Brake rotor size also gets a bump up from the Supercaliber with a 180mm direct post mount being standard with bikes having the clearance to run a 203mm rotor. In our experience, Trek is historically cautious with this number so riders can likely run an even larger width tire than advertised, they'll just have to check fitment. Tire clearance on the E-Caliber is a generous 2.4', up from the claimed and more conservative 2.2' on the Supercaliber. All of the modes are completely tunable through Fazua's app and there are sub 'eco' modes to each of the mode settings which can help even more fine-tune range and power. Additionally, there is Bluetooth LE connectivity for connecting to phones or a bike computer. The modes are Breeze- a gentle constant 100 watts, compared to a strong tailwind, River- a more progressive and sporty mode for extra strength and support which tops out at 210 watts, and Rocket- an aggressive power for going up steeper sections of trail with moderate driver power, which tops out at 250 watts. There's an LED battery indicator along with a 'rain mode' which can disable the touch interface making the mechanical button the sole control. The remote is smaller and more ergonomic than Fazua's previous model and the system can be turned on from the remote.

There are three separate modes on the remote. Their new 'Black Pepper' tune is said to give better assistance at higher cadences along with more differentiation between the three assist modes, a more responsive start, and the ability for riders to customize the support modes. The Fazua system is tuned specifically for mountain biking.

Complete bikes weigh between 34-40 lbs, depending on build. This drops about 6lbs or 2.7kg off the total bike weight, giving riders the option of riding it as an XC bike without the heft of the complete eMTB system, with a huge portal for storing food and snacks. The bike can be ridden without the electric assist and the battery can be removed and replaced with an included cover. This is powered by a 250 watt-hour battery giving the bike a range that Trek's team claims to be in the 30-80km range - a huge variance, but it depends on terrain and rider weight and riding style. The E-Caliber uses Fazua's Evation drive system to deliver 55Nm of torque.

E calibre