 16.35 kg (with TLR sealant, no tubes) |
|---|---|
| Weight limit | This bike has a maximum total weight limit (combined weight of bicycle, rider and cargo) of 136 kg (300 lb). |
Sizing & Tech
The charts below show our recommended sizes based on height, but there are some other factors, like arm and leg length, that determine a great fit. That’s why you’ll see some overlap in our recommendations. Not every rider who’s 5´8˝, for example, will fit on the same size bike. The best way to find your perfect fit is to consult the experts at your local retailer.
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 letter | Actual frame size | Wheel size | A — Seat tube | B — 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| S | 15.5 | 29" | 39.4 | 72.3° | 9.0 | 67.5° | 58.0 | 32.3 | 5.0 | 44.7 | 4.2 | 10.9 | 112.6 | 76.8 | 40.5 | 60.9 |
| M | 17.5 | 29" | 41.9 | 72.6° | 10.0 | 67.5° | 61.7 | 32.3 | 5.0 | 44.7 | 4.2 | 10.9 | 116.5 | 76.8 | 44.0 | 61.8 |
| L | 19.5 | 29" | 47.0 | 72.8° | 10.5 | 67.5° | 64.8 | 32.3 | 5.0 | 44.7 | 4.2 | 10.9 | 119.7 | 76.8 | 47.0 | 62.2 |
| XL | 21.5 | 29" | 50.8 | 72.8° | 11.0 | 67.5° | 67.0 | 32.3 | 5.0 | 44.7 | 4.2 | 10.9 | 121.9 | 76.8 | 49.0 | 62.7 |