E-Caliber is Trek’s superlight e-bike

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Trek claims this to be the lightest proper e-bike you can buy (Photo: Trek)
Trek claims this to be the lightest proper e-bike you can buy (Photo: Trek)
  • Basically an evolution of Trek’s Supercaliber, but with e-power.
  • Up to 450W assistance for powering up any incline.
  • The E-Caliber 9.9 XX1 AXS weighs just 15.75kg.


The current trend with e-bikes is to find a compromise between sufficient enough range and assistance, at a weight that’s acceptable for a modern bike rack (and rider) to cope with.

This has seen brands offering multiple power options and battery packs for their range of e-bikes. Trek and its latest E-Caliber claims to be the lightest e-bike on offer.

At its absolute lightest, with an AXS 1x12 electronic drivetrain, Kovee XXX carbon wheels and RockShox’s SID ultimate 120mm fork, it weighs just 15.75kg. For comparison, that makes this new Trek e-bike only slightly heavier than a garden variety dual-suspension aluminium trail bike.

Those familiar with the Trek Supercaliber (the brand’s XCO race bike) will no doubt notice the resemblance to this E-Caliber. The rear suspension IsoStrut has been carried over with the same 60mm of travel but the fork specification has been increased from 100mm to 120mm.

Compared to the Supercaliber, Trek’s E-Caliber has 15mm more reach and the head angle has been slackened from 69° to a more trail-riding friendly 67.5°. These geometry changes should improve stability at speed and give riders more control when descending.

Trek E-Caliber
The E-Caliber battery can be removed, allowing it to be ridden like a 'normal' mountain bike (Photo: Trek)

Different modes depending on terrain and rider preference  

In order to keep the weight down, a small but potent 250Wh battery pack combines with a Fazua mid-drive motor to produce 250W, with a peak power output of 450W. The E-Caliber has 55Nm of torque is available to help pedal you up tough technical ascents.

Three ride modes are available, providing different levels of assistance. Breeze mode will deliver a constant 100W when pedalling, where River mode accesses up to 210W of the battery and motor system’s potency. The most powerful setting is Rocket mode, giving you access to 250W of assistance.

Trek has a downloadable app for your Smartphone that allows you to tap into the E-Caliber’s battery and drive pack settings, adjusting calibration. You can customize aspects like the mid-drive motor’s peak power (this is where you can access the full 450W) or the linearity of its output, perfect for the e-bike racer or advanced trail rider.

The E-Caliber’s range, much like any e-bike, is influenced by many factors: rider weight, terrain and mode choice. Trek believes that the assistance should last for up to 70km or riding and 1200m of ascent, in Breeze mode and around 60km and 1000m in River mode, which should be adequate for most riders.

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